app_geo_from_icrs¶
- rubin_sim.utils.app_geo_from_icrs(ra, dec, pm_ra=None, pm_dec=None, parallax=None, v_rad=None, epoch=2000.0, mjd=None)¶
Convert the mean position (RA, Dec) in the International Celestial Reference System (ICRS) to the mean apparent geocentric position
units: ra (degrees), dec (degrees), pm_ra (arcsec/year), pm_dec (arcsec/year), parallax (arcsec), v_rad (km/sec; positive if receding), epoch (Julian years)
@param [in] ra in degrees (ICRS). Can be a numpy array or a number.
@param [in] dec in degrees (ICRS). Can be a numpy array or a number.
@param [in] pm_ra is ra proper motion multiplied by cos(Dec) in arcsec/year
@param [in] pm_dec is dec proper motion in arcsec/year
@param [in] parallax in arcsec
@param [in] v_rad is radial velocity in km/sec (positive if the object is receding)
@param [in] epoch is the julian epoch (in years) of the equinox against which to measure RA (default: 2000.0)
@param [in] mjd is an instantiation of the ModifiedJulianDate class representing the date of the observation
@param [out] a 2-D numpy array in which the first row is the apparent geocentric RA and the second row is the apparent geocentric Dec (both in degrees)