{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T18:48:14.570Z","years_from_j2000":26.684,"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":"hd-82943-c","name":"HD 82943 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":89.98719692480493,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":143.7114034,"dec_deg":-12.1302976,"epoch_ra_deg":144.036217,"epoch_dec_deg":-12.249762,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 82943","semi_major_axis_km":111218536.971915,"periapsis_km":null,"mass_kg":3.718289630990516e+27,"mass_msun":0.00186998,"constellation":"Hydra","discovered":"2003","featured":false,"url":"https://spacecatalog.org/object/hd-82943-c","radius_km":85466.54000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 82943","host_v_mag":6.54993,"eccentricity":0.3663,"uncertainties":{"mass_kg":[8.920627144119983e+25,8.920627144119983e+25],"distance_ly":[0.09458534953785559,0.09491150591557233],"eccentricity":[0.0097,0.0097],"host_mass_solar":[0.147458,0.118905],"host_radius_solar":[0.052954,0.065222],"host_temperature_k":[144.14,124.44],"semi_major_axis_km":[17951.744484,17951.744484],"orbital_period_days":[0.051,0.051],"argument_of_periastron_deg":[1.7,1.7]},"host_mass_solar":1.08,"inclination_deg":90,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.1826,"planets_in_system":2,"discovery_facility":"La Silla Observatory","host_spectral_type":"G2/3V","host_temperature_k":5935,"orbital_period_days":220.078,"periastron_epoch_bjd":2452284,"transit_midpoint_bjd":2455135.17,"equilibrium_temperature_k":360.95,"argument_of_periastron_deg":117.2},"designations":[{"catalog":"Exoplanet","designation":"HD 82943 c"},{"catalog":"Host star","designation":"HD 82943"}],"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."}