{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-01T19:39:19.382Z","years_from_j2000":26.668,"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-45-b","name":"Kepler-45 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1245.7510231253243,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":292.8729292,"dec_deg":41.0641727,"epoch_ra_deg":293.09613,"epoch_dec_deg":41.120407,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-45","semi_major_axis_km":4487936.120999999,"periapsis_km":null,"mass_kg":9.58515026276913e+26,"mass_msun":0.000482051,"constellation":"Cygnus","discovered":"2011","featured":false,"url":"https://spacecatalog.org/object/kepler-45-b","radius_km":68628.356,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-45","host_v_mag":16.744,"eccentricity":0.11,"uncertainties":{"mass_kg":[1.7082788969030462e+26,1.7082788969030462e+26],"radius_km":[7845.063,7845.063],"distance_ly":[20.81693080777115,20.81693080777115],"eccentricity":[0.09,0.1],"host_mass_solar":[0.06,0.06],"inclination_deg":[0.7,0.7],"host_radius_solar":[0.11,0.11],"host_temperature_k":[90,90],"orbital_period_days":[0.000004,0.000004],"argument_of_periastron_deg":[68,68]},"host_mass_solar":0.59,"inclination_deg":87,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.55,"planets_in_system":1,"discovery_facility":"Kepler","host_spectral_type":"M","host_temperature_k":3820,"orbital_period_days":2.455239,"transit_midpoint_bjd":2455003.82176,"equilibrium_temperature_k":1000,"argument_of_periastron_deg":230},"designations":[{"catalog":"Exoplanet","designation":"Kepler-45 b"},{"catalog":"Host star","designation":"Kepler-45"}],"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":"2026-08-30T09:56:50.739Z","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."}