{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T02:33:19.758Z","years_from_j2000":26.682,"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-1518-b","name":"TOI-1518 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":736.7481184967974,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":352.2675207,"dec_deg":67.0348062,"epoch_ra_deg":352.559598,"epoch_dec_deg":67.182765,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-1518","semi_major_axis_km":5553072.960383999,"periapsis_km":null,"mass_kg":3.4735680175547985e+27,"mass_msun":0.00174691,"constellation":"Cepheus","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/toi-1518-b","radius_km":134261.975600075,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-1518","host_v_mag":8.952,"uncertainties":{"mass_kg":[8.921185618856587e+26,8.921185618856587e+26],"radius_km":[3002.663995539,3002.663995539],"distance_ly":[5.433765252760945,5.512042783412964],"host_mass_solar":[0.12,0.13],"inclination_deg":[0.097,0.097],"host_radius_solar":[0.043,0.043],"host_temperature_k":[100,98],"semi_major_axis_km":[122670.25397399999,122670.25397399999],"orbital_period_days":[4.3e-7,4.3e-7]},"host_mass_solar":1.88,"inclination_deg":77.626,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.942,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_spectral_type":"F0","host_temperature_k":7299,"orbital_period_days":1.90261131,"transit_midpoint_bjd":2459983.791942,"eccentricity_upper_limit":0.01,"equilibrium_temperature_k":2546},"designations":[{"catalog":"Exoplanet","designation":"TOI-1518 b"},{"catalog":"Host star","designation":"TOI-1518"}],"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."}