{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-03T01:52:50.126Z","years_from_j2000":26.671,"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-447-b","name":"Kepler-447 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":874.2328163957362,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":285.2685283,"dec_deg":48.5598835,"epoch_ra_deg":285.448494,"epoch_dec_deg":48.597258,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-447","semi_major_axis_km":11504076.25683,"periapsis_km":null,"mass_kg":2.6003416113150444e+27,"mass_msun":0.00130775,"constellation":"Draco","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/kepler-447-b","radius_km":117931.069,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-447","host_v_mag":12.52,"eccentricity":0.123,"uncertainties":{"mass_kg":[8.731309422710995e+26,9.110542082315749e+26],"radius_km":[40054.468,42159.241],"distance_ly":[5.945830765776233,6.027369860205418],"eccentricity":[0.036,0.037],"host_mass_solar":[0.21,0.21],"inclination_deg":[0.32,0.24],"host_radius_solar":[0.19,0.19],"host_temperature_k":[62,62],"semi_major_axis_km":[1181823.17853,927506.7983399999],"orbital_period_days":[0.00000182,0.00000182],"argument_of_periastron_deg":[11,1.1]},"host_mass_solar":1,"inclination_deg":86.55,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.05,"planets_in_system":1,"discovery_facility":"Kepler","host_spectral_type":"G8 V","host_temperature_k":5493,"orbital_period_days":7.79430132,"transit_midpoint_bjd":2454970.259778,"equilibrium_temperature_k":882,"argument_of_periastron_deg":98.3},"designations":[{"catalog":"Exoplanet","designation":"Kepler-447 b"},{"catalog":"Host star","designation":"Kepler-447"}],"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."}