{"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":"2026-09-02T19:13:34.398Z","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-642-b","name":"Kepler-642 b","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":2549.1795400860774,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":293.8345542,"dec_deg":42.624948,"epoch_ra_deg":294.051852,"epoch_dec_deg":42.683507,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-642","semi_major_axis_km":8423856.099117,"periapsis_km":null,"mass_kg":5.2256468843174565e+25,"mass_msun":0.0000262805,"constellation":"Cygnus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/kepler-642-b","radius_km":18496.49,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-642","host_v_mag":13.335,"eccentricity":0,"uncertainties":{"radius_km":[3571.7360000000003,8291.53],"distance_ly":[27.433012929755286,28.023355973422596],"host_mass_solar":[0.157,0.229],"host_radius_solar":[0.321,0.743],"host_temperature_k":[201.09,133.26],"semi_major_axis_km":[68815.02052199999,68815.02052199999],"orbital_period_days":[0.000006603,0.000006603]},"host_mass_solar":1.4,"inclination_deg":89.58,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.66,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":6570,"orbital_period_days":4.41745855,"transit_midpoint_bjd":2455003.79162,"equilibrium_temperature_k":1810},"designations":[{"catalog":"Exoplanet","designation":"Kepler-642 b"},{"catalog":"Host star","designation":"Kepler-642"}],"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":"2026-09-02T18:38:07.546Z","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."}