{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T01:01:25.526Z","years_from_j2000":26.685,"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-47536-b","name":"HD 47536 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":399.65897899898874,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":99.448958,"dec_deg":-32.3394531,"epoch_ra_deg":99.699561,"epoch_dec_deg":-32.362058,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 47536","semi_major_axis_km":288723890.451,"periapsis_km":null,"mass_kg":1.3915151131953914e+28,"mass_msun":0.00699813,"constellation":"Canis Major","discovered":"2002","featured":false,"url":"https://spacecatalog.org/object/hd-47536-b","radius_km":80364.06,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 47536","host_v_mag":5.25,"eccentricity":0.2,"uncertainties":{"mass_kg":[4.4791259008435346e+27,4.4791259008435346e+27],"distance_ly":[4.251448383537751,4.251448383537751],"eccentricity":[0.08,0.08],"host_mass_solar":[0.95,0.95],"host_radius_solar":[1.97,1.97],"semi_major_axis_km":[47871318.624,47871318.624],"orbital_period_days":[0.31,0.31],"argument_of_periastron_deg":[23.7,23.7]},"host_mass_solar":2.1,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":23.47,"planets_in_system":1,"discovery_facility":"La Silla Observatory","host_spectral_type":"K1 III","host_temperature_k":4380,"orbital_period_days":712.13,"periastron_epoch_bjd":2451599.36,"equilibrium_temperature_k":736.52,"argument_of_periastron_deg":260.8},"designations":[{"catalog":"Exoplanet","designation":"HD 47536 b"},{"catalog":"Host star","designation":"HD 47536"}],"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."}