{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T16:49:41.755Z","years_from_j2000":26.686,"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":"bd-45-564-b","name":"BD+45 564 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":174.89157285927215,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":32.9470485,"dec_deg":45.9242187,"epoch_ra_deg":33.374042,"epoch_dec_deg":46.050722,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"BD+45 564","semi_major_axis_km":124166232.68099998,"periapsis_km":null,"mass_kg":2.58144945566914e+27,"mass_msun":0.00129825,"constellation":"Andromeda","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/bd-45-564-b","radius_km":86742.16,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"BD+45 564","host_v_mag":9.67,"eccentricity":0.12,"uncertainties":{"mass_kg":[2.2777495197080647e+26,2.2777495197080647e+26],"distance_ly":[0.6213278995503962,0.6258940888384306],"eccentricity":[0.06,0.06],"host_mass_solar":[0.072,0.072],"host_radius_solar":[0.044083,0.041485],"host_temperature_k":[50,50],"semi_major_axis_km":[5983914.828,5983914.828],"orbital_period_days":[1.47,1.47],"argument_of_periastron_deg":[51.85,51.85]},"host_mass_solar":0.81,"inclination_deg":2.579,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.813064,"planets_in_system":1,"discovery_facility":"Haute-Provence Observatory","host_spectral_type":"K1","host_temperature_k":5004,"orbital_period_days":307.88,"equilibrium_temperature_k":238.82,"argument_of_periastron_deg":70.31},"designations":[{"catalog":"Exoplanet","designation":"BD+45 564 b"},{"catalog":"Host star","designation":"BD+45 564"}],"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."}