{"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":"2026-09-09T04:54:10.069Z","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":"lhs-1478-b","name":"LHS 1478 b","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":59.45047990469712,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":44.3388743,"dec_deg":76.5514045,"epoch_ra_deg":45.118383,"epoch_dec_deg":76.659327,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"LHS 1478","semi_major_axis_km":2764568.650536,"periapsis_km":null,"mass_kg":1.3915151131953915e+25,"mass_msun":0.00000699813,"constellation":"Cassiopeia","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/lhs-1478-b","radius_km":7921.600200000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"LHS 1478","host_v_mag":13.304,"uncertainties":{"mass_kg":[1.1944335735582758e+24,1.1944335735582758e+24],"radius_km":[312.5269,325.2831],"distance_ly":[0.035877201548841775,0.035877201548841775],"host_mass_solar":[0.012,0.012],"inclination_deg":[0.048,0.052],"host_radius_solar":[0.008,0.008],"host_temperature_k":[54,54],"semi_major_axis_km":[94246.658541,91254.701127],"orbital_period_days":[0.0000041,0.000004]},"host_mass_solar":0.236,"inclination_deg":87.452,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.246,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"m3 V","host_temperature_k":3381,"orbital_period_days":1.9495378,"transit_midpoint_bjd":2458786.75425,"equilibrium_temperature_k":595},"designations":[{"catalog":"Exoplanet","designation":"LHS 1478 b"},{"catalog":"Host star","designation":"LHS 1478"}],"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."}