{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-09T01:57:50.881Z","years_from_j2000":26.687,"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-2141-b","name":"TOI-2141 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":253.36479733792063,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":258.7623456,"dec_deg":18.3403449,"epoch_ra_deg":259.058182,"epoch_dec_deg":18.309291,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-2141","semi_major_axis_km":19776838.50654,"periapsis_km":null,"mass_kg":1.2004057414260673e+26,"mass_msun":0.0000603701,"constellation":"Hercules","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/toi-2141-b","radius_km":20071.8807,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-2141","host_v_mag":9.46,"uncertainties":{"mass_kg":[8.958251801687069e+24,9.555468588466207e+24],"radius_km":[267.88020000000006,274.2583],"distance_ly":[0.7318949115963722,0.7361349445066899],"host_mass_solar":[0.051,0.059],"inclination_deg":[0.063,0.063],"host_radius_solar":[0.007,0.007],"host_temperature_k":[61,61],"semi_major_axis_km":[448793.61209999997,448793.61209999997],"orbital_period_days":[0.00002,0.000019]},"host_mass_solar":0.896,"inclination_deg":88.755,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.95,"planets_in_system":3,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":5635,"orbital_period_days":18.261608,"transit_midpoint_bjd":2458992.502,"eccentricity_upper_limit":0.21,"equilibrium_temperature_k":728,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"TOI-2141 b"},{"catalog":"Host star","designation":"TOI-2141"}],"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."}