{"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":"2026-09-08T19:39:52.064Z","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-d","name":"TOI-2141 d","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":259.058175,"epoch_dec_deg":18.309295,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-2141","semi_major_axis_km":43473141.22542,"periapsis_km":null,"mass_kg":8.898530123009155e+25,"mass_msun":0.000044752,"constellation":"Hercules","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/toi-2141-d","radius_km":25321.057000000004,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-2141","host_v_mag":9.46,"uncertainties":{"mass_kg":[1.2541552522361896e+25,1.2541552522361896e+25],"distance_ly":[0.7318949115963722,0.7361349445066899],"host_mass_solar":[0.051,0.059],"host_radius_solar":[0.007,0.007],"host_temperature_k":[61,61],"semi_major_axis_km":[852707.8629899999,822788.2888499999],"orbital_period_days":[0.25,0.24]},"host_mass_solar":0.896,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.95,"planets_in_system":3,"discovery_facility":"Roque de los Muchachos Observatory","host_temperature_k":5635,"orbital_period_days":60.45,"transit_midpoint_bjd":2458940.5,"equilibrium_temperature_k":491.4},"designations":[{"catalog":"Exoplanet","designation":"TOI-2141 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."}