{"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":"2026-09-08T21:23:13.747Z","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-2578-b","name":"TOI-2578 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":931.2743052946174,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":68.0521023,"dec_deg":52.2526547,"epoch_ra_deg":68.575042,"epoch_dec_deg":52.310091,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-2578","semi_major_axis_km":7405094.59965,"periapsis_km":null,"mass_kg":9.984135394600908e+26,"mass_msun":0.000502117,"constellation":"Perseus","discovered":"2026","featured":false,"url":"https://spacecatalog.org/object/toi-2578-b","radius_km":125396.96766791501,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-2578","host_v_mag":11.353,"eccentricity":0.098,"uncertainties":{"mass_kg":[1.2907247280734568e+26,1.3476684660064368e+26],"radius_km":[4075.04398939,4146.535984728001],"distance_ly":[11.203471574570136,11.470919804297866],"eccentricity":[0.042,0.043],"host_mass_solar":[0.09,0.09],"inclination_deg":[0.65,0.56],"host_radius_solar":[0.02,0.02],"host_temperature_k":[244,244],"semi_major_axis_km":[314155.52846999996,329115.31554],"orbital_period_days":[0.0000033,0.0000033],"argument_of_periastron_deg":[37,40]},"host_mass_solar":1.27,"inclination_deg":81.32,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.64,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":6333,"orbital_period_days":3.4579667,"transit_midpoint_bjd":2459911.4803,"equilibrium_temperature_k":1778,"argument_of_periastron_deg":83},"designations":[{"catalog":"Exoplanet","designation":"TOI-2578 b"},{"catalog":"Host star","designation":"TOI-2578"}],"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."}