{"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":"2026-09-08T03:48:37.522Z","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-4515-b","name":"TOI-4515 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":631.1093293181214,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":21.1861778,"dec_deg":21.5130638,"epoch_ra_deg":21.551172,"epoch_dec_deg":21.653213,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-4515","semi_major_axis_km":17652548.742599998,"periapsis_km":null,"mass_kg":3.8042709317831084e+27,"mass_msun":0.00191322,"constellation":"Pisces","discovered":"2024","featured":false,"url":"https://spacecatalog.org/object/toi-4515-b","radius_km":77621.477,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-4515","host_v_mag":11.938,"eccentricity":0.461,"uncertainties":{"mass_kg":[1.0152685375245344e+26,1.0152685375245344e+26],"radius_km":[2742.583,2742.583],"distance_ly":[5.534873729853136,5.629459079390991],"eccentricity":[0.007,0.007],"host_mass_solar":[0.02,0.02],"inclination_deg":[0.041,0.039],"host_radius_solar":[0.03,0.03],"host_temperature_k":[70,70],"semi_major_axis_km":[149597.8707,149597.8707],"orbital_period_days":[0.000013,0.000013],"argument_of_periastron_deg":[2.2,2.1]},"host_mass_solar":0.949,"inclination_deg":87.954,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.86,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"G8/G9","host_temperature_k":5433,"orbital_period_days":15.266446,"transit_midpoint_bjd":2459451.62191,"equilibrium_temperature_k":705,"argument_of_periastron_deg":169.9},"designations":[{"catalog":"Exoplanet","designation":"TOI-4515 b"},{"catalog":"Host star","designation":"TOI-4515"}],"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."}