{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T09:31:49.521Z","years_from_j2000":26.68,"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":"hd-63433-b","name":"HD 63433 b","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":73.07044408177062,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":117.4793699,"dec_deg":27.3631342,"epoch_ra_deg":117.892561,"epoch_dec_deg":27.295676,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 63433","semi_major_axis_km":10771046.690399999,"periapsis_km":null,"mass_kg":1.2992451196380145e+26,"mass_msun":0.0000653409,"constellation":"Gemini","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/hd-63433-b","radius_km":13649.134000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 63433","host_v_mag":6.92035,"eccentricity":0.24,"uncertainties":{"radius_km":[440.0889000000001,554.8947],"distance_ly":[0.07338518498626727,0.07338518498626727],"eccentricity":[0.18,0.27],"host_mass_solar":[0.022,0.022],"inclination_deg":[0.381,0.502],"host_radius_solar":[0.029,0.029],"host_temperature_k":[56,56],"semi_major_axis_km":[149597.8707,149597.8707],"orbital_period_days":[0.0000088,0.0000089]},"host_mass_solar":0.956,"inclination_deg":89.075,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.934,"planets_in_system":3,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"G5 V","host_temperature_k":5553,"orbital_period_days":7.1079475,"transit_midpoint_bjd":2458845.372818,"equilibrium_temperature_k":967.11,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"HD 63433 b"}],"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."}