{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.688","julian_year":2026.688,"time":"2026-09-09T06:10:42.849Z","years_from_j2000":26.688,"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":"2mass-j0249-0557-c","name":"2MASS J0249-0557 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":215.46314315259102,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":42.4851627,"dec_deg":-5.9599921,"epoch_ra_deg":42.819173,"epoch_dec_deg":-5.848385,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"2MASS J0249-0557 A","semi_major_axis_km":291715847865,"periapsis_km":null,"mass_kg":2.1600657945231482e+28,"mass_msun":0.0108633,"constellation":"Eridanus","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/2mass-j0249-0557-c","radius_km":110812.599726029,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"2MASS J0249-0557 A","host_v_mag":18.3,"uncertainties":{"mass_kg":[1.461555941812675e+27,1.461555941812675e+27],"radius_km":[2144.759987702,2144.759987702],"distance_ly":[1.461832884926444,1.4817284239671653],"host_mass_solar":[0.011,0.012],"host_radius_solar":[0.009624,0.009624],"host_temperature_k":[157,157],"semi_major_axis_km":[29919574139.999996,29919574139.999996]},"host_mass_solar":0.046,"stars_in_system":2,"discovery_method":"Imaging","host_radius_solar":0.315959,"planets_in_system":1,"discovery_facility":"Mauna Kea Observatory","host_spectral_type":"M6 V","host_temperature_k":2859,"equilibrium_temperature_k":1723},"designations":[{"catalog":"Exoplanet","designation":"2MASS J0249-0557 c"},{"catalog":"Host star","designation":"2MASS J0249-0557 A"}],"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."}