{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T05:57:02.108Z","years_from_j2000":26.674,"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-356-b","name":"Kepler-356 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2307.7488046088124,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":292.4210998,"dec_deg":37.6827919,"epoch_ra_deg":292.657741,"epoch_dec_deg":37.737984,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-356","semi_major_axis_km":8527078.6299,"periapsis_km":null,"mass_kg":1.845399871147536e+25,"mass_msun":0.00000928078,"constellation":"Cygnus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-356-b","radius_km":10013.617,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-356","host_v_mag":13.058,"eccentricity":0,"uncertainties":{"radius_km":[1849.649,1849.649],"distance_ly":[33.28425834599366,34.25620435158956],"host_mass_solar":[0.036,0.031],"host_radius_solar":[0.243,0.243],"host_temperature_k":[100,100],"orbital_period_days":[0.000021,0.000021]},"host_mass_solar":1.163,"inclination_deg":84.44,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.335,"planets_in_system":2,"discovery_facility":"Kepler","host_temperature_k":6133,"orbital_period_days":4.612696,"transit_midpoint_bjd":2454965.77463,"equilibrium_temperature_k":1294},"designations":[{"catalog":"Exoplanet","designation":"Kepler-356 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."}