{"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":"2026-09-07T06:37:37.530Z","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-4487-a-b","name":"TOI-4487 A b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1562.7619760108903,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":306.4220814,"dec_deg":45.9710306,"epoch_ra_deg":306.640386,"epoch_dec_deg":46.05822,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-4487 A","semi_major_axis_km":8150091.995735999,"periapsis_km":null,"mass_kg":2.372655749695901e+27,"mass_msun":0.00119324,"constellation":"Cygnus","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/toi-4487-a-b","radius_km":93154.075729485,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-4487 A","host_v_mag":12.109,"uncertainties":{"mass_kg":[3.036999359610753e+26,3.036999359610753e+26],"radius_km":[4575.487956756,4932.947997227],"distance_ly":[19.735722415640144,20.23800323732393],"host_mass_solar":[0.064,0.065],"inclination_deg":[0.63,0.76],"host_radius_solar":[0.046,0.046],"host_temperature_k":[88,90],"semi_major_axis_km":[128654.16880199999,127158.19009499998],"orbital_period_days":[0.0000021,0.0000021]},"host_mass_solar":1.378,"inclination_deg":86.85,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":1.634,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":6206,"orbital_period_days":3.9540709,"transit_midpoint_bjd":2460079.02001,"eccentricity_upper_limit":0.083,"equilibrium_temperature_k":1639},"designations":[{"catalog":"Exoplanet","designation":"TOI-4487 A b"},{"catalog":"Host star","designation":"TOI-4487 A"}],"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."}