{"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":"2026-09-07T01:36:25.624Z","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-3473-b","name":"GJ 3473 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":89.25073582392054,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":120.5936065,"dec_deg":3.3371629,"epoch_ra_deg":120.945319,"epoch_dec_deg":3.262618,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 3473","semi_major_axis_km":2377110.165423,"periapsis_km":null,"mass_kg":1.1108232234091965e+25,"mass_msun":0.00000558649,"constellation":"Canis Minor","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/gj-3473-b","radius_km":8061.9184000000005,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 3473","host_v_mag":13.74,"eccentricity":0,"uncertainties":{"mass_kg":[1.7916503603374138e+24,1.7916503603374138e+24],"radius_km":[312.5269,318.90500000000003],"distance_ly":[0.12263479802149553,0.12263479802149553],"host_mass_solar":[0.016,0.016],"inclination_deg":[0.45,0.47],"host_radius_solar":[0.012,0.012],"host_temperature_k":[54,54],"semi_major_axis_km":[92750.679834,92750.679834],"orbital_period_days":[0.0000019,0.0000018]},"host_mass_solar":0.36,"inclination_deg":87.95,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.364,"planets_in_system":2,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"M4","host_temperature_k":3347,"orbital_period_days":1.1980035,"transit_midpoint_bjd":2458492.20408,"equilibrium_temperature_k":773},"designations":[{"catalog":"Exoplanet","designation":"GJ 3473 b"},{"catalog":"Host star","designation":"GJ 3473"}],"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."}