{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T20:02:52.542Z","years_from_j2000":26.67,"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":"kepler-453-b","name":"Kepler-453 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1444.3704724634895,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":283.2413322,"dec_deg":46.3784691,"epoch_ra_deg":283.432092,"epoch_dec_deg":46.41071,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-453","semi_major_axis_km":118227197.21420999,"periapsis_km":null,"mass_kg":9.555468588466207e+25,"mass_msun":0.0000480558,"constellation":"Lyra","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/kepler-453-b","radius_km":39569.7324,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-453","host_v_mag":13.672,"eccentricity":0.0359,"uncertainties":{"radius_km":[248.7459,248.7459],"distance_ly":[8.886130510892674,8.886130510892674],"eccentricity":[0.0088,0.0088],"host_mass_solar":[0.01,0.01],"inclination_deg":[0.0091,0.0091],"host_radius_solar":[0.011,0.011],"host_temperature_k":[100,100],"semi_major_axis_km":[418874.03796,418874.03796],"orbital_period_days":[0.053,0.053],"argument_of_periastron_deg":[3.7,3.7]},"host_mass_solar":0.944,"inclination_deg":89.4429,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.833,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":5527,"orbital_period_days":240.503,"equilibrium_temperature_k":273.62,"argument_of_periastron_deg":185.1},"designations":[{"catalog":"Exoplanet","designation":"Kepler-453 b"},{"catalog":"Host star","designation":"Kepler-453"}],"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."}