{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T14:36:53.816Z","years_from_j2000":26.683,"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-198-b","name":"TOI-198 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":77.38451448982997,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":2.2715087,"dec_deg":-27.1217452,"epoch_ra_deg":2.613688,"epoch_dec_deg":-26.972202,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-198","semi_major_axis_km":10097856.27225,"periapsis_km":null,"mass_kg":1.893177214089867e+25,"mass_msun":0.00000952106,"constellation":"Sculptor","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/toi-198-b","radius_km":8674.216,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-198","host_v_mag":11.688,"uncertainties":{"mass_kg":[3.8819091140643965e+24,3.8221874353864827e+24],"radius_km":[829.153,829.153],"distance_ly":[0.08659451828379539,0.08659451828379539],"host_mass_solar":[0.045,0.045],"inclination_deg":[0.32,0.24],"host_radius_solar":[0.029,0.029],"host_temperature_k":[100,100],"semi_major_axis_km":[1226702.53974,1002305.7336899999],"orbital_period_days":[0.00001,0.000011]},"host_mass_solar":0.417,"inclination_deg":89.63,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.418,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"M0 V","host_temperature_k":3801,"orbital_period_days":10.215213,"periastron_epoch_bjd":2458356.37313,"transit_midpoint_bjd":2459480.048,"eccentricity_upper_limit":0.15,"equilibrium_temperature_k":456,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"TOI-198 b"},{"catalog":"Host star","designation":"TOI-198"}],"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."}