{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T13:14:05.810Z","years_from_j2000":26.678,"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-5817-b","name":"TOI-5817 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":263.3849735741344,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":322.3777987,"dec_deg":21.474527,"epoch_ra_deg":322.685344,"epoch_dec_deg":21.59182,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-5817","semi_major_axis_km":18295819.58661,"periapsis_km":null,"mass_kg":6.151332903825121e+25,"mass_msun":0.0000309359,"constellation":"Pegasus","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/toi-5817-b","radius_km":19644.548000000003,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-5817","host_v_mag":8.64,"uncertainties":{"mass_kg":[7.763818228128793e+24,8.361035014907931e+24],"radius_km":[892.9340000000001,892.9340000000001],"distance_ly":[1.264834432785531,1.2765760623833338],"host_mass_solar":[0.055,0.072],"inclination_deg":[0.34,0.43],"host_radius_solar":[0.04,0.043],"host_temperature_k":[50,50],"semi_major_axis_km":[897587.2241999999,897587.2241999999],"orbital_period_days":[0.0001,0.00012]},"host_mass_solar":0.97,"inclination_deg":88.72,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":1.427,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"G2 IV-V","host_temperature_k":5770,"orbital_period_days":15.61031,"transit_midpoint_bjd":2459799.3065,"eccentricity_upper_limit":0.2,"equilibrium_temperature_k":950},"designations":[{"catalog":"Exoplanet","designation":"TOI-5817 b"},{"catalog":"Host star","designation":"TOI-5817"}],"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."}