{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T16:50:31.553Z","years_from_j2000":26.684,"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":"toi-178-b","name":"TOI-178 b","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":204.49678726462096,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":7.3020115,"dec_deg":-30.4541159,"epoch_ra_deg":7.636216,"epoch_dec_deg":-30.305502,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-178","semi_major_axis_km":3900016.4891489996,"periapsis_km":null,"mass_kg":5.733281153079724e+24,"mass_msun":0.00000288335,"constellation":"Sculptor","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/toi-178-b","radius_km":7653.72,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-178","host_v_mag":11.955,"uncertainties":{"mass_kg":[3.8819091140643965e+24,4.1805175074539655e+24],"radius_km":[235.9897,261.50210000000004],"distance_ly":[0.6722082944742082,0.6764483273845259],"host_mass_solar":[0.029,0.03],"inclination_deg":[1.3,0.8],"host_radius_solar":[0.01,0.01],"host_temperature_k":[70,70],"semi_major_axis_km":[116686.33914599998,116686.33914599998],"orbital_period_days":[0.0000029,0.0000044]},"host_mass_solar":0.647,"inclination_deg":88.8,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.662,"planets_in_system":6,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"K","host_temperature_k":4316,"orbital_period_days":1.9145601,"transit_midpoint_bjd":2458931.1793,"equilibrium_temperature_k":1040},"designations":[{"catalog":"Exoplanet","designation":"TOI-178 b"},{"catalog":"Host star","designation":"TOI-178"}],"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."}