{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T15:28:30.280Z","years_from_j2000":26.678,"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-1256-b","name":"Kepler-1256 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2906.6795457014,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":291.4742443,"dec_deg":44.6834119,"epoch_ra_deg":291.679914,"epoch_dec_deg":44.736277,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-1256","semi_major_axis_km":16056339.462230997,"periapsis_km":null,"mass_kg":1.6901235065849604e+25,"mass_msun":0.00000849987,"constellation":"Cygnus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/kepler-1256-b","radius_km":9503.369,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-1256","host_v_mag":13.685,"eccentricity":0,"uncertainties":{"radius_km":[1403.182,2806.364],"distance_ly":[42.88467132408601,42.88467132408601],"host_mass_solar":[0.055,0.09],"host_radius_solar":[0.193,0.266],"host_temperature_k":[69.29,67.94],"semi_major_axis_km":[173533.53001199997,173533.53001199997],"orbital_period_days":[0.000108,0.000108]},"host_mass_solar":1.17,"inclination_deg":87.43,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.36,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":6129,"orbital_period_days":12.4127754,"transit_midpoint_bjd":2454973.36032,"equilibrium_temperature_k":933},"designations":[{"catalog":"Exoplanet","designation":"Kepler-1256 b"},{"catalog":"Host star","designation":"Kepler-1256"}],"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."}