{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T05:39:20.258Z","years_from_j2000":26.677,"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":"gj-317-c","name":"GJ 317 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":49.56533240885806,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":130.2445254,"dec_deg":-23.452809,"epoch_ra_deg":130.538498,"epoch_dec_deg":-23.547962,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 317","semi_major_axis_km":753973268.328,"periapsis_km":null,"mass_kg":2.714318177652111e+27,"mass_msun":0.00136507,"constellation":"Pyxis","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/gj-317-c","radius_km":86742.16,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 317","host_v_mag":12.4,"eccentricity":0.217,"uncertainties":{"mass_kg":[1.0439685295675879e+26,1.1009122680977846e+26],"distance_ly":[0.0420741727254599,0.04240032910317664],"eccentricity":[0.014,0.014],"host_mass_solar":[0.014,0.014],"host_radius_solar":[0.009,0.009],"host_temperature_k":[37,37],"semi_major_axis_km":[14959787.07,14959787.07],"orbital_period_days":[166,169],"argument_of_periastron_deg":[5.3,5.4]},"host_mass_solar":0.402,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.403,"planets_in_system":2,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"M3.5 V","host_temperature_k":3496,"orbital_period_days":6500,"periastron_epoch_bjd":2449804.6,"transit_midpoint_bjd":2462735,"equilibrium_temperature_k":47.67,"argument_of_periastron_deg":106.7},"designations":[{"catalog":"Exoplanet","designation":"GJ 317 c"}],"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."}