{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T07:54:03.175Z","years_from_j2000":26.677,"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-559-b","name":"TOI-559 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":760.8119360447387,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":46.8186159,"dec_deg":-31.1629951,"epoch_ra_deg":47.097747,"epoch_dec_deg":-31.059263,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-559","semi_major_axis_km":10815926.05161,"periapsis_km":null,"mass_kg":1.140772884453789e+28,"mass_msun":0.00573711,"constellation":"Fornax","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/toi-559-b","radius_km":77997.771761114,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-559","host_v_mag":11.091,"eccentricity":0.151,"uncertainties":{"mass_kg":[4.365686579440458e+26,4.5554990394161295e+26],"radius_km":[1787.300011012,2001.7759970260004],"distance_ly":[4.960838505071667,5.029331344392183],"eccentricity":[0.011,0.012],"host_mass_solar":[0.057,0.057],"inclination_deg":[0.38,0.52],"host_radius_solar":[0.026,0.028],"host_temperature_k":[76,85],"semi_major_axis_km":[194477.23190999997,194477.23190999997],"orbital_period_days":[0.0000051,0.0000051],"argument_of_periastron_deg":[2.6,3]},"host_mass_solar":1.026,"inclination_deg":89.08,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.233,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"G V","host_temperature_k":5925,"orbital_period_days":6.9839095,"transit_midpoint_bjd":2458893.81305,"equilibrium_temperature_k":1180,"argument_of_periastron_deg":-62.3},"designations":[{"catalog":"Exoplanet","designation":"TOI-559 b"},{"catalog":"Host star","designation":"TOI-559"}],"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."}