sorcha.ephemeris.simulation_parsing

Classes

Observatory

Class containing various utility tools related to the calculation of the observatory position

Functions

mjd_tai_to_epoch(mjd_tai)

Converts a MJD value in TAI to SPICE ephemeris time

parse_orbit_row(row, epochJD_TDB, ephem, sun_dict, ...)

Parses the input orbit row, converting it to the format expected by

get_perihelion_row(row, epochJD_TDB, ephem, ssb_dict, ...)

Parses the input orbit row, computing the perihelion for the maximum

Module Contents

mjd_tai_to_epoch(mjd_tai)[source]

Converts a MJD value in TAI to SPICE ephemeris time

Parameters:

mjd_tai (float) -- Input mjd

Returns:

epoch

Return type:

Ephemeris time

parse_orbit_row(row, epochJD_TDB, ephem, sun_dict, gm_sun, gm_total)[source]

Parses the input orbit row, converting it to the format expected by the ephemeris generation code later on

Parameters:

  • row (Pandas dataframe row) -- Row of the input dataframe

  • epochJD_TDB (float) -- epoch of the elements, in JD TDB

  • ephem (Ephem) -- ASSIST ephemeris object

  • sun_dict (dict) -- Dictionary with the position of the Sun at each epoch

  • gm_sun (float) -- Standard gravitational parameter GM for the Sun

  • gm_total (float) -- Standard gravitational parameter GM for the Solar System barycenter

Returns:

State vector (position, velocity)

Return type:

tuple

get_perihelion_row(row, epochJD_TDB, ephem, ssb_dict, gm_sun, gm_total)[source]

Parses the input orbit row, computing the perihelion for the maximum apparent magnitude filter

Parameters:

  • row (Pandas dataframe row) -- Row of the input dataframe

  • epochJD_TDB (float) -- epoch of the elements, in JD TDB

  • ephem (Ephem) -- ASSIST ephemeris object

  • ssb_dict (dict) -- Dictionary with the position of the Sun at each epoch

  • gm_sun (float) -- Standard gravitational parameter GM for the Sun

  • gm_total (float) -- Standard gravitational parameter GM for the Solar System barycenter

Returns:

Cometary elements (q, e, inc, node, argPeri, Tp (in MJD!))

Return type:

tuple

class Observatory(args, auxconfigs, oc_file=None)[source]

Class containing various utility tools related to the calculation of the observatory position

observatoryPositionCache[source]
ObservatoryXYZ[source]
convert_to_geocentric(obs_location: dict) → tuple[source]

Converts the observatory location to geocentric coordinates

Parameters:

obs_location (dict) -- Dictionary with Longitude and sin/cos of the observatory Latitude

Returns:

Geocentric position (x,y,z)

Return type:

tuple

barycentricObservatory(et, obsCode, Rearth=RADIUS_EARTH_KM)[source]

Computes the barycentric position of the observatory

Parameters:

  • et (float) -- JPL internal ephemeris time

  • obsCode (str) -- MPC Observatory code

  • Rearth (float default=RADIUS_EARTH_KM) -- Radius of the Earth, units[km]

Returns:

Barycentric position of the observatory (x,y,z)

Return type:

array (3,)