HorizonsClass

class astroquery.jplhorizons.HorizonsClass(id=None, location=None, epochs=None, id_type='smallbody')[source]

Bases: astroquery.query.BaseQuery

A class for querying the JPL Horizons service.

Instantiate JPL query.

Parameters
idstr, required

Name, number, or designation of the object to be queried

locationstr or dict, optional

Observer’s location for ephemerides queries or center body name for orbital element or vector queries. Uses the same codes as JPL Horizons. If no location is provided, Earth’s center is used for ephemerides queries and the Sun’s center for elements and vectors queries. Arbitrary topocentic coordinates for ephemerides queries can be provided in the format of a dictionary. The dictionary has to be of the form {'lon': longitude in deg (East positive, West negative), 'lat': latitude in deg (North positive, South negative), 'elevation': elevation in km above the reference ellipsoid, ['body': Horizons body ID of the central body; optional; if this value is not provided it is assumed that this location is on Earth]}.

epochsscalar, list-like, or dictionary, optional

Either a list of epochs in JD or MJD format or a dictionary defining a range of times and dates; the range dictionary has to be of the form {'start':’YYYY-MM-DD [HH:MM:SS]’, 'stop':’YYYY-MM-DD [HH:MM:SS]’, 'step':’n[y|d|m|s]’}. If no epochs are provided, the current time is used.

id_typestr, optional

Identifier type, options: 'smallbody', 'majorbody' (planets but also anything that is not a small body), 'designation', 'name', 'asteroid_name', 'comet_name', 'id' (Horizons id number), or 'smallbody' (find the closest match under any id_type), default: 'smallbody'

Examples

>>> from astroquery.jplhorizons import Horizons
>>> eros = Horizons(id='433', location='568',
...              epochs={'start':'2017-01-01',
...                      'stop':'2017-02-01',
...                      'step':'1d'})
>>> print(eros) 
JPLHorizons instance "433"; location=568, epochs={'start': '2017-01-01', 'step': '1d', 'stop': '2017-02-01'}, id_type=smallbody

Attributes Summary

TIMEOUT

Methods Summary

elements(*args, **kwargs)

Queries the service and returns a table object.

elements_async([get_query_payload, …])

Query JPL Horizons for osculating orbital elements.

ephemerides(*args, **kwargs)

Queries the service and returns a table object.

ephemerides_async([airmass_lessthan, …])

Query JPL Horizons for ephemerides.

vectors(*args, **kwargs)

Queries the service and returns a table object.

vectors_async([get_query_payload, …])

Query JPL Horizons for state vectors.

Attributes Documentation

TIMEOUT = 30

Methods Documentation

elements(*args, **kwargs)

Queries the service and returns a table object.

Query JPL Horizons for osculating orbital elements. The location parameter in HorizonsClass refers in this case to the center body relative to which the elements are provided.

The following table lists the values queried, their definitions, data types, units, and original Horizons designations (where available). For more information on the definitions of these quantities, please refer to the Horizons User Manual.

Column Name

Definition

targetname

official number, name, designation (string)

H

absolute magnitude in V band (float, mag)

G

photometric slope parameter (float)

M1

comet total abs mag (float, mag, M1)

M2

comet nuclear abs mag (float, mag, M2)

k1

total mag scaling factor (float, k1)

k2

nuclear mag scaling factor (float, k2)

phasecoeff

comet phase coeff (float, mag/deg, PHCOFF)

datetime_str

epoch Date (str, Calendar Date (TDB))

datetime_jd

epoch Julian Date (float, JDTDB)

e

eccentricity (float, EC)

q

periapsis distance (float, au, QR)

a

semi-major axis (float, au, A)

incl

inclination (float, deg, IN)

Omega

longitude of Asc. Node (float, deg, OM)

w

argument of the perifocus (float, deg, W)

Tp_jd

time of periapsis (float, Julian Date, Tp)

n

mean motion (float, deg/d, N)

M

mean anomaly (float, deg, MA)

nu

true anomaly (float, deg, TA)

period

orbital period (float, (Earth) d, PR)

Q

apoapsis distance (float, au, AD)

Parameters
refsystemstring

Element reference system for geometric and astrometric quantities: 'J2000' or 'B1950'; default: 'J2000'

refplanestring

Reference plane for all output quantities: 'ecliptic' (ecliptic and mean equinox of reference epoch), 'earth' (Earth mean equator and equinox of reference epoch), or 'body' (body mean equator and node of date); default: 'ecliptic'

tp_typestring

Representation for time-of-perihelion passage: 'absolute' or 'relative' (to epoch); default: 'absolute'

closest_apparitionboolean, optional

Only applies to comets. This option will choose the closest apparition available in time to the selected epoch; default: False. Do not use this option for non-cometary objects.

no_fragmentsboolean, optional

Only applies to comets. Reject all comet fragments from selection; default: False. Do not use this option for non-cometary objects.

get_query_payloadboolean, optional

When set to True the method returns the HTTP request parameters as a dict, default: False

get_raw_response: boolean, optional

Return raw data as obtained by JPL Horizons without parsing the data into a table, default: False

Returns
tableA Table object.

Examples

>>> from astroquery.jplhorizons import Horizons
>>> obj = Horizons(id='433', location='500@10',
...                epochs=2458133.33546)
>>> el = obj.elements() 
>>> print(el) 
    targetname      datetime_jd  ...       Q            P
       ---               d       ...       AU           d
------------------ ------------- ... ------------- ------------
433 Eros (1898 DQ) 2458133.33546 ... 1.78244263804 642.93873484
elements_async(get_query_payload=False, refsystem='J2000', refplane='ecliptic', tp_type='absolute', closest_apparition=False, no_fragments=False, get_raw_response=False, cache=True)[source]

Query JPL Horizons for osculating orbital elements. The location parameter in HorizonsClass refers in this case to the center body relative to which the elements are provided.

The following table lists the values queried, their definitions, data types, units, and original Horizons designations (where available). For more information on the definitions of these quantities, please refer to the Horizons User Manual.

Column Name

Definition

targetname

official number, name, designation (string)

H

absolute magnitude in V band (float, mag)

G

photometric slope parameter (float)

M1

comet total abs mag (float, mag, M1)

M2

comet nuclear abs mag (float, mag, M2)

k1

total mag scaling factor (float, k1)

k2

nuclear mag scaling factor (float, k2)

phasecoeff

comet phase coeff (float, mag/deg, PHCOFF)

datetime_str

epoch Date (str, Calendar Date (TDB))

datetime_jd

epoch Julian Date (float, JDTDB)

e

eccentricity (float, EC)

q

periapsis distance (float, au, QR)

a

semi-major axis (float, au, A)

incl

inclination (float, deg, IN)

Omega

longitude of Asc. Node (float, deg, OM)

w

argument of the perifocus (float, deg, W)

Tp_jd

time of periapsis (float, Julian Date, Tp)

n

mean motion (float, deg/d, N)

M

mean anomaly (float, deg, MA)

nu

true anomaly (float, deg, TA)

period

orbital period (float, (Earth) d, PR)

Q

apoapsis distance (float, au, AD)

Parameters
refsystemstring

Element reference system for geometric and astrometric quantities: 'J2000' or 'B1950'; default: 'J2000'

refplanestring

Reference plane for all output quantities: 'ecliptic' (ecliptic and mean equinox of reference epoch), 'earth' (Earth mean equator and equinox of reference epoch), or 'body' (body mean equator and node of date); default: 'ecliptic'

tp_typestring

Representation for time-of-perihelion passage: 'absolute' or 'relative' (to epoch); default: 'absolute'

closest_apparitionboolean, optional

Only applies to comets. This option will choose the closest apparition available in time to the selected epoch; default: False. Do not use this option for non-cometary objects.

no_fragmentsboolean, optional

Only applies to comets. Reject all comet fragments from selection; default: False. Do not use this option for non-cometary objects.

get_query_payloadboolean, optional

When set to True the method returns the HTTP request parameters as a dict, default: False

get_raw_response: boolean, optional

Return raw data as obtained by JPL Horizons without parsing the data into a table, default: False

Returns
responserequests.Response

The response of the HTTP request.

Examples

>>> from astroquery.jplhorizons import Horizons
>>> obj = Horizons(id='433', location='500@10',
...                epochs=2458133.33546)
>>> el = obj.elements() 
>>> print(el) 
    targetname      datetime_jd  ...       Q            P
       ---               d       ...       AU           d
------------------ ------------- ... ------------- ------------
433 Eros (1898 DQ) 2458133.33546 ... 1.78244263804 642.93873484
ephemerides(*args, **kwargs)

Queries the service and returns a table object.

Query JPL Horizons for ephemerides. The location parameter in HorizonsClass refers in this case to the location of the observer.

The following tables list the values queried, their definitions, data types, units, and original Horizons designations (where available). For more information on the definitions of these quantities, please refer to the Horizons User Manual.

Column Name

Definition

targetname

official number, name, designation (string)

H

absolute magnitude in V band (float, mag)

G

photometric slope parameter (float)

M1

comet total abs mag (float, mag, M1)

M2

comet nuclear abs mag (float, mag, M2)

k1

total mag scaling factor (float, k1)

k2

nuclear mag scaling factor (float, k2)

phasecoeff

comet phase coeff (float, mag/deg, PHCOFF)

datetime

epoch (str, Date__(UT)__HR:MN:SC.fff)

datetime_jd

epoch Julian Date (float, Date_________JDUT)

solar_presence

information on Sun’s presence (str)

flags

information on Moon, target status (str)

RA

target RA (float, deg, DEC_(XXX))

DEC

target DEC (float, deg, DEC_(XXX))

RA_app

target apparent RA (float, deg, R.A._(a-app))

DEC_app

target apparent DEC (float, deg, DEC_(a-app))

RA_rate

target rate RA (float, arcsec/hr, RA*cosD)

DEC_rate

target RA (float, arcsec/hr, d(DEC)/dt)

AZ

Azimuth (float, deg, EoN, Azi_(a-app))

EL

Elevation (float, deg, Elev_(a-app))

AZ_rate

Azimuth rate (float, arcsec/minute, dAZ*cosE)

EL_rate

Elevation rate (float, arcsec/minute, d(ELV)/dt)

sat_X

satellite X position (arcsec, X_(sat-prim))

sat_Y

satellite Y position (arcsec, Y_(sat-prim))

sat_PANG

satellite position angle (deg, SatPANG)

siderealtime

local apparent sidereal time (str, L_Ap_Sid_Time)

airmass

target optical airmass (float, a-mass)

magextinct

V-mag extinction (float, mag, mag_ex)

V

V magnitude (float, mag, APmag)

Tmag

comet Total magnitude (float, mag, T-mag)

Nmag

comet Nucleaus magnitude (float, mag, N-mag)

surfbright

surf brightness (float, mag/arcsec^2, S-brt)

illumination

frac of illumination (float, percent, Illu%)

illum_defect

Defect of illumination (float, arcsec, Dec_illu)

sat_sep

Target-primary angular separation (float, arcsec, ang-sep)

sat_vis

Target-primary visibility (str, v)

ang_width

Angular width of target (float, arcsec, Ang-diam)

PDObsLon

Apparent planetodetic longitude (float, deg, Ob-lon)

PDObsLat

Apparent planetodetic latitude (float, deg, Ob-lat)

PDSunLon

Apparent planetodetic longitude of the Sun (float, deg, Sl-lon)

PDSunLat

Apparent planetodetic latitude of the Sun (float, deg, Sl-lat)

SubSol_ang

Target sub-solar point position angle (float, deg, SN.ang)

SubSol_dist

Target sub-solar point position angle distance (float, arcsec, SN.dist)

NPole_ang

Target’s North Pole position angle (float, deg, NP.ang)

NPole_dist

Target’s North Pole position angle distance (float, arcsec, NP.dist)

EclLon

heliocentr ecl long (float, deg, hEcl-Lon)

EclLat

heliocentr ecl lat (float, deg, hEcl-Lat)

ObsEclLon

obscentr ecl long (float, deg, ObsEcLon)

ObsEclLat

obscentr ecl lat (float, deg, ObsEcLat)

r

heliocentric distance (float, au, r)

r_rate

heliocentric radial rate (float, km/s, rdot)

delta

distance from observer (float, au, delta)

delta_rate

obs-centric rad rate (float, km/s, deldot)

lighttime

one-way light time (float, min, 1-way_LT)

vel_sun

Target center velocity wrt Sun (float, km/s, VmagSn)

vel_obs

Target center velocity wrt Observer (float, km/s, VmagOb)

elong

solar elongation (float, deg, S-O-T)

elongFlag

app. position relative to Sun (str, /r)

alpha

solar phase angle (float, deg, S-T-O)

lunar_elong

Apparent lunar elongation angle wrt target (float, deg, T-O-M)

lunar_illum

Lunar illumination percentage (float, percent, MN_Illu%)

IB_elong

Apparent interfering body elongation angle wrt target (float, deg, T-O-I)

IB_illum

Interfering body illumination percentage (float, percent, IB_Illu%)

sat_alpha

Observer-Primary-Target angle (float, deg, O-P-T)

OrbPlaneAng

orbital plane angle (float, deg, PlAng)

sunTargetPA

-Sun vector PA (float, deg, EoN, PsAng)

velocityPA

-velocity vector PA (float, deg, EoN, PsAMV)

constellation

constellation ID containing target (str, Cnst)

TDB-UT

difference between TDB and UT (float, seconds, TDB-UT)

NPole_RA

Target’s North Pole RA (float, deg, N.Pole-RA)

NPole_DEC

Target’s North Pole DEC (float, deg, N.Pole-DC)

GlxLon

galactic longitude (float, deg, GlxLon)

GlxLat

galactic latitude (float, deg, GlxLat)

solartime

local apparent solar time (string, L_Ap_SOL_Time)

earth_lighttime

observer lighttime from center of Earth (float, minutes, 399_ins_LT

RA_3sigma

3 sigma positional uncertainty in RA (float, arcsec, RA_3sigma)

DEC_3sigma

3 sigma positional uncertainty in DEC (float, arcsec, DEC_3sigma)

SMAA_3sigma

3sig pos unc error ellipse semi-major axis (float, arcsec, SMAA_3sig)

SMIA_3sigma

3sig pos unc error ellipse semi-minor axis (float, arcsec, SMIA_3sig)

Theta_3sigma

pos unc error ellipse position angle (float, deg, Theta)

Area_3sigma

3sig pos unc error ellipse are (float, arcsec^2, Area_3sig)

RSS_3sigma

3sig pos unc error ellipse root-sum-square (float, arcsec, POS_3sigma)

r_3sigma

3sig range uncertainty (float, km, RNG_3sigma)

r_rate_3sigma

3sig range rate uncertainty (float, km/second, RNGRT_3sigma)

SBand_3sigma

3sig Doppler radar uncertainties at S-band (float, Hertz, DOP_S_3sig)

XBand_3sigma

3sig Doppler radar uncertainties at X-band (float, Hertz, DOP_X_3sig)

DoppDelay_3sigma

3sig Doppler radar round-trip delay unc (float, second, RT_delay_3sig)

true_anom

True Anomaly (float, deg, Tru_Anom)

hour_angle

local apparent hour angle (string, sexagesimal angular hours, L_Ap_Hour_Ang)

alpha_true

true phase angle (float, deg, phi)

PABLon

phase angle bisector longitude (float, deg, PAB-LON)

PABLat

phase angle bisector latitude (float, deg, PAB-LAT)

Parameters
airmass_lessthanfloat, optional

Defines a maximum airmass for the query, default: 99

solar_elongationtuple, optional

Permissible solar elongation range: (minimum, maximum); default: (0,180)

max_hour_anglefloat, optional

Defines a maximum hour angle for the query, default: 0

rate_cutofffloat, optional

Angular range rate upper limit cutoff in arcsec/h; default: disabled

skip_daylightboolean, optional

Crop daylight epochs in query, default: False

refractionboolean

If True, coordinates account for a standard atmosphere refraction model; if False, coordinates do not account for refraction (airless model); default: False

refsystemstring

Coordinate reference system: 'J2000' or 'B1950'; default: 'J2000'

closest_apparitionboolean, optional

Only applies to comets. This option will choose the closest apparition available in time to the selected epoch; default: False. Do not use this option for non-cometary objects.

no_fragmentsboolean, optional

Only applies to comets. Reject all comet fragments from selection; default: False. Do not use this option for non-cometary objects.

quantitiesinteger or string, optional

Single integer or comma-separated list in the form of a string corresponding to all the quantities to be queried from JPL Horizons using the coding according to the JPL Horizons User Manual Definition of Observer Table Quantities; default: all quantities

get_query_payloadboolean, optional

When set to True the method returns the HTTP request parameters as a dict, default: False

get_raw_responseboolean, optional

Return raw data as obtained by JPL Horizons without parsing the data into a table, default: False

extra_precisionboolean, optional

Enables extra precision in RA and DEC values; default: False

Returns
tableA Table object.

Examples

>>> from astroquery.jplhorizons import Horizons
>>> obj = Horizons(id='Ceres', location='568',
...             epochs={'start':'2010-01-01',
...                     'stop':'2010-03-01',
...                     'step':'10d'})
>>> eph = obj.ephemerides() 
>>> print(eph) 
targetname    datetime_str   datetime_jd ...   GlxLat  RA_3sigma
DEC_3sigma
   ---            ---             d      ...    deg      arcsec
arcsec
---------- ----------------- ----------- ... --------- ---------
----------
   1 Ceres 2010-Jan-01 00:00   2455197.5 ... 24.120057       0.0
0.0
   1 Ceres 2010-Jan-11 00:00   2455207.5 ... 20.621496       0.0
0.0
   1 Ceres 2010-Jan-21 00:00   2455217.5 ... 17.229529       0.0
0.0
   1 Ceres 2010-Jan-31 00:00   2455227.5 ...  13.97264       0.0
0.0
   1 Ceres 2010-Feb-10 00:00   2455237.5 ... 10.877201       0.0
0.0
   1 Ceres 2010-Feb-20 00:00   2455247.5 ...  7.976737       0.0
0.0
ephemerides_async(airmass_lessthan=99, solar_elongation=(0, 180), max_hour_angle=0, rate_cutoff=None, skip_daylight=False, refraction=False, refsystem='J2000', closest_apparition=False, no_fragments=False, quantities='1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43', get_query_payload=False, get_raw_response=False, cache=True, extra_precision=False)[source]

Query JPL Horizons for ephemerides. The location parameter in HorizonsClass refers in this case to the location of the observer.

The following tables list the values queried, their definitions, data types, units, and original Horizons designations (where available). For more information on the definitions of these quantities, please refer to the Horizons User Manual.

Column Name

Definition

targetname

official number, name, designation (string)

H

absolute magnitude in V band (float, mag)

G

photometric slope parameter (float)

M1

comet total abs mag (float, mag, M1)

M2

comet nuclear abs mag (float, mag, M2)

k1

total mag scaling factor (float, k1)

k2

nuclear mag scaling factor (float, k2)

phasecoeff

comet phase coeff (float, mag/deg, PHCOFF)

datetime

epoch (str, Date__(UT)__HR:MN:SC.fff)

datetime_jd

epoch Julian Date (float, Date_________JDUT)

solar_presence

information on Sun’s presence (str)

flags

information on Moon, target status (str)

RA

target RA (float, deg, DEC_(XXX))

DEC

target DEC (float, deg, DEC_(XXX))

RA_app

target apparent RA (float, deg, R.A._(a-app))

DEC_app

target apparent DEC (float, deg, DEC_(a-app))

RA_rate

target rate RA (float, arcsec/hr, RA*cosD)

DEC_rate

target RA (float, arcsec/hr, d(DEC)/dt)

AZ

Azimuth (float, deg, EoN, Azi_(a-app))

EL

Elevation (float, deg, Elev_(a-app))

AZ_rate

Azimuth rate (float, arcsec/minute, dAZ*cosE)

EL_rate

Elevation rate (float, arcsec/minute, d(ELV)/dt)

sat_X

satellite X position (arcsec, X_(sat-prim))

sat_Y

satellite Y position (arcsec, Y_(sat-prim))

sat_PANG

satellite position angle (deg, SatPANG)

siderealtime

local apparent sidereal time (str, L_Ap_Sid_Time)

airmass

target optical airmass (float, a-mass)

magextinct

V-mag extinction (float, mag, mag_ex)

V

V magnitude (float, mag, APmag)

Tmag

comet Total magnitude (float, mag, T-mag)

Nmag

comet Nucleaus magnitude (float, mag, N-mag)

surfbright

surf brightness (float, mag/arcsec^2, S-brt)

illumination

frac of illumination (float, percent, Illu%)

illum_defect

Defect of illumination (float, arcsec, Dec_illu)

sat_sep

Target-primary angular separation (float, arcsec, ang-sep)

sat_vis

Target-primary visibility (str, v)

ang_width

Angular width of target (float, arcsec, Ang-diam)

PDObsLon

Apparent planetodetic longitude (float, deg, Ob-lon)

PDObsLat

Apparent planetodetic latitude (float, deg, Ob-lat)

PDSunLon

Apparent planetodetic longitude of the Sun (float, deg, Sl-lon)

PDSunLat

Apparent planetodetic latitude of the Sun (float, deg, Sl-lat)

SubSol_ang

Target sub-solar point position angle (float, deg, SN.ang)

SubSol_dist

Target sub-solar point position angle distance (float, arcsec, SN.dist)

NPole_ang

Target’s North Pole position angle (float, deg, NP.ang)

NPole_dist

Target’s North Pole position angle distance (float, arcsec, NP.dist)

EclLon

heliocentr ecl long (float, deg, hEcl-Lon)

EclLat

heliocentr ecl lat (float, deg, hEcl-Lat)

ObsEclLon

obscentr ecl long (float, deg, ObsEcLon)

ObsEclLat

obscentr ecl lat (float, deg, ObsEcLat)

r

heliocentric distance (float, au, r)

r_rate

heliocentric radial rate (float, km/s, rdot)

delta

distance from observer (float, au, delta)

delta_rate

obs-centric rad rate (float, km/s, deldot)

lighttime

one-way light time (float, min, 1-way_LT)

vel_sun

Target center velocity wrt Sun (float, km/s, VmagSn)

vel_obs

Target center velocity wrt Observer (float, km/s, VmagOb)

elong

solar elongation (float, deg, S-O-T)

elongFlag

app. position relative to Sun (str, /r)

alpha

solar phase angle (float, deg, S-T-O)

lunar_elong

Apparent lunar elongation angle wrt target (float, deg, T-O-M)

lunar_illum

Lunar illumination percentage (float, percent, MN_Illu%)

IB_elong

Apparent interfering body elongation angle wrt target (float, deg, T-O-I)

IB_illum

Interfering body illumination percentage (float, percent, IB_Illu%)

sat_alpha

Observer-Primary-Target angle (float, deg, O-P-T)

OrbPlaneAng

orbital plane angle (float, deg, PlAng)

sunTargetPA

-Sun vector PA (float, deg, EoN, PsAng)

velocityPA

-velocity vector PA (float, deg, EoN, PsAMV)

constellation

constellation ID containing target (str, Cnst)

TDB-UT

difference between TDB and UT (float, seconds, TDB-UT)

NPole_RA

Target’s North Pole RA (float, deg, N.Pole-RA)

NPole_DEC

Target’s North Pole DEC (float, deg, N.Pole-DC)

GlxLon

galactic longitude (float, deg, GlxLon)

GlxLat

galactic latitude (float, deg, GlxLat)

solartime

local apparent solar time (string, L_Ap_SOL_Time)

earth_lighttime

observer lighttime from center of Earth (float, minutes, 399_ins_LT

RA_3sigma

3 sigma positional uncertainty in RA (float, arcsec, RA_3sigma)

DEC_3sigma

3 sigma positional uncertainty in DEC (float, arcsec, DEC_3sigma)

SMAA_3sigma

3sig pos unc error ellipse semi-major axis (float, arcsec, SMAA_3sig)

SMIA_3sigma

3sig pos unc error ellipse semi-minor axis (float, arcsec, SMIA_3sig)

Theta_3sigma

pos unc error ellipse position angle (float, deg, Theta)

Area_3sigma

3sig pos unc error ellipse are (float, arcsec^2, Area_3sig)

RSS_3sigma

3sig pos unc error ellipse root-sum-square (float, arcsec, POS_3sigma)

r_3sigma

3sig range uncertainty (float, km, RNG_3sigma)

r_rate_3sigma

3sig range rate uncertainty (float, km/second, RNGRT_3sigma)

SBand_3sigma

3sig Doppler radar uncertainties at S-band (float, Hertz, DOP_S_3sig)

XBand_3sigma

3sig Doppler radar uncertainties at X-band (float, Hertz, DOP_X_3sig)

DoppDelay_3sigma

3sig Doppler radar round-trip delay unc (float, second, RT_delay_3sig)

true_anom

True Anomaly (float, deg, Tru_Anom)

hour_angle

local apparent hour angle (string, sexagesimal angular hours, L_Ap_Hour_Ang)

alpha_true

true phase angle (float, deg, phi)

PABLon

phase angle bisector longitude (float, deg, PAB-LON)

PABLat

phase angle bisector latitude (float, deg, PAB-LAT)

Parameters
airmass_lessthanfloat, optional

Defines a maximum airmass for the query, default: 99

solar_elongationtuple, optional

Permissible solar elongation range: (minimum, maximum); default: (0,180)

max_hour_anglefloat, optional

Defines a maximum hour angle for the query, default: 0

rate_cutofffloat, optional

Angular range rate upper limit cutoff in arcsec/h; default: disabled

skip_daylightboolean, optional

Crop daylight epochs in query, default: False

refractionboolean

If True, coordinates account for a standard atmosphere refraction model; if False, coordinates do not account for refraction (airless model); default: False

refsystemstring

Coordinate reference system: 'J2000' or 'B1950'; default: 'J2000'

closest_apparitionboolean, optional

Only applies to comets. This option will choose the closest apparition available in time to the selected epoch; default: False. Do not use this option for non-cometary objects.

no_fragmentsboolean, optional

Only applies to comets. Reject all comet fragments from selection; default: False. Do not use this option for non-cometary objects.

quantitiesinteger or string, optional

Single integer or comma-separated list in the form of a string corresponding to all the quantities to be queried from JPL Horizons using the coding according to the JPL Horizons User Manual Definition of Observer Table Quantities; default: all quantities

get_query_payloadboolean, optional

When set to True the method returns the HTTP request parameters as a dict, default: False

get_raw_responseboolean, optional

Return raw data as obtained by JPL Horizons without parsing the data into a table, default: False

extra_precisionboolean, optional

Enables extra precision in RA and DEC values; default: False

Returns
responserequests.Response

The response of the HTTP request.

Examples

>>> from astroquery.jplhorizons import Horizons
>>> obj = Horizons(id='Ceres', location='568',
...             epochs={'start':'2010-01-01',
...                     'stop':'2010-03-01',
...                     'step':'10d'})
>>> eph = obj.ephemerides() 
>>> print(eph) 
targetname    datetime_str   datetime_jd ...   GlxLat  RA_3sigma
DEC_3sigma
   ---            ---             d      ...    deg      arcsec
arcsec
---------- ----------------- ----------- ... --------- ---------
----------
   1 Ceres 2010-Jan-01 00:00   2455197.5 ... 24.120057       0.0
0.0
   1 Ceres 2010-Jan-11 00:00   2455207.5 ... 20.621496       0.0
0.0
   1 Ceres 2010-Jan-21 00:00   2455217.5 ... 17.229529       0.0
0.0
   1 Ceres 2010-Jan-31 00:00   2455227.5 ...  13.97264       0.0
0.0
   1 Ceres 2010-Feb-10 00:00   2455237.5 ... 10.877201       0.0
0.0
   1 Ceres 2010-Feb-20 00:00   2455247.5 ...  7.976737       0.0
0.0
vectors(*args, **kwargs)

Queries the service and returns a table object.

Query JPL Horizons for state vectors. The location parameter in HorizonsClass refers in this case to the center body relative to which the vectors are provided.

The following table lists the values queried, their definitions, data types, units, and original Horizons designations (where available). For more information on the definitions of these quantities, please refer to the Horizons User Manual.

Column Name

Definition

targetname

official number, name, designation (string)

H

absolute magnitude in V band (float, mag)

G

photometric slope parameter (float)

M1

comet total abs mag (float, mag, M1)

M2

comet nuclear abs mag (float, mag, M2)

k1

total mag scaling factor (float, k1)

k2

nuclear mag scaling factor (float, k2)

phasecoeff

comet phase coeff (float, mag/deg, PHCOFF)

datetime_str

epoch Date (str, Calendar Date (TDB))

datetime_jd

epoch Julian Date (float, JDTDB)

delta_T

time-varying difference between TDB and UT (float, delta-T, optional)

x

x-component of position vector (float, au, X)

y

y-component of position vector (float, au, Y)

z

z-component of position vector (float, au, Z)

vx

x-component of velocity vector (float, au/d, VX)

vy

y-component of velocity vector (float, au/d, VY)

vz

z-component of velocity vector (float, au/d, VZ)

lighttime

one-way lighttime (float, d, LT)

range

range from coordinate center (float, au, RG)

range_rate

range rate (float, au/d, RR)

Parameters
closest_apparitionboolean, optional

Only applies to comets. This option will choose the closest apparition available in time to the selected epoch; default: False. Do not use this option for non-cometary objects.

no_fragmentsboolean, optional

Only applies to comets. Reject all comet fragments from selection; default: False. Do not use this option for non-cometary objects.

get_query_payloadboolean, optional

When set to True the method returns the HTTP request parameters as a dict, default: False

get_raw_response: boolean, optional

Return raw data as obtained by JPL Horizons without parsing the data into a table, default: False

refplanestring

Reference plane for all output quantities: 'ecliptic' (ecliptic and mean equinox of reference epoch), 'earth' (Earth mean equator and equinox of reference epoch), or 'body' (body mean equator and node of date); default: 'ecliptic'

aberrationsstring, optional

Aberrations to be accounted for: ['geometric', 'astrometric', 'apparent']. Default: 'geometric'

delta_Tboolean, optional

Triggers output of time-varying difference between TDB and UT time-scales. Default: False

Returns
tableA Table object.

Examples

>>> from astroquery.jplhorizons import Horizons
>>> obj = Horizons(id='2012 TC4', location='257',
...             epochs={'start':'2017-10-01',
...                     'stop':'2017-10-02',
...                     'step':'10m'})
>>> vec = obj.vectors() 
>>> print(vec) 
targetname  datetime_jd  ...      range          range_rate
   ---           d       ...        AU             AU / d
---------- ------------- ... --------------- -----------------
(2012 TC4)     2458027.5 ... 0.0429332099306 -0.00408018711862
(2012 TC4) 2458027.50694 ... 0.0429048742906 -0.00408040726527
(2012 TC4) 2458027.51389 ... 0.0428765385796 -0.00408020747595
(2012 TC4) 2458027.52083 ... 0.0428482057142  -0.0040795878561
(2012 TC4) 2458027.52778 ...  0.042819878607 -0.00407854931543
(2012 TC4) 2458027.53472 ... 0.0427915601617  -0.0040770935665
       ...           ... ...             ...               ...
(2012 TC4) 2458028.45833 ... 0.0392489462501 -0.00405496595173
(2012 TC4) 2458028.46528 ...   0.03922077771 -0.00405750632914
(2012 TC4) 2458028.47222 ...  0.039192592935 -0.00405964084539
(2012 TC4) 2458028.47917 ...  0.039164394759 -0.00406136516755
(2012 TC4) 2458028.48611 ... 0.0391361860433 -0.00406267574646
(2012 TC4) 2458028.49306 ... 0.0391079696711  -0.0040635698239
(2012 TC4)     2458028.5 ... 0.0390797485422 -0.00406404543822
Length = 145 rows
vectors_async(get_query_payload=False, closest_apparition=False, no_fragments=False, get_raw_response=False, cache=True, refplane='ecliptic', aberrations='geometric', delta_T=False)[source]

Query JPL Horizons for state vectors. The location parameter in HorizonsClass refers in this case to the center body relative to which the vectors are provided.

The following table lists the values queried, their definitions, data types, units, and original Horizons designations (where available). For more information on the definitions of these quantities, please refer to the Horizons User Manual.

Column Name

Definition

targetname

official number, name, designation (string)

H

absolute magnitude in V band (float, mag)

G

photometric slope parameter (float)

M1

comet total abs mag (float, mag, M1)

M2

comet nuclear abs mag (float, mag, M2)

k1

total mag scaling factor (float, k1)

k2

nuclear mag scaling factor (float, k2)

phasecoeff

comet phase coeff (float, mag/deg, PHCOFF)

datetime_str

epoch Date (str, Calendar Date (TDB))

datetime_jd

epoch Julian Date (float, JDTDB)

delta_T

time-varying difference between TDB and UT (float, delta-T, optional)

x

x-component of position vector (float, au, X)

y

y-component of position vector (float, au, Y)

z

z-component of position vector (float, au, Z)

vx

x-component of velocity vector (float, au/d, VX)

vy

y-component of velocity vector (float, au/d, VY)

vz

z-component of velocity vector (float, au/d, VZ)

lighttime

one-way lighttime (float, d, LT)

range

range from coordinate center (float, au, RG)

range_rate

range rate (float, au/d, RR)

Parameters
closest_apparitionboolean, optional

Only applies to comets. This option will choose the closest apparition available in time to the selected epoch; default: False. Do not use this option for non-cometary objects.

no_fragmentsboolean, optional

Only applies to comets. Reject all comet fragments from selection; default: False. Do not use this option for non-cometary objects.

get_query_payloadboolean, optional

When set to True the method returns the HTTP request parameters as a dict, default: False

get_raw_response: boolean, optional

Return raw data as obtained by JPL Horizons without parsing the data into a table, default: False

refplanestring

Reference plane for all output quantities: 'ecliptic' (ecliptic and mean equinox of reference epoch), 'earth' (Earth mean equator and equinox of reference epoch), or 'body' (body mean equator and node of date); default: 'ecliptic'

aberrationsstring, optional

Aberrations to be accounted for: ['geometric', 'astrometric', 'apparent']. Default: 'geometric'

delta_Tboolean, optional

Triggers output of time-varying difference between TDB and UT time-scales. Default: False

Returns
responserequests.Response

The response of the HTTP request.

Examples

>>> from astroquery.jplhorizons import Horizons
>>> obj = Horizons(id='2012 TC4', location='257',
...             epochs={'start':'2017-10-01',
...                     'stop':'2017-10-02',
...                     'step':'10m'})
>>> vec = obj.vectors() 
>>> print(vec) 
targetname  datetime_jd  ...      range          range_rate
   ---           d       ...        AU             AU / d
---------- ------------- ... --------------- -----------------
(2012 TC4)     2458027.5 ... 0.0429332099306 -0.00408018711862
(2012 TC4) 2458027.50694 ... 0.0429048742906 -0.00408040726527
(2012 TC4) 2458027.51389 ... 0.0428765385796 -0.00408020747595
(2012 TC4) 2458027.52083 ... 0.0428482057142  -0.0040795878561
(2012 TC4) 2458027.52778 ...  0.042819878607 -0.00407854931543
(2012 TC4) 2458027.53472 ... 0.0427915601617  -0.0040770935665
       ...           ... ...             ...               ...
(2012 TC4) 2458028.45833 ... 0.0392489462501 -0.00405496595173
(2012 TC4) 2458028.46528 ...   0.03922077771 -0.00405750632914
(2012 TC4) 2458028.47222 ...  0.039192592935 -0.00405964084539
(2012 TC4) 2458028.47917 ...  0.039164394759 -0.00406136516755
(2012 TC4) 2458028.48611 ... 0.0391361860433 -0.00406267574646
(2012 TC4) 2458028.49306 ... 0.0391079696711  -0.0040635698239
(2012 TC4)     2458028.5 ... 0.0390797485422 -0.00406404543822
Length = 145 rows