{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T21:18:32.462Z","years_from_j2000":26.673,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"bd-210397-b","name":"BD-210397 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":77.40473618524841,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":33.3024198,"dec_deg":-21.1962147,"epoch_ra_deg":33.615367,"epoch_dec_deg":-21.070227,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"BD-210397","semi_major_axis_km":393442399.9409999,"periapsis_km":null,"mass_kg":1.278043923707355e+27,"mass_msun":0.000642747,"constellation":"Cetus","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/bd-210397-b","radius_km":89293.40000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"BD-210397","host_v_mag":9.84,"eccentricity":0.1,"uncertainties":{"mass_kg":[1.9110937176932413e+26,1.8513720390153276e+26],"distance_ly":[0.07403749774170076,0.0743636541194175],"eccentricity":[0.1,0.1],"host_mass_solar":[0.017,0.017],"host_radius_solar":[0.088,0.088],"host_temperature_k":[239,239],"semi_major_axis_km":[7479893.535,8975872.241999999],"orbital_period_days":[48,56],"argument_of_periastron_deg":[61,39]},"host_mass_solar":0.679,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.747,"planets_in_system":2,"discovery_facility":"La Silla Observatory","host_spectral_type":"K7 V","host_temperature_k":4051,"orbital_period_days":1891,"periastron_epoch_bjd":2456490,"equilibrium_temperature_k":104.11,"argument_of_periastron_deg":-55},"designations":[{"catalog":"Exoplanet","designation":"BD-210397 b"}],"source":{"id":"exoplanet_archive","name":"NASA Exoplanet Archive (Planetary Systems Composite Parameters)","url":"https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=PSCompPars","license":"Public domain (NASA)"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}