{"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":"2026-09-05T07:21:45.172Z","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":"ross-458-c","name":"Ross 458 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":37.53864213693087,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":195.1912147,"dec_deg":12.3755996,"epoch_ra_deg":195.5272,"epoch_dec_deg":12.230804,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Ross 458","semi_major_axis_km":164557657770,"periapsis_km":null,"mass_kg":1.1388804680520804e+28,"mass_msun":0.00572759,"constellation":"Virgo","discovered":"2010","featured":false,"url":"https://spacecatalog.org/object/ross-458-c","radius_km":89365.153625,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Ross 458","host_v_mag":9.76,"uncertainties":{"distance_ly":[0.06604666648764054,0.06604666648764054],"host_mass_solar":[0.020159,0.020159],"host_radius_solar":[0.016511,0.016511],"host_temperature_k":[150.75,89.23]},"host_mass_solar":0.556419,"stars_in_system":2,"discovery_method":"Imaging","host_radius_solar":0.562566,"planets_in_system":1,"discovery_facility":"Las Campanas Observatory","host_spectral_type":"M2","host_temperature_k":3965.42,"equilibrium_temperature_k":4.32},"designations":[{"catalog":"Exoplanet","designation":"Ross 458 c"},{"catalog":"Host star","designation":"Ross 458"}],"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."}