pint.solar_system_ephemerides.get_tdb_tt_ephem_geocenter

pint.solar_system_ephemerides.get_tdb_tt_ephem_geocenter(tt: Time, ephem: str, path: str | Path | None = None, link: str | None = None) → Quantity[source]

The is a function to read the TDB_TT correction from the JPL DExxxt.bsp ephemeris file.

Parameters:

  • t (Astropy.time.Time object) – Observation time in Astropy.time.Time object format.

  • ephem (str) – The ephem to for computing solar system object position and velocity (without bsp extension)

  • path (str or pathlib.Path, optional) – Local path to the ephemeris file.

  • link (str, optional) – Location of path on the internet.

Returns:

tdb_tt_correction

Return type:

u.Quantity

Note

Only the DEXXXt.bsp type ephemeris has the TDB-TT information, others do not provide it. The definition for TDB-TT column is described in the paper: https://ipnpr.jpl.nasa.gov/progress_report/42-196/196C.pdf page 6.