{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T10:07:45.236Z","years_from_j2000":26.669,"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-423-b","name":"Kepler-423 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2474.7213006171223,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":292.8557189,"dec_deg":46.3911883,"epoch_ra_deg":293.054153,"epoch_dec_deg":46.44736,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-423","semi_major_axis_km":5363083.6645949995,"periapsis_km":null,"mass_kg":1.1293429159672176e+27,"mass_msun":0.000567963,"constellation":"Cygnus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-423-b","radius_km":85217.79410000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-423","host_v_mag":14.462,"eccentricity":0.019,"uncertainties":{"mass_kg":[1.5374151742055346e+26,1.5374151742055346e+26],"radius_km":[3718.4323,3718.4323],"distance_ly":[41.61755379665646,41.61755379665646],"eccentricity":[0.014,0.028],"host_mass_solar":[0.04,0.04],"inclination_deg":[0.126,0.126],"host_radius_solar":[0.04,0.04],"host_temperature_k":[80,80],"semi_major_axis_km":[170541.57259799997,77790.89276399999],"orbital_period_days":[7e-8,7e-8],"argument_of_periastron_deg":[33.88,77.01]},"host_mass_solar":0.85,"inclination_deg":87.828,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.95,"planets_in_system":1,"discovery_facility":"Kepler","host_spectral_type":"G4 V","host_temperature_k":5560,"orbital_period_days":2.6843285,"transit_midpoint_bjd":2454966.35480997,"equilibrium_temperature_k":1605,"argument_of_periastron_deg":120.26},"designations":[{"catalog":"Exoplanet","designation":"Kepler-423 b"},{"catalog":"Host star","designation":"Kepler-423"}],"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":"2026-09-01T22:58:55.274Z","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."}