{"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":"2026-09-06T17:54:30.907Z","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-238-c","name":"TOI-238 c","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":262.6886297077092,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":349.2310814,"dec_deg":-18.6066463,"epoch_ra_deg":349.585273,"epoch_dec_deg":-18.460053,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-238","semi_major_axis_km":11204880.515429998,"periapsis_km":null,"mass_kg":4.001352471420224e+25,"mass_msun":0.0000201234,"constellation":"Aquarius","discovered":"2024","featured":false,"url":"https://spacecatalog.org/object/toi-238-c","radius_km":13904.258000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-238","host_v_mag":10.748,"uncertainties":{"mass_kg":[6.569384654570517e+24,6.569384654570517e+24],"radius_km":[1148.058,1148.058],"distance_ly":[0.8659451828379539,0.8714898412591384],"host_mass_solar":[0.022,0.022],"inclination_deg":[0.089,0.089],"host_radius_solar":[0.015,0.015],"host_temperature_k":[89,89],"semi_major_axis_km":[194477.23190999997,194477.23190999997],"orbital_period_days":[0.000035,0.000035]},"host_mass_solar":0.79,"inclination_deg":87.938,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.733,"planets_in_system":2,"discovery_facility":"Multiple Observatories","host_spectral_type":"K2V","host_temperature_k":5059,"orbital_period_days":8.465651,"transit_midpoint_bjd":2460204.9675,"eccentricity_upper_limit":0.36,"equilibrium_temperature_k":696},"designations":[{"catalog":"Exoplanet","designation":"TOI-238 c"},{"catalog":"Host star","designation":"TOI-238"}],"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."}