{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T03:37:21.356Z","years_from_j2000":26.685,"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-4377-b","name":"TOI-4377 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1486.6860009084598,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":164.9324709,"dec_deg":-82.2213501,"epoch_ra_deg":164.973292,"epoch_dec_deg":-82.365213,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-4377","semi_major_axis_km":8661716.713529998,"periapsis_km":null,"mass_kg":1.816505241973154e+27,"mass_msun":0.000913547,"constellation":"Chamaeleon","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/toi-4377-b","radius_km":96371.215711038,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-4377","host_v_mag":11.707,"eccentricity":0.045,"uncertainties":{"mass_kg":[1.6513684018480686e+26,1.6893308936043165e+26],"radius_km":[5790.852005064001,5790.852005064001],"distance_ly":[15.681598640621022,16.011016582114934],"eccentricity":[0.032,0.053],"host_mass_solar":[0.07,0.08],"inclination_deg":[1.4,1.7],"host_radius_solar":[0.14,0.15],"host_temperature_k":[57,57],"semi_major_axis_km":[164557.65777,149597.8707],"orbital_period_days":[0.000019,0.000019],"argument_of_periastron_deg":[0.98,2]},"host_mass_solar":1.36,"inclination_deg":80.3,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":3.52,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":4974,"orbital_period_days":4.378081,"transit_midpoint_bjd":2458602.1245,"equilibrium_temperature_k":1162.08,"argument_of_periastron_deg":-0.73},"designations":[{"catalog":"Exoplanet","designation":"TOI-4377 b"},{"catalog":"Host star","designation":"TOI-4377"}],"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."}