{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T17:20:11.629Z","years_from_j2000":26.673,"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-56-b","name":"Kepler-56 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2977.7881591712044,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":293.7583002,"dec_deg":41.871807,"epoch_ra_deg":293.978861,"epoch_dec_deg":41.930201,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-56","semi_major_axis_km":15378661.107959999,"periapsis_km":null,"mass_kg":1.319849098781895e+26,"mass_msun":0.0000663771,"constellation":"Cygnus","discovered":"2012","featured":false,"url":"https://spacecatalog.org/object/kepler-56-b","radius_km":41521.431000000004,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-56","host_v_mag":12.598,"eccentricity":0.04,"uncertainties":{"mass_kg":[2.1499804324048965e+25,2.3291454684386377e+25],"radius_km":[1785.8680000000002,1849.649],"distance_ly":[76.798411479073,76.798411479073],"eccentricity":[0.01,0.01],"host_mass_solar":[0.13,0.13],"host_radius_solar":[0.15,0.15],"host_temperature_k":[97,97],"semi_major_axis_km":[553512.12159,553512.12159],"orbital_period_days":[0.001,0.0011],"argument_of_periastron_deg":[17,17]},"host_mass_solar":1.32,"inclination_deg":89.66,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":4.23,"planets_in_system":3,"discovery_facility":"Kepler","host_temperature_k":4840,"orbital_period_days":10.5016,"transit_midpoint_bjd":2454978.2556,"equilibrium_temperature_k":1378,"argument_of_periastron_deg":-11},"designations":[{"catalog":"Exoplanet","designation":"Kepler-56 b"}],"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."}