{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T12:45:12.206Z","years_from_j2000":26.669,"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-41-b","name":"Kepler-41 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":3565.1501335461785,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":294.5132465,"dec_deg":45.9816453,"epoch_ra_deg":294.715487,"epoch_dec_deg":46.041807,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-41","semi_major_axis_km":4639029.970407,"periapsis_km":null,"mass_kg":1.0629264371095096e+27,"mass_msun":0.000534561,"constellation":"Cygnus","discovered":"2011","featured":false,"url":"https://spacecatalog.org/object/kepler-41-b","radius_km":92227.32600000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-41","host_v_mag":14.509,"eccentricity":0,"uncertainties":{"mass_kg":[1.5187222887793477e+26,1.5187222887793477e+26],"radius_km":[1403.182,1403.182],"distance_ly":[88.06222198352073,88.06222198352073],"host_mass_solar":[0.04,0.04],"inclination_deg":[0.09,0.09],"host_radius_solar":[0.02,0.02],"host_temperature_k":[100,100],"semi_major_axis_km":[59839.14828,59839.14828],"orbital_period_days":[5.2e-7,5.2e-7]},"host_mass_solar":1.15,"inclination_deg":82.51,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.29,"planets_in_system":1,"discovery_facility":"Kepler","host_spectral_type":"G2 V","host_temperature_k":5750,"orbital_period_days":1.8555582,"transit_midpoint_bjd":2455187.280482,"equilibrium_temperature_k":1790},"designations":[{"catalog":"Exoplanet","designation":"Kepler-41 b"},{"catalog":"Host star","designation":"Kepler-41"}],"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":"2026-09-01T22:58:55.274Z","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."}