{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T13:13:59.590Z","years_from_j2000":26.678,"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-1453-c","name":"TOI-1453 c","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":256.82042415982954,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":258.2232705,"dec_deg":57.1977779,"epoch_ra_deg":258.341109,"epoch_dec_deg":57.165168,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-1453","semi_major_axis_km":null,"periapsis_km":null,"mass_kg":1.761789520998457e+25,"mass_msun":0.00000886029,"constellation":"Draco","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/toi-1453-c","radius_km":14184.894400000003,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-1453","host_v_mag":11.113,"eccentricity":0,"uncertainties":{"mass_kg":[5.016621008944759e+24,4.956899330266845e+24],"radius_km":[605.9195000000001,605.9195000000001],"distance_ly":[0.38877840223835813,0.3897568713715084],"host_mass_solar":[0.035,0.035],"inclination_deg":[0.11,0.1],"host_radius_solar":[0.029,0.029],"host_temperature_k":[68,68],"orbital_period_days":[0.0000041,0.0000041]},"host_mass_solar":0.715,"inclination_deg":87.61,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.72,"planets_in_system":2,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":4975,"orbital_period_days":6.5886982,"transit_midpoint_bjd":2459395.38133,"equilibrium_temperature_k":819.8,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"TOI-1453 c"}],"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."}