{"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":"2026-09-07T17:29:41.356Z","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-938-b","name":"TOI-938 b","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":701.347105259422,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":63.0323442,"dec_deg":-12.1188357,"epoch_ra_deg":63.34825,"epoch_dec_deg":-12.049313,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-938","semi_major_axis_km":null,"periapsis_km":null,"mass_kg":1.2422109165006069e+26,"mass_msun":0.0000624726,"constellation":"Eridanus","discovered":"2026","featured":false,"url":"https://spacecatalog.org/object/toi-938-b","radius_km":30768.054344827,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-938","host_v_mag":11.389,"uncertainties":{"radius_km":[2100.9274521670004,2234.562551425],"distance_ly":[6.170878666400785,6.281771834824478],"host_mass_solar":[0.128469,0.164542],"inclination_deg":[1.42379,0.82124],"orbital_period_days":[0.00003719726,0.00003575793]},"host_mass_solar":1.1,"inclination_deg":88.78333,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.985134,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":5829.42,"orbital_period_days":8.80733882211,"transit_midpoint_bjd":2458445.17796099,"equilibrium_temperature_k":1073},"designations":[{"catalog":"Exoplanet","designation":"TOI-938 b"},{"catalog":"Host star","designation":"TOI-938"}],"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."}