{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T21:03:33.894Z","years_from_j2000":26.684,"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-3540-a-b","name":"TOI-3540 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":null,"distance_method":null,"ra_deg":328.9113712,"dec_deg":28.1794996,"epoch_ra_deg":329.213271,"epoch_dec_deg":28.306619,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-3540 A","semi_major_axis_km":6416252.674322999,"periapsis_km":null,"mass_kg":2.2397870277129304e+27,"mass_msun":0.00112642,"constellation":"Pegasus","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/toi-3540-a-b","radius_km":150133.19958560698,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-3540 A","host_v_mag":11.514,"eccentricity":0,"uncertainties":{"mass_kg":[2.657374439659409e+26,2.657374439659409e+26],"host_mass_solar":[0.069,0.071],"host_radius_solar":[0.033,0.033],"host_temperature_k":[79,79],"semi_major_axis_km":[139126.01975099999,137630.04104399998],"orbital_period_days":[0.0000079,0.0000079]},"host_mass_solar":1.081,"inclination_deg":81.93,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":1.228,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":5810,"orbital_period_days":3.119999,"transit_midpoint_bjd":2459109.14114,"equilibrium_temperature_k":1498},"designations":[{"catalog":"Exoplanet","designation":"TOI-3540 A b"},{"catalog":"Host star","designation":"TOI-3540 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."}