Wildcard Handling with Astroquery.mast

Wildcard Handling with Astroquery.mast#

Learning Goals#

By the end of this tutorial, you will:

Use the wildcards available for astroquery.mast.Observations criteria queries
Broaden and refine astroquery.mast.Observations criteria queries
Fully utilize the instrument_name criteria, especially for JWST queries
Query for moving targets using target ephemeris and time criteria such as t_min and t_max

Introduction#

This Notebook demonstrates the use of wildcards in astroquery.mast.Observations criteria queries. The use of wildcards is encouraged for certain criteria types (namely, string object types) to ensure your query returns all results.

We will demonstrate 3 use-cases for wildcards when doing criteria queries and emphasize certain criteria where wildcard usage is highly encouraged, particularly for JWST queries. We will also use the last example to demonstrate the use of value ranges when working with float object criteria types.

The workflow for this notebook consists of:

Wildcard overview with astroquery.mast.Observations
1. Wildcard Search with instrument_name
2. Wildcard Search with instrument_name and proposal_id
3. Wildcard Search a Time-sensitive Object with target_name and t_min
Resources

Imports#

import astropy.units as u
import matplotlib.pyplot as plt

from astropy.coordinates import SkyCoord
from astropy.table import Table, unique, vstack
from astropy.time import Time
from astroquery.mast import Observations

Wildcards with `astroquery.mast.Observations`#

The use of wildcards when making astroquery.mast.Observations queries can help ensure you retrieve all observations without leaving anything out. The available wildcards are % and *: % replaces a single character, while * replaces more than one character preceding, following, or in between the existing characters, depending on its placement. See the Observation Criteria Queries section in the astroquery.mast documentation for more information on the wildcards.

Wildcards are only available for certain criteria. string type objects accept wildcards, but float, integer, or any other objects do not accept wildcards.

Users may call the get_metadata method to see the list of query criteria and their data types. The criteria listed as string objects under the Data Type column are criteria that can be called with wildcards:

Observations.get_metadata("observations")

Table length=34

Column Name	Column Label	Data Type	Units	Description	Examples/Valid Values
str21	str25	str7	str10	str72	str116
intentType	Observation Type	string		Whether observation is for science or calibration.	Valid values: science, calibration
obs_collection	Mission	string		Collection	E.g. SWIFT, PS1, HST, IUE
provenance_name	Provenance Name	string		Provenance name, or source of data	E.g. TASOC, CALSTIS, PS1
instrument_name	Instrument	string		Instrument Name	E.g. WFPC2/WFC, UVOT, STIS/CCD
project	Project	string		Processing project	E.g. HST, HLA, EUVE, hlsp_legus
filters	Filters	string		Instrument filters	F469N, NUV, FUV, LOW DISP, MIRROR
wavelength_region	Waveband	string		Energy Band	EUV, XRAY, OPTICAL
target_name	Target Name	string		Target Name	Ex. COMET-67P-CHURYUMOV-GER-UPDATE
target_classification	Target Classification	string		Type of target	Ex. COMET;COMET BEING ORBITED BY THE ROSETTA SPACECRAFT;SOLAR SYSTEM
obs_id	Observation ID	string		Observation identifier, given by mission	U24Z0101T, N4QF18030
...	...	...	...	...	...
s_region	s_region	string	ICRS Shape	STC/S Footprint	Will be ICRS circle or polygon. E.g. CIRCLE ICRS 17.71740689 -58.40043015 0.625
jpegURL	jpegURL	string		Preview Image URL	https://archive.stsci.edu/hst/previews/N4QF/N4QF18090.jpg
distance	Distance (")	float	arcsec	Angular separation between searched coordinates and center of obsevation
obsid	Product Group ID	integer		Database identifier for obs_id	Long integer, e.g. 2007590987
dataRights	Data Rights	string		Data Rights	valid values: public,exclusive_access,restricted
mtFlag	Moving Target	boolean		Moving Target Flag	If True, observation contains a moving target, if False or absent observation may or may not contain a moving target
srcDen	Number of Catalog Objects	float		Number of cataloged objects found in observation
dataURL	Data URL	string		Data URL
proposal_type	Proposal Type	string		Type of telescope proposal	Eg. 3PI, GO, GO/DD, HLA, GII, AIS
sequence_number	Sequence Number	integer		Sequence number, e.g. Kepler quarter or TESS sector

Case 1: Wildcard Search with `instrument_name`#

For our first example we will search for all NIRISS observations taken by a certain proposal/program PI. Our two query criteria are proposal_pi and instrument_name, which are both string object criteria. As such, both can be wildcarded for ease of use.

In fact, it is sometimes necessary to use wildcards when searching on instrument_name. Both HST and JWST use instrument configurations in this field to allow for more precise advanced searches (e.g. NIRISS/IMAGE and STIS/FUV-MAMA). When performing a “generic” search, you must include a wildcard or these more detailed results will be excluded.

We will demonstrate this by looking at the results for the query below:

observations = Observations.query_criteria(proposal_pi="Espinoza, Nestor",
                                           instrument_name="NIRISS*")
observations

Table masked=True length=135

intentType	obs_collection	provenance_name	instrument_name	project	filters	wavelength_region	target_name	target_classification	obs_id	s_ra	s_dec	dataproduct_type	proposal_pi	calib_level	t_min	t_max	t_exptime	em_min	em_max	obs_title	t_obs_release	proposal_id	proposal_type	sequence_number	s_region	jpegURL	dataURL	dataRights	mtFlag	srcDen	obsid	objID
str7	str4	str7	str12	str4	str13	str8	str13	str54	str50	float64	float64	str8	str16	int64	float64	float64	float64	float64	float64	str70	float64	str4	str3	int64	str132	str63	str81	str16	bool	float64	str9	str9
science	JWST	CALJWST	NIRISS/IMAGE	JWST	CLEAR;GR700XD	Infrared	ECLIPTIC-RA00	Calibration; External flat field	jw04479001008_03101_00001_nis	9.344387500000002	1.4307027777777779	image	Espinoza, Nestor	2	60265.649413757754	60265.65301753472	300.63	600.0	2800.0	SOSS background measurements	60265.68196744	4479	CAL	--	POLYGON 9.325091029 1.406134446 9.309028303 1.43963309 9.342821013 1.455643805 9.35890312 1.422164529	mast:JWST/product/jw04479001008_03101_00001_nis_trapsfilled.jpg	mast:JWST/product/jw04479001008_03101_00001_nis_rateints.fits	PUBLIC	False	nan	192007020	370480998
science	JWST	CALJWST	NIRISS/IMAGE	JWST	CLEAR;GR700XD	Infrared	ECLIPTIC-RA00	Calibration; External flat field	jw04479001001_03101_00001_nis	9.344387500000002	1.4307027777777779	image	Espinoza, Nestor	2	60265.58373012349	60265.58733390046	300.63	600.0	2800.0	SOSS background measurements	60265.66748831	4479	CAL	--	POLYGON 9.350452979 1.418150502 9.334390429 1.451649271 9.368183444 1.467659722 9.384265372 1.434180319	mast:JWST/product/jw04479001001_03101_00001_nis_trapsfilled.jpg	mast:JWST/product/jw04479001001_03101_00001_nis_rateints.fits	PUBLIC	False	nan	191961743	370481010
science	JWST	CALJWST	NIRISS/IMAGE	JWST	CLEAR;GR700XD	Infrared	ECLIPTIC-RA00	Calibration; External flat field	jw04479001006_03101_00001_nis	9.344387500000002	1.4307027777777779	image	Espinoza, Nestor	2	60265.63078266979	60265.634386446756	300.63	600.0	2800.0	SOSS background measurements	60265.66760405	4479	CAL	--	POLYGON 9.337523341 1.40174698 9.321460798 1.435245697 9.355253516 1.451256258 9.371335441 1.41777691	mast:JWST/product/jw04479001006_03101_00001_nis_trapsfilled.jpg	mast:JWST/product/jw04479001006_03101_00001_nis_rateints.fits	PUBLIC	False	nan	191961741	370481023
science	JWST	CALJWST	NIRISS/IMAGE	JWST	CLEAR;GR700XD	Infrared	ECLIPTIC-RA00	Calibration; External flat field	jw04479002008_03101_00001_nis	9.344387500000002	1.4307027777777779	image	Espinoza, Nestor	2	60265.73434404711	60265.73794782408	300.63	600.0	2800.0	SOSS background measurements	60265.78704855	4479	CAL	--	POLYGON 9.325091017 1.406134443 9.309028286 1.439633085 9.342820993 1.455643805 9.358903106 1.422164532	mast:JWST/product/jw04479002008_03101_00001_nis_trapsfilled.jpg	mast:JWST/product/jw04479002008_03101_00001_nis_rateints.fits	PUBLIC	False	nan	192102532	370481028
science	JWST	CALJWST	NIRISS/IMAGE	JWST	CLEAR;GR700XD	Infrared	ECLIPTIC-RA00	Calibration; External flat field	jw04479002010_03101_00001_nis	9.344387500000002	1.4307027777777779	image	Espinoza, Nestor	2	60265.752856628125	60265.75646040509	300.63	600.0	2800.0	SOSS background measurements	60265.77828695	4479	CAL	--	POLYGON 9.320615514 1.393736439 9.304552697 1.427234998 9.338345138 1.443245893 9.354427339 1.409766703	mast:JWST/product/jw04479002010_03101_00001_nis_trapsfilled.jpg	mast:JWST/product/jw04479002010_03101_00001_nis_rateints.fits	PUBLIC	False	nan	192101873	370481030
science	JWST	CALJWST	NIRISS/IMAGE	JWST	CLEAR;GR700XD	Infrared	ECLIPTIC-RA00	Calibration; External flat field	jw04479002003_03101_00001_nis	9.344387500000002	1.4307027777777779	image	Espinoza, Nestor	2	60265.696891489235	60265.7004952662	300.63	600.0	2800.0	SOSS background measurements	60265.74620367	4479	CAL	--	POLYGON 9.345977528 1.405752567 9.329915153 1.439251378 9.363708024 1.455261742 9.37978978 1.421782299	mast:JWST/product/jw04479002003_03101_00001_nis_trapsfilled.jpg	mast:JWST/product/jw04479002003_03101_00001_nis_rateints.fits	PUBLIC	False	nan	192022229	370481031
science	JWST	CALJWST	NIRISS/IMAGE	JWST	CLEAR;GR700XD	Infrared	ECLIPTIC-RA00	Calibration; External flat field	jw04479001009_03101_00001_nis	9.344387500000002	1.4307027777777779	image	Espinoza, Nestor	2	60265.65868115359	60265.66228493056	300.63	600.0	2800.0	SOSS background measurements	60265.69064807	4479	CAL	--	POLYGON 9.31663705 1.402128898 9.300574174 1.435627456 9.334366739 1.451638351 9.350448997 1.418159162	mast:JWST/product/jw04479001009_03101_00001_nis_trapsfilled.jpg	mast:JWST/product/jw04479001009_03101_00001_nis_rateints.fits	PUBLIC	False	nan	192007022	370481033
science	JWST	CALJWST	NIRISS/IMAGE	JWST	CLEAR;GR700XD	Infrared	ECLIPTIC-RA00	Calibration; External flat field	jw04479001010_03101_00001_nis	9.344387500000002	1.4307027777777779	image	Espinoza, Nestor	2	60265.66791374618	60265.67151752315	300.63	600.0	2800.0	SOSS background measurements	60265.69851845	4479	CAL	--	POLYGON 9.320615515 1.39373645 9.304552703 1.427235011 9.338345146 1.443245901 9.354427342 1.409766709	mast:JWST/product/jw04479001010_03101_00001_nis_trapsfilled.jpg	mast:JWST/product/jw04479001010_03101_00001_nis_rateints.fits	PUBLIC	False	nan	192007024	370481038
science	JWST	CALJWST	NIRISS/IMAGE	JWST	CLEAR;GR700XD	Infrared	ECLIPTIC-RA00	Calibration; External flat field	jw04479002004_03101_00001_nis	9.344387500000002	1.4307027777777779	image	Espinoza, Nestor	2	60265.57441457951	60265.57801835648	300.63	600.0	2800.0	SOSS background measurements	60265.66855308	4479	CAL	--	POLYGON 9.354432351 1.409758728 9.33837033 1.443257722 9.372163444 1.4592677 9.388244845 1.425788073	mast:JWST/product/jw04479002004_03101_00001_nis_trapsfilled.jpg	mast:JWST/product/jw04479002004_03101_00001_nis_rateints.fits	PUBLIC	False	nan	191959981	370481039
science	JWST	CALJWST	NIRISS/IMAGE	JWST	CLEAR;GR700XD	Infrared	ECLIPTIC-RA00	Calibration; External flat field	jw04479001003_03101_00001_nis	9.344387500000002	1.4307027777777779	image	Espinoza, Nestor	2	60265.60216047072	60265.60576424769	300.63	600.0	2800.0	SOSS background measurements	60265.66708326	4479	CAL	--	POLYGON 9.345977518 1.405752619 9.329915147 1.439251431 9.363708019 1.455261792 9.379789772 1.421782347	mast:JWST/product/jw04479001003_03101_00001_nis_trapsfilled.jpg	mast:JWST/product/jw04479001003_03101_00001_nis_rateints.fits	PUBLIC	False	nan	191961744	370481053
...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...
science	JWST	CALJWST	NIRISS/SOSS	JWST	CLEAR;GR700XD	Infrared	HAT-P-14	--	jw01541001001_04101_00001-seg001_nis	260.1161736742332	38.24216472053897	spectrum	Espinoza, Nestor	2	59738.29788028935	59738.55248649306	18855.408	600.0	2800.0	NIRISS Sensitivity and Stability for Transiting Exoplanet Observations	59774.8541666	1541	COM	--	POLYGON 260.16189736 38.23724474 260.11337274 38.23745635 260.11348205 38.24618969 260.16201603 38.24597525 260.16189736 38.23724474	mast:JWST/product/jw01541001001_04101_00001-seg001_nis_ramp.jpg	mast:JWST/product/jw01541001001_04101_00001-seg001_nis_x1dints.fits	PUBLIC	False	nan	85700117	371225133
science	JWST	CALJWST	NIRISS/SOSS	JWST	CLEAR;GR700XD	Infrared	HAT-P-14	Star; Exoplanet Systems; Exoplanets; F dwarfs; F stars	jw01541001001_04101_00001-seg004_nis	260.1161771630844	38.24215651109613	spectrum	Espinoza, Nestor	2	59738.29788028935	59738.55248649306	18855.408	600.0	2800.0	NIRISS Sensitivity and Stability for Transiting Exoplanet Observations	59774.8541666	1541	COM	--	POLYGON 260.16190084 38.23723653 260.11337623 38.23744814 260.11348554 38.24618148 260.16201952 38.24596704 260.16190084 38.23723653	mast:JWST/product/jw01541001001_04101_00001-seg004_nis_ramp.jpg	mast:JWST/product/jw01541001001_04101_00001-seg004_nis_x1dints.fits	PUBLIC	False	nan	85700141	371225200
science	JWST	CALJWST	NIRISS/SOSS	JWST	CLEAR;GR700XD	Infrared	HAT-P-14	Star; Exoplanet Systems; Exoplanets; F dwarfs; F stars	jw01541001001_02101_00002-seg001_nis	260.11617716273054	38.24215651192892	image	Espinoza, Nestor	2	59738.26208069445	59738.262091226854	0.954	600.0	2800.0	NIRISS Sensitivity and Stability for Transiting Exoplanet Observations	59774.8541666	1541	COM	--	POLYGON 260.117045344 38.242630644 260.116929825 38.241464963 260.115456996 38.241551067 260.11557248 38.24271685	mast:JWST/product/jw01541001001_02101_00002-seg001_nis_cal.jpg	mast:JWST/product/jw01541001001_02101_00002-seg001_nis_cal.fits	PUBLIC	False	nan	85700160	371225256
science	JWST	CALJWST	NIRISS/SOSS	JWST	CLEAR;GR700XD	Infrared	HAT-P-14	Star; Exoplanet Systems; Exoplanets; F dwarfs; F stars	jw01541001001_02101_00001-seg001_nis	260.11617716272866	38.24215651193334	image	Espinoza, Nestor	2	59738.26121625	59738.26122678241	0.954	600.0	2800.0	NIRISS Sensitivity and Stability for Transiting Exoplanet Observations	59774.8541666	1541	COM	--	POLYGON 260.116957169 38.242674819 260.116841675 38.241509137 260.115368843 38.241595221 260.115484303 38.242761006	mast:JWST/product/jw01541001001_02101_00001-seg001_nis_cal.jpg	mast:JWST/product/jw01541001001_02101_00001-seg001_nis_cal.fits	PUBLIC	False	nan	85700178	371225300
science	JWST	CALJWST	NIRISS/SOSS	JWST	CLEAR;GR700XD	Infrared	HAT-P-14	Star; Exoplanet Systems; Exoplanets; F dwarfs; F stars	jw01541001001_04101_00001-seg003_nis	260.1161771630844	38.24215651109613	spectrum	Espinoza, Nestor	2	59738.29788028935	59738.55248649306	18855.408	600.0	2800.0	NIRISS Sensitivity and Stability for Transiting Exoplanet Observations	59774.8541666	1541	COM	--	POLYGON 260.16190084 38.23723653 260.11337623 38.23744814 260.11348554 38.24618148 260.16201952 38.24596704 260.16190084 38.23723653	mast:JWST/product/jw01541001001_04101_00001-seg003_nis_ramp.jpg	mast:JWST/product/jw01541001001_04101_00001-seg003_nis_x1dints.fits	PUBLIC	False	nan	85700237	371225426
science	JWST	CALJWST	NIRISS/SOSS	JWST	CLEAR;GR700XD	Infrared	HAT-P-14	--	jw01541001001_04101_00001-seg002_nis	260.1161736742332	38.24216472053897	spectrum	Espinoza, Nestor	2	59738.29788028935	59738.55248649306	18855.408	600.0	2800.0	NIRISS Sensitivity and Stability for Transiting Exoplanet Observations	59774.8541666	1541	COM	--	POLYGON 260.16189736 38.23724474 260.11337274 38.23745635 260.11348205 38.24618969 260.16201603 38.24597525 260.16189736 38.23724474	mast:JWST/product/jw01541001001_04101_00001-seg002_nis_ramp.jpg	mast:JWST/product/jw01541001001_04101_00001-seg002_nis_x1dints.fits	PUBLIC	False	nan	85700224	371225559
science	JWST	CALJWST	NIRISS/SOSS	JWST	CLEAR;GR700XD	Infrared	HAT-P-14	Star; Exoplanet Systems; Exoplanets; F dwarfs; F stars	jw01541001001_04102_00001-seg001_nis	260.1161771633686	38.242156510427485	image	Espinoza, Nestor	2	59738.55390866898	59738.55835982639	329.64	600.0	2800.0	NIRISS Sensitivity and Stability for Transiting Exoplanet Observations	59774.8541666	1541	COM	--	POLYGON 260.071038142 38.249479213 260.119374977 38.246710174 260.118514171 38.23802336 260.070180892 38.24078268	mast:JWST/product/jw01541001001_04102_00001-seg001_nis_ramp.jpg	mast:JWST/product/jw01541001001_04102_00001-seg001_nis_rateints.fits	PUBLIC	False	nan	85700205	371225649
science	JWST	CALJWST	NIRISS/SOSS	JWST	CLEAR;GR700XD	Infrared	CD-38-2551	Star; G stars	jw02113005001_04103_00001-seg001_nis	94.33630544130956	-38.32344481509817	image	Espinoza, Nestor	2	60216.2528283912	60216.257597488424	329.64	600.0	2800.0	Exploring the morning and evening limbs of a transiting exoplanet	60582.57626142	2113	GO	--	POLYGON 94.343963285 -38.287739716 94.342226315 -38.325776892 94.331128864 -38.325424225 94.332859637 -38.287385839	mast:JWST/product/jw02113005001_04103_00001-seg001_nis_ramp.jpg	mast:JWST/product/jw02113005001_04103_00001-seg001_nis_rateints.fits	EXCLUSIVE_ACCESS	False	nan	178895888	373900829
science	JWST	CALJWST	NIRISS/SOSS	JWST	CLEAR;GR700XD	Infrared	CD-38-2551	Star; G stars	jw02113005001_04101_00001-seg001_nis	94.33630544945105	-38.3234448051187	spectrum	Espinoza, Nestor	2	60215.77435597222	60215.77448314815	5.494	600.0	2800.0	Exploring the morning and evening limbs of a transiting exoplanet	60582.58410871	2113	GO	--	POLYGON 94.38208655 -38.32834702 94.33350101 -38.32815311 94.33361111 -38.31941977 94.38219434 -38.31961642 94.38208655 -38.32834702	mast:JWST/product/jw02113005001_04101_00001-seg001_nis_ramp.jpg	mast:JWST/product/jw02113005001_04101_00001-seg001_nis_x1dints.fits	EXCLUSIVE_ACCESS	False	nan	178895938	373900895
science	JWST	CALJWST	NIRISS/SOSS	JWST	CLEAR;GR700XD	Infrared	CD-38-2551	Star; G stars	jw02113-o005_t001_niriss_clear-gr700xd-substrip256	94.33630544540856	-38.32344481007381	spectrum	Espinoza, Nestor	3	60215.75685262732	60216.25049009259	32810.168	600.0	2800.0	Exploring the morning and evening limbs of a transiting exoplanet	60582.96342588	2113	GO	--	POLYGON 94.38208655 -38.32834702 94.33350101 -38.32815311 94.3336111 -38.31941978 94.38219433 -38.31961643 94.38208655 -38.32834702	--	mast:JWST/product/jw02113-o005_t001_niriss_clear-gr700xd-substrip256_x1dints.fits	EXCLUSIVE_ACCESS	False	nan	188165781	373903106

Our query returned many NIRISS observations led by the PI Dr. Espinoza. Let’s get all the unique values under the instrument_name column to see what our * wildcard picked up.

set(observations['instrument_name'])

{'NIRISS/IMAGE', 'NIRISS/SOSS'}

Our observations have the advanced labeling; had we simply set instrument_name = "NIRISS", we would have missed several observations. For more details on this advanced labeling, see the JWST Instrument Names page.

A note of caution: There is such a thing as too many wildcards#

You can be too generous with the wildcards, so be sure to exercise caution in their use. Too much ambiguity can lead to unintended results. Let’s take a look at our example below.

observations = Observations.query_criteria(proposal_pi='Espinoza, Nestor',
                                           instrument_name='NIR*') # Surely only one instrument begins with 'NIR'
set(observations['instrument_name'])

{'NIRISS/IMAGE', 'NIRISS/SOSS', 'NIRSPEC/SLIT'}

This query returns NIRSPEC/SLIT observations in addition to the NIRISS ones, which is not what we intended.

Case 2: Wildcard Search with `instrument_name` and `proposal_id`#

Let’s add an additional string criterion and wildcard into the mix. We’ll do this with the proposal_id field which, despite its numeric content, is encoded as a string.

Let’s query for a four digit proposal/program IDs that begin with 15.

observations = Observations.query_criteria(proposal_pi='Espinoza, Nestor',
                                           instrument_name='NIRISS*',
                                           proposal_id=['15%%']) # Only a four digit result will match this

set(observations['proposal_id']), set(observations['instrument_name'])

({'1512', '1541'}, {'NIRISS/IMAGE', 'NIRISS/SOSS'})

Case 3: Create a Moving Target Ephemeris using MAST Observations with Wildcard Search#

We will be querying for image observations of Comet 67P Churyumov-Gerasimenko observed through the Hubble Space Telescope’s Advanced Camera for Surveys (ACS) Wide Field Camera (WFC). This comet’s name can be listed in different ways, so we will use * wildcards in our criteria query.

observations = Observations.query_criteria(target_name="*67P*",
                                           instrument_name="ACS/WFC")

print(f"{len(observations)} total observations" + "\n")
print("Listed target names:")
print(set(observations['target_name']))

140 total observations

Listed target names:
{'COMET-67P-CHURYUMOV-GER-UPDATE', 'COMET-67P-CHURYUMOV-GERASIMENK'}

Above there are two names we get for Comet-67P. You should exercise caution when searching on the target_name criteria, since this is often entered by the PI who proposed the observation and can vary from person to person.

In the remainder of this notebook, we will construct a bare-bones ephemeris using the filtered MAST observations of this object and their metadata. We will then do some reverse engineering to query for the target based on coordinates using the ephemeris table, and hope that we get the same results back! Let’s begin:

For simplicity, let’s work only with the 'COMET-67P-CHURYUMOV-GERASIMENK' observations to create our ephemeris.

mask = observations["target_name"] == "COMET-67P-CHURYUMOV-GERASIMENK"
filtered_observations = observations[mask]
filtered_observations

Table masked=True length=70

intentType	obs_collection	provenance_name	instrument_name	project	filters	wavelength_region	target_name	target_classification	obs_id	s_ra	s_dec	dataproduct_type	proposal_pi	calib_level	t_min	t_max	t_exptime	em_min	em_max	obs_title	t_obs_release	proposal_id	proposal_type	sequence_number	s_region	jpegURL	dataURL	dataRights	mtFlag	srcDen	obsid	objID
str7	str3	str6	str7	str3	str12	str7	str30	str89	str36	float64	float64	str5	str14	int64	float64	float64	float64	float64	float64	str119	float64	str5	str3	int64	str2243	str86	str35	str6	bool	float64	str8	str9
science	HST	CALACS	ACS/WFC	HST	F775W	Optical	COMET-67P-CHURYUMOV-GERASIMENK	COMET; COMET-67P-CHURYUMOV-GERASIMENKO WHICH IS THE PRIMARY TARGET FOR ROSETTA SPACECRAFT	jcis06010	290.9112348543	-27.90621726673	image	Hines, Dean C.	3	56979.505933368055	56979.51200949074	300.0	690.0	860.0	Imaging Polarimetry of the 67P/Churyumov-Gerasimenko with ACS: Supporting the Rosetta Mission	57344.94012718	13863	GO	--	POLYGON -69.07205442999998 -27.91834206 -69.072058317717648 -27.918294549551291 -69.070418239999981 -27.91807766 -69.072739870000021 -27.88970302 -69.103821919999973 -27.89381052 -69.103818044368452 -27.893858065783444 -69.105458039999974 -27.89407459 -69.103144859999986 -27.92244975 -69.07205442999998 -27.91834206 -69.07205442999998 -27.91834206	mast:HST/product/jcis06010_drz.jpg	mast:HST/product/jcis06010_drz.fits	PUBLIC	True	nan	24839235	374073891
science	HST	CALACS	ACS/WFC	HST	F606W	Optical	COMET-67P-CHURYUMOV-GERASIMENK	COMET; COMET-67P-CHURYUMOV-GERASIMENKO WHICH IS THE PRIMARY TARGET FOR ROSETTA SPACECRAFT	jcis06020	290.9147892768	-27.90546497065	image	Hines, Dean C.	3	56979.51550486111	56979.66734533565	6280.0	470.0	720.0	Imaging Polarimetry of the 67P/Churyumov-Gerasimenko with ACS: Supporting the Rosetta Mission	57344.94447902	13863	GO	--	POLYGON -69.051552329999993 -27.91547868 -69.051566623053915 -27.915304522529482 -69.048023170000022 -27.91483611 -69.048086300262 -27.914066875478145 -69.045198070000026 -27.91368501 -69.045253211462011 -27.913013321787403 -69.031596869999987 -27.91120688 -69.031681552501226 -27.910176912272057 -69.027714189999983 -27.90965175 -69.02772849552359 -27.909477898544647 -69.024182240000016 -27.90900847 -69.02653583 -27.88039823 -69.057861839999987 -27.88454222 -69.057847539106191 -27.884716718646743 -69.06139399 -27.88518549 -69.06130963442007 -27.88621477953863 -69.065275460000009 -27.88673877 -69.0652204552501 -27.887410472053556 -69.078874509999991 -27.8892136 -69.078813220742 -27.889963190045712 -69.098235400000021 -27.89252561 -69.098220005459254 -27.892714303389873 -69.102038349999987 -27.89321784 -69.099703449999993 -27.92182943 -69.082889846828763 -27.919611642662879 -69.082889340000008 -27.91961784 -69.051552329999993 -27.91547868 -69.051552329999993 -27.91547868	mast:HST/product/jcis06020_drz.jpg	mast:HST/product/jcis06020_drz.fits	PUBLIC	True	nan	24839236	374073949
science	HST	CALACS	ACS/WFC	HST	F606W	Optical	COMET-67P-CHURYUMOV-GERASIMENK	COMET; COMET-67P-CHURYUMOV-GERASIMENKO WHICH IS THE PRIMARY TARGET FOR ROSETTA SPACECRAFT	jcis05020	290.5842080034	-27.96554445143	image	Hines, Dean C.	3	56978.454278206016	56978.60601420139	6280.0	470.0	720.0	Imaging Polarimetry of the 67P/Churyumov-Gerasimenko with ACS: Supporting the Rosetta Mission	57343.75185176	13863	GO	--	POLYGON -69.38324793999999 -27.97644 -69.38325337699672 -27.976084633770142 -69.37975694 -27.975807 -69.379771610697432 -27.974848106719922 -69.376938269999982 -27.97462306 -69.376959271556942 -27.973252682572433 -69.363480320000008 -27.97218126 -69.363499179187144 -27.970960544973902 -69.35957473000002 -27.97064824 -69.35958024246527 -27.970293021520565 -69.35608091 -27.97001454 -69.356525560000023 -27.94135352 -69.388067579999984 -27.94386099 -69.388062164224209 -27.944216860866497 -69.391561589999981 -27.94449469 -69.391543021733554 -27.945714773910108 -69.39546565 -27.94602599 -69.395444888234721 -27.947396421736535 -69.408921220000025 -27.94846475 -69.408906811818213 -27.9494236609726 -69.41173950000001 -27.94964805 -69.411734159831681 -27.950004069145866 -69.415230679999979 -27.95028105 -69.415223505589069 -27.950759354159036 -69.427996080000014 -27.95177004 -69.427990357442667 -27.952155441892863 -69.431772200000012 -27.95245457 -69.431346519999977 -27.98111569 -69.399792699999978 -27.97861726 -69.399798527580231 -27.97823255633358 -69.396016780000025 -27.97793273 -69.39602403128157 -27.97745404126006 -69.38324793999999 -27.97644 -69.38324793999999 -27.97644	mast:HST/product/jcis05020_drz.jpg	mast:HST/product/jcis05020_drz.fits	PUBLIC	True	nan	24839234	374074014
science	HST	CALACS	ACS/WFC	HST	F606W	Optical	COMET-67P-CHURYUMOV-GERASIMENK	COMET; COMET-67P-CHURYUMOV-GERASIMENKO WHICH IS THE PRIMARY TARGET FOR ROSETTA SPACECRAFT	jcis03010	280.9542165962	-30.99542663878	image	Hines, Dean C.	3	56889.322632372685	56889.548465706015	9600.0	470.0	720.0	Imaging Polarimetry of the 67P/Churyumov-Gerasimenko with ACS: Supporting the Rosetta Mission	57254.78804398	13863	GO	--	POLYGON -79.05840738 -31.01316703 -79.026878020000026 -31.00584488 -79.033151780000026 -30.97766767 -79.035392031871083 -30.978188257438966 -79.035550100000023 -30.97747812 -79.042032257876684 -30.978984322746957 -79.04228344 -30.97785538 -79.044393200704519 -30.978345489210106 -79.044542289999981 -30.9776754 -79.0519318160874 -30.979391859188709 -79.052526699999987 -30.97671682 -79.054630711213818 -30.97720541840804 -79.054779619999977 -30.9765358 -79.0610665098948 -30.977995640936911 -79.061717779999981 -30.97506566 -79.0638160189322 -30.975552764251791 -79.063964759999976 -30.97488358 -79.09548675000002 -30.9821973 -79.089230410000027 -31.01037747 -79.087131972414525 -31.009890899345596 -79.086983480000015 -31.01055955 -79.080693324737766 -31.009100920228253 -79.08004225000002 -31.01203134 -79.077938041505035 -31.011543277238278 -79.077789380000013 -31.01221237 -79.070396015373021 -31.010497338548994 -79.06980123 -31.01317303 -79.067691267708852 -31.012683456849597 -79.06754243 -31.013353 -79.061056825969644 -31.011848027080774 -79.060805640000012 -31.0129775 -79.058565179306754 -31.012457479047875 -79.05840738 -31.01316703 -79.05840738 -31.01316703	mast:HST/product/jcis03010_drz.jpg	mast:HST/product/jcis03010_drz.fits	PUBLIC	True	nan	24839230	374074520
science	HST	CALACS	ACS/WFC	HST	F606W	Optical	COMET-67P-CHURYUMOV-GERASIMENK	COMET; COMET-67P-CHURYUMOV-GERASIMENKO WHICH IS THE PRIMARY TARGET FOR ROSETTA SPACECRAFT	jcis04020	290.2770693515	-28.02111499969	image	Hines, Dean C.	3	56977.45820188658	56977.611049039355	6280.0	470.0	720.0	Imaging Polarimetry of the 67P/Churyumov-Gerasimenko with ACS: Supporting the Rosetta Mission	57342.94112256	13863	GO	--	POLYGON -69.68999134 -28.03180292 -69.690000793261078 -28.0314964187349 -69.68653658 -28.03117872 -69.686564584120333 -28.03027073277142 -69.683764119999978 -28.03001384 -69.6838006065022 -28.028831798853574 -69.67044575 -28.02760593 -69.670481996731183 -28.026436279688706 -69.666591489999973 -28.02607881 -69.666601003399478 -28.025772506303237 -69.663133870000024 -28.02545393 -69.664023900000018 -27.99678969 -69.695551850000015 -27.99968392 -69.695542411269713 -27.999990871866526 -69.69900966 -28.0003088 -69.6989737114984 -28.001477839264155 -69.702862620000019 -28.00183422 -69.702826356326327 -28.00301616323647 -69.716178669999977 -28.00423892 -69.716150921131742 -28.005146940581007 -69.718950740000025 -28.00540317 -69.718941361850952 -28.005710310378014 -69.722405690000016 -28.00602736 -69.722395728297926 -28.006353608328851 -69.735389909999981 -28.00754168 -69.7353798073961 -28.007874214140372 -69.739126740000017 -28.00821667 -69.73825566 -28.03688132 -69.70671568 -28.03399601 -69.706725863943035 -28.033664169692418 -69.70297905000001 -28.03332102 -69.702989071877354 -28.032994456845575 -69.68999134 -28.03180292 -69.68999134 -28.03180292	mast:HST/product/jcis04020_drz.jpg	mast:HST/product/jcis04020_drz.fits	PUBLIC	True	nan	24839232	374852621
science	HST	CALACS	ACS/WFC	HST	F775W	Optical	COMET-67P-CHURYUMOV-GERASIMENK	COMET; COMET-67P-CHURYUMOV-GERASIMENKO WHICH IS THE PRIMARY TARGET FOR ROSETTA SPACECRAFT	jcis05010	290.5806735758	-27.96626079113	image	Hines, Dean C.	3	56978.44466003472	56978.45073653935	300.0	690.0	860.0	Imaging Polarimetry of the 67P/Churyumov-Gerasimenko with ACS: Supporting the Rosetta Mission	57343.70451382	13863	GO	--	POLYGON -69.403442700000028 -27.97923304 -69.403444700846464 -27.979100547103432 -69.401826809999989 -27.97897202 -69.40225662 -27.95052573 -69.433575589999975 -27.95301089 -69.433573626058035 -27.953143446156233 -69.435191219999979 -27.95327161 -69.43476999 -27.98171799 -69.403442700000028 -27.97923304 -69.403442700000028 -27.97923304	mast:HST/product/jcis05010_drz.jpg	mast:HST/product/jcis05010_drz.fits	PUBLIC	True	nan	24839233	369035492
science	HST	CALACS	ACS/WFC	HST	F606W	Optical	COMET-67P-CHURYUMOV-GERASIMENK	COMET; COMET BEING ORBITED BY THE ROSETTA SPACECRAFT	jcz301010	148.6544847864	17.89356942054	image	Hines, Dean C.	3	57305.47050170139	57305.49995790509	1868.0	470.0	720.0	Post-Perihelion Imaging Polarimetry of the 67P/Churyumov-Gerasimenko with ACS: Continued Support of the Rosetta Mission	57671.63094901	14261	GO	--	POLYGON 148.69195443 17.89721012 148.68672841023698 17.898793036618102 148.68699035 17.89940911 148.68079264145175 17.901286131427462 148.68095142 17.9016596 148.65292317 17.91014527 148.65250560953473 17.909162730128802 148.64610927 17.91109857 148.63481426 17.88451419 148.65263308739057 17.879121057787451 148.65263008 17.87911398 148.68065353 17.87062838 148.69195443 17.89721012 148.69195443 17.89721012	mast:HST/product/jcz301010_drz.jpg	mast:HST/product/jcz301010_drz.fits	PUBLIC	True	nan	25001890	373785052
science	HST	CALACS	ACS/WFC	HST	F606W	Optical	COMET-67P-CHURYUMOV-GERASIMENK	COMET; COMET BEING ORBITED BY THE ROSETTA SPACECRAFT	jcz302010	149.0210592664	17.79521475611	image	Hines, Dean C.	3	57306.00024725695	57306.02970309028	1868.0	470.0	720.0	Post-Perihelion Imaging Polarimetry of the 67P/Churyumov-Gerasimenko with ACS: Continued Support of the Rosetta Mission	57672.2263889	14261	GO	--	POLYGON 149.05898205 17.79748171 149.05396387760246 17.799381902109118 149.05409679 17.79964078 149.04813166312613 17.801899341627337 149.04814366 17.80192271 149.02083733 17.81225854 149.02015424058055 17.810927544842077 149.01400423 17.81325475 149.00078955 17.78750012 149.02809307 17.77716698 149.02863132569428 17.778215844015303 149.04576215 17.77173013 149.05898205 17.79748171 149.05898205 17.79748171	mast:HST/product/jcz302010_drz.jpg	mast:HST/product/jcz302010_drz.fits	PUBLIC	True	nan	25001891	369115725
science	HST	CALACS	ACS/WFC	HST	F606W	Optical	COMET-67P-CHURYUMOV-GERASIMENK	COMET; COMET BEING ORBITED BY THE ROSETTA SPACECRAFT	jcz303010	149.386341824	17.6965860963	image	Hines, Dean C.	3	57306.530825775466	57306.56028197917	1868.0	470.0	720.0	Post-Perihelion Imaging Polarimetry of the 67P/Churyumov-Gerasimenko with ACS: Continued Support of the Rosetta Mission	57672.72732635	14261	GO	--	POLYGON 149.42419008 17.69882864 149.419199178432 17.700727169054169 149.41933345 17.70098796 149.41339666747842 17.703246092045436 149.41340981 17.70327162 149.38611359 17.71365103 149.3854302694572 17.712323331878636 149.37931127 17.71464943 149.36605771 17.68889173 149.39335114 17.67851501 149.39388702876451 17.679556324023046 149.41093132 17.67307379 149.42419008 17.69882864 149.42419008 17.69882864	mast:HST/product/jcz303010_drz.jpg	mast:HST/product/jcz303010_drz.fits	PUBLIC	True	nan	25001892	373724032
science	HST	CALACS	ACS/WFC	HST	F606W	Optical	COMET-67P-CHURYUMOV-GERASIMENK	COMET; COMET-67P-CHURYUMOV-GERASIMENKO WHICH IS THE PRIMARY TARGET FOR ROSETTA SPACECRAFT	jcis01010	281.2558788729	-31.01619293249	image	Hines, Dean C.	3	56887.26573422454	56887.49156755787	7200.0	470.0	720.0	Imaging Polarimetry of the 67P/Churyumov-Gerasimenko with ACS: Supporting the Rosetta Mission	57252.60829852	13863	GO	--	POLYGON -78.756865950000019 -31.03386473 -78.72529176 -31.02670072 -78.731368569999972 -30.9985026 -78.733805750513454 -30.9990559361688 -78.733958120000011 -30.99834869 -78.740986132787157 -30.99994418656815 -78.741227330000015 -30.9988241 -78.743523208857965 -30.999345171906345 -78.743666940000026 -30.9986777 -78.751640936670128 -31.000487279621648 -78.752215089999993 -30.99781954 -78.754505385727953 -30.998339146989291 -78.75464896 -30.99767203 -78.761518775521665 -30.999230471627669 -78.762147550000009 -30.99630741 -78.764432262131379 -30.996825567137762 -78.764575690000015 -30.99615878 -78.796142359999976 -31.00331385 -78.79008367 -31.03151488 -78.787798738721818 -31.030997298944033 -78.787655570000027 -31.0316635 -78.780782261578381 -31.030106426334836 -78.780153620000021 -31.03303019 -78.777863106729612 -31.032511160972405 -78.777719789999992 -31.0331777 -78.769741953915457 -31.031369732821123 -78.76916795 -31.03403788 -78.766871853092809 -31.033517388181245 -78.766728380000018 -31.03418428 -78.759696670679176 -31.032590149820496 -78.759455460000027 -31.03371081 -78.757018048375642 -31.033158086745466 -78.756865950000019 -31.03386473 -78.756865950000019 -31.03386473	mast:HST/product/jcis01010_drz.jpg	mast:HST/product/jcis01010_drz.fits	PUBLIC	True	nan	24839228	369010069
...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...	...
science	HLA	HLA	ACS/WFC	HLA	F606WPOL0V	--	COMET-67P-CHURYUMOV-GERASIMENK	--	hst_14261_01_acs_wfc_f606wpol0v_03	148.66732409763495	17.890361436578964	image	Hines	2	57305.48654	57305.49196	467.0	nan	nan	--	57671.63094901	14261	HLA	--	POLYGON J2000 148.68699020 17.89940760 148.65896120 17.90789540 148.64766000 17.88131330 148.67568530 17.87282710 148.68699020 17.89940760	https://hla.stsci.edu/cgi-bin/preview.cgi?dataset=hst_14261_01_acs_wfc_f606wpol0v_03	--	PUBLIC	--	nan	26004659	67971926
science	HLA	HLA	ACS/WFC	HLA	F606WPOL0V	--	COMET-67P-CHURYUMOV-GERASIMENK	--	hst_14261_01_acs_wfc_f606wpol0v_04	148.66128404740527	17.89261143672076	image	Hines	2	57305.47852	57305.48394	467.0	nan	nan	--	57671.63094901	14261	HLA	--	POLYGON J2000 148.68095050 17.90165830 148.65292040 17.91014550 148.64161960 17.88356260 148.66964610 17.87507700 148.68095050 17.90165830	https://hla.stsci.edu/cgi-bin/preview.cgi?dataset=hst_14261_01_acs_wfc_f606wpol0v_04	--	PUBLIC	--	nan	26004660	67971927
science	HLA	HLA	ACS/WFC	HLA	F606WPOL60V	--	COMET-67P-CHURYUMOV-GERASIMENK	--	hst_14261_02_acs_wfc_f606wpol60v_01	149.0387234255141	17.789775192433133	image	Hines	2	57306.02429	57306.02971	467.0	nan	nan	--	57672.2263889	14261	HLA	--	POLYGON J2000 149.03168180 17.80781910 149.01846070 17.78206810 149.04576370 17.77173100 149.05898790 17.79748020 149.03168180 17.80781910	https://hla.stsci.edu/cgi-bin/preview.cgi?dataset=hst_14261_02_acs_wfc_f606wpol60v_01	--	PUBLIC	--	nan	26004661	67971928
science	HLA	HLA	ACS/WFC	HLA	F606WPOL60V	--	COMET-67P-CHURYUMOV-GERASIMENK	--	hst_14261_02_acs_wfc_f606wpol60v_02	149.02788342509825	17.794214142733026	image	Hines	2	57306.00826	57306.01368	467.0	nan	nan	--	57672.2263889	14261	HLA	--	POLYGON J2000 149.04814860 17.80192050 149.02084030 17.81225830 149.00762000 17.78650570 149.03492520 17.77616980 149.04814860 17.80192050	https://hla.stsci.edu/cgi-bin/preview.cgi?dataset=hst_14261_02_acs_wfc_f606wpol60v_02	--	PUBLIC	--	nan	26004662	67971929
science	HLA	HLA	ACS/WFC	HLA	F606WPOL60V	--	COMET-67P-CHURYUMOV-GERASIMENK	--	hst_14261_02_acs_wfc_f606wpol60v_03	149.02105347495342	17.795211192797524	image	Hines	2	57306.00024	57306.00566	467.0	nan	nan	--	57672.2263889	14261	HLA	--	POLYGON J2000 149.00078990 17.78750200 149.02809590 17.77716680 149.04131880 17.80291830 149.01400960 17.81325530 149.00078990 17.78750200	https://hla.stsci.edu/cgi-bin/preview.cgi?dataset=hst_14261_02_acs_wfc_f606wpol60v_03	--	PUBLIC	--	nan	26004663	67971930
science	HLA	HLA	ACS/WFC	HLA	F606WPOL60V	--	COMET-67P-CHURYUMOV-GERASIMENK	--	hst_14261_02_acs_wfc_f606wpol60v_04	149.03383347531883	17.791933192580494	image	Hines	2	57306.01628	57306.0217	467.0	nan	nan	--	57672.2263889	14261	HLA	--	POLYGON J2000 149.02679120 17.80997720 149.01357040 17.78422550 149.04087430 17.77388890 149.05409830 17.79963880 149.02679120 17.80997720	https://hla.stsci.edu/cgi-bin/preview.cgi?dataset=hst_14261_02_acs_wfc_f606wpol60v_04	--	PUBLIC	--	nan	26004664	67971931
science	HLA	HLA	ACS/WFC	HLA	F606WPOL120V	--	COMET-67P-CHURYUMOV-GERASIMENK	--	hst_14261_03_acs_wfc_f606wpol120v_01	149.39313343193777	17.695584189165338	image	Hines	2	57306.53884	57306.54426	467.0	nan	nan	--	57672.72732635	14261	HLA	--	POLYGON J2000 149.41341280 17.70327040 149.38611500 17.71365150 149.37285580 17.68789590 149.40015050 17.67751650 149.41341280 17.70327040	https://hla.stsci.edu/cgi-bin/preview.cgi?dataset=hst_14261_03_acs_wfc_f606wpol120v_01	--	PUBLIC	--	nan	26004665	67971932
science	HLA	HLA	ACS/WFC	HLA	F606WPOL120V	--	COMET-67P-CHURYUMOV-GERASIMENK	--	hst_14261_03_acs_wfc_f606wpol120v_02	149.39905343216378	17.69330118900645	image	Hines	2	57306.54686	57306.55228	467.0	nan	nan	--	57672.72732635	14261	HLA	--	POLYGON J2000 149.37877620 17.68561370 149.40606970 17.67523370 149.41933240 17.70098660 149.39203580 17.71136840 149.37877620 17.68561370	https://hla.stsci.edu/cgi-bin/preview.cgi?dataset=hst_14261_03_acs_wfc_f606wpol120v_02	--	PUBLIC	--	nan	26004666	67971933
science	HLA	HLA	ACS/WFC	HLA	F606WPOL120V	--	COMET-67P-CHURYUMOV-GERASIMENK	--	hst_14261_03_acs_wfc_f606wpol120v_03	149.38633343179924	17.696582189227897	image	Hines	2	57306.53082	57306.53624	467.0	nan	nan	--	57672.72732635	14261	HLA	--	POLYGON J2000 149.37931420 17.71464960 149.36605570 17.68889320 149.39335130 17.67851450 149.40661290 17.70426910 149.37931420 17.71464960	https://hla.stsci.edu/cgi-bin/preview.cgi?dataset=hst_14261_03_acs_wfc_f606wpol120v_03	--	PUBLIC	--	nan	26004667	67971934
science	HLA	HLA	ACS/WFC	HLA	F606WPOL120V	--	COMET-67P-CHURYUMOV-GERASIMENK	--	hst_14261_03_acs_wfc_f606wpol120v_04	149.40391343235848	17.69114218886538	image	Hines	2	57306.55487	57306.56029	467.0	nan	nan	--	57672.72732635	14261	HLA	--	POLYGON J2000 149.42419210 17.69882700 149.39689650 17.70920930 149.38363650 17.68345530 149.41092900 17.67307470 149.42419210 17.69882700	https://hla.stsci.edu/cgi-bin/preview.cgi?dataset=hst_14261_03_acs_wfc_f606wpol120v_04	--	PUBLIC	--	nan	26004668	67971935

Now that we have our filtered observations, let’s sort the rows of this table based on the t_min criteria, which refers to the start time of the exposure in MJD.

filtered_observations.sort("t_min")

Now that we’ve sorted our table, let’s construct a basic ephemeris showing the path of our object over time (with t_min, or exposure start in MJD, as our time component):

ephemeris = Table([filtered_observations["s_ra"],
                   filtered_observations["s_dec"],
                   filtered_observations["t_min"]], names=("ra", "dec", "t_min"))

Let’s display the contents of our ephemeris, and use it to generate a plot of the comet’s path:

ephemeris.sort("t_min")
ephemeris

Table length=70

ra	dec	t_min
float64	float64	float64
281.2558788729	-31.01619293249	56887.26573422454
281.1070408364967	-31.006679797131913	56888.26101
281.1070302812	-31.0066887554	56888.26101200232
281.1045408863173	-31.00650879708346	56888.27707
281.0975108367455	-31.006933797314236	56888.32419
281.0951608865579	-31.006770747268593	56888.34025
281.0868808868347	-31.005851797486205	56888.39054
281.0845408866453	-31.005687797434355	56888.40661
281.0773208868312	-31.004271747618215	56888.4569
281.0749808366519	-31.004106747569107	56888.47296
...	...	...
149.02105347495342	17.795211192797524	57306.00024
149.0210592664	17.79521475611	57306.00024725695
149.02788342509825	17.794214142733026	57306.00826
149.03383347531883	17.791933192580494	57306.01628
149.0387234255141	17.789775192433133	57306.02429
149.38633343179924	17.696582189227897	57306.53082
149.386341824	17.6965860963	57306.530825775466
149.39313343193777	17.695584189165338	57306.53884
149.39905343216378	17.69330118900645	57306.54686
149.40391343235848	17.69114218886538	57306.55487

plt.figure(figsize=(12,8))
plt.scatter(ephemeris[0:18]['ra'], ephemeris[0:18]['dec'], color='royalblue', s=200, lw=1., edgecolor='k')

plt.xlabel("Right Ascension (deg)", fontsize=20)
plt.ylabel("Declination (deg)", fontsize=20)

plt.title("Sky Coordinates", fontsize=20)

plt.xticks(fontsize=15)
plt.yticks(fontsize=15)
plt.grid()

../../../_images/d3d387e2a18fb51ea10bbcd20c6974ef6784a5a41564b41d5fa09c124ad1fa88.png

You can choose to save the ephemeris table in your current working directory by running the cell below:

# Overwriting is not necessary, but prevents this Notebook from failing STScI's automated testing
ephemeris.write('ephemeris-comet67p-cg.csv', format='ascii', overwrite=True)

Resources#

The following is a list of resources that were referenced throughout the tutorial, as well as some additional references that you may find useful:

Citations#

If you use any of astroquery’s tools for published research, please cite the authors. Follow this link for more information about citing astroquery:

Citing astroquery

About This Notebook#

If you have comments or questions on this notebook, please contact us through the Archive Help Desk e-mail at archive@stsci.edu.

Author: Jenny V. Medina
Keywords: astroquery, wildcards, moving target
Last Updated: Jun 2023