{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T05:25:31.932Z","years_from_j2000":26.666,"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-40-b","name":"Kepler-40 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":7517.937122008708,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":296.8136883,"dec_deg":47.5265446,"epoch_ra_deg":297.010775,"epoch_dec_deg":47.592127,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-40","semi_major_axis_km":11967829.656,"periapsis_km":null,"mass_kg":4.1757397731597326e+27,"mass_msun":0.00210004,"constellation":"Cygnus","discovered":"2010","featured":false,"url":"https://spacecatalog.org/object/kepler-40-b","radius_km":83616.891,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-40","host_v_mag":14.657,"eccentricity":0,"uncertainties":{"mass_kg":[7.590625359962842e+26,7.590625359962842e+26],"radius_km":[2870.1450000000004,2870.1450000000004],"distance_ly":[385.32114463456065,428.3737864931708],"host_mass_solar":[0.06,0.06],"inclination_deg":[0.1,0.3],"host_radius_solar":[0.06,0.06],"host_temperature_k":[100,100],"semi_major_axis_km":[448793.61209999997,448793.61209999997],"orbital_period_days":[0.00064,0.00064]},"host_mass_solar":1.48,"inclination_deg":89.7,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":2.13,"planets_in_system":1,"discovery_facility":"Kepler","host_spectral_type":"F5 IV","host_temperature_k":6510,"orbital_period_days":6.87349,"transit_midpoint_bjd":2455005.5198,"equilibrium_temperature_k":1620},"designations":[{"catalog":"Exoplanet","designation":"Kepler-40 b"},{"catalog":"Host star","designation":"Kepler-40"}],"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":"2026-08-30T09:56:50.739Z","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."}