{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T04:45:50.715Z","years_from_j2000":26.682,"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-2030-c","name":"GJ 2030 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":120.93487098083587,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":50.8237604,"dec_deg":-7.7950429,"epoch_ra_deg":51.152388,"epoch_dec_deg":-7.699103,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 2030","semi_major_axis_km":2507409910.8026996,"periapsis_km":null,"mass_kg":2.4301689250679324e+28,"mass_msun":0.0122217,"constellation":"Eridanus","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/gj-2030-c","radius_km":78450.63,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 2030","host_v_mag":6.20902,"eccentricity":0.041,"uncertainties":{"mass_kg":[4.0543941450684107e+27,4.432120940402082e+27],"distance_ly":[0.21004470724958277,0.21102317638273296],"eccentricity":[0.008,0.003],"host_mass_solar":[0.125,0.125],"inclination_deg":[2.535,2.935],"host_radius_solar":[0.094059,0.097217],"host_temperature_k":[94.4,103.89],"semi_major_axis_km":[200012353.12589997,193579644.6858],"orbital_period_days":[2322.57168,2549.01187],"argument_of_periastron_deg":[63.431,64.447]},"host_mass_solar":0.96,"inclination_deg":16.999,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":2.24104,"planets_in_system":2,"discovery_facility":"Multiple Observatories","host_temperature_k":5485,"orbital_period_days":25533.11353,"periastron_epoch_bjd":2441013.547,"equilibrium_temperature_k":96.71,"argument_of_periastron_deg":205.126},"designations":[{"catalog":"Exoplanet","designation":"GJ 2030 c"},{"catalog":"Host star","designation":"GJ 2030"}],"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."}