{"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":"2026-09-02T08:47:53.221Z","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":"hd-47366-b","name":"HD 47366 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":275.1298647357143,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":99.4200181,"dec_deg":-12.9856593,"epoch_ra_deg":99.729917,"epoch_dec_deg":-13.008247,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 47366","semi_major_axis_km":180564629.9349,"periapsis_km":null,"mass_kg":3.9518954166696035e+27,"mass_msun":0.00198747,"constellation":"Canis Major","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/hd-47366-b","radius_km":85466.54000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 47366","host_v_mag":6.11151,"eccentricity":0.071,"uncertainties":{"mass_kg":[2.144880797665373e+26,1.8791433535799885e+26],"distance_ly":[1.48727308238835,1.48727308238835],"eccentricity":[0.046,0.03],"host_mass_solar":[0.13,0.13],"host_radius_solar":[0.33,0.33],"host_temperature_k":[100,100],"semi_major_axis_km":[299195.7414,149597.8707],"orbital_period_days":[0.72,0.27],"argument_of_periastron_deg":[8.19,299.7]},"host_mass_solar":1.81,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":7.3,"planets_in_system":2,"discovery_facility":"Okayama Astrophysical Observatory","host_spectral_type":"K1 III","host_temperature_k":4866,"orbital_period_days":360.08,"periastron_epoch_bjd":2455308.7,"equilibrium_temperature_k":577.05,"argument_of_periastron_deg":-152.1},"designations":[{"catalog":"Exoplanet","designation":"HD 47366 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":"2026-09-01T22:58:55.274Z","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."}