{"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":"2026-09-02T19:58:58.763Z","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-23-b","name":"Kepler-23 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2725.871496150346,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":294.2189131,"dec_deg":49.4792536,"epoch_ra_deg":294.402278,"epoch_dec_deg":49.538693,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-23","semi_major_axis_km":10788998.434884,"periapsis_km":null,"mass_kg":1.528874974154593e+25,"mass_msun":0.00000768893,"constellation":"Cygnus","discovered":"2011","featured":false,"url":"https://spacecatalog.org/object/kepler-23-b","radius_km":10447.3278,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-23","host_v_mag":13.567,"eccentricity":0.017,"uncertainties":{"mass_kg":[2.3888671471165517e+24,2.568032183150293e+24],"radius_km":[299.77070000000003,299.77070000000003],"distance_ly":[36.40883644452007,37.3873055776703],"eccentricity":[0.014,0.019],"host_mass_solar":[0.077,0.077],"host_radius_solar":[0.048,0.048],"host_temperature_k":[100,100],"semi_major_axis_km":[85270.78629899998,85270.78629899998]},"host_mass_solar":1.078,"inclination_deg":89.57,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.548,"planets_in_system":3,"discovery_facility":"Kepler","host_temperature_k":5828,"orbital_period_days":7.1,"transit_midpoint_bjd":2454971.32271,"equilibrium_temperature_k":1157},"designations":[{"catalog":"Exoplanet","designation":"Kepler-23 b"},{"catalog":"Host star","designation":"Kepler-23"}],"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."}