{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T16:20:09.282Z","years_from_j2000":26.681,"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-4552-b","name":"TOI-4552 b","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":88.93762570131246,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":264.7142556,"dec_deg":-47.6370457,"epoch_ra_deg":265.221667,"epoch_dec_deg":-47.652449,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-4552","semi_major_axis_km":841562.82162285,"periapsis_km":null,"mass_kg":1.0929067198058225e+25,"mass_msun":0.00000549639,"constellation":"Ara","discovered":"2026","featured":false,"url":"https://spacecatalog.org/object/toi-4552-b","radius_km":7079.691000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-4552","host_v_mag":14.44,"eccentricity":0,"uncertainties":{"mass_kg":[2.806918897861948e+24,2.806918897861948e+24],"radius_km":[255.12400000000002,255.12400000000002],"distance_ly":[0.16438281436923868,0.16503512712467217],"host_mass_solar":[0.0063,0.0063],"inclination_deg":[1.9,1.94],"host_radius_solar":[0.0088,0.0088],"host_temperature_k":[115,115],"semi_major_axis_km":[44.87936120999999,44.87936120999999],"orbital_period_days":[1.4e-7,1.4e-7]},"host_mass_solar":0.2619,"inclination_deg":87.77,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.2869,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"M4.5 V","host_temperature_k":3258,"orbital_period_days":0.30110032,"transit_midpoint_bjd":2459361.88587913,"equilibrium_temperature_k":1122,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"TOI-4552 b"},{"catalog":"Host star","designation":"TOI-4552"}],"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."}