{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T12:47:40.644Z","years_from_j2000":26.678,"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-2126-b","name":"GJ 2126 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":124.36016525961709,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":257.3606793,"dec_deg":-35.391719,"epoch_ra_deg":257.808302,"epoch_dec_deg":-35.426104,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 2126","semi_major_axis_km":106214488.19699998,"periapsis_km":null,"mass_kg":2.467561979683737e+27,"mass_msun":0.00124097,"constellation":"Scorpius","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/gj-2126-b","radius_km":86742.16,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 2126","host_v_mag":10.7,"eccentricity":0.85,"uncertainties":{"mass_kg":[1.8981245997567207e+26,3.7962491995134415e+26],"distance_ly":[0.3806244927954396,0.3832337438171735],"eccentricity":[0.01,0.01],"host_mass_solar":[0.075,0.092],"host_radius_solar":[0.078,0.064],"host_temperature_k":[129,129],"semi_major_axis_km":[4487936.120999999,4487936.120999999],"orbital_period_days":[0.1,0.1],"argument_of_periastron_deg":[1,1]},"host_mass_solar":0.65,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.728,"planets_in_system":1,"discovery_facility":"La Silla Observatory","host_spectral_type":"M0 V","host_temperature_k":4159,"orbital_period_days":272.7,"periastron_epoch_bjd":2453371,"equilibrium_temperature_k":203.08,"argument_of_periastron_deg":10},"designations":[{"catalog":"Exoplanet","designation":"GJ 2126 b"},{"catalog":"Host star","designation":"GJ 2126"}],"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."}