{"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":"2026-09-05T05:37:20.220Z","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":"toi-201-d","name":"TOI-201 d","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":371.2474969360832,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":87.4017825,"dec_deg":-54.910423,"epoch_ra_deg":87.533467,"epoch_dec_deg":-54.90153,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-201","semi_major_axis_km":10441931.37486,"periapsis_km":null,"mass_kg":3.463857363319e+25,"mass_msun":0.0000174202,"constellation":"Pictor","discovered":"2026","featured":false,"url":"https://spacecatalog.org/object/toi-201-d","radius_km":8865.559,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-201","host_v_mag":9.07,"eccentricity":0.3,"uncertainties":{"mass_kg":[1.1944335735582758e+25,1.1944335735582758e+25],"radius_km":[446.46700000000004,446.46700000000004],"distance_ly":[1.1252395031227647,1.1317626306770996],"eccentricity":[0.1,0.1],"host_mass_solar":[0.04,0.02],"inclination_deg":[1.6,1.6],"host_radius_solar":[0.01,0.01],"host_temperature_k":[90,86],"semi_major_axis_km":[74798.93535,74798.93535],"orbital_period_days":[0.00009,0.00009],"argument_of_periastron_deg":[80,80]},"host_mass_solar":1.32,"inclination_deg":91.7,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.31,"planets_in_system":3,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"F","host_temperature_k":6423,"orbital_period_days":5.84889,"transit_midpoint_bjd":2458374.032,"equilibrium_temperature_k":1237,"argument_of_periastron_deg":340},"designations":[{"catalog":"Exoplanet","designation":"TOI-201 d"}],"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."}