{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T19:13:35.493Z","years_from_j2000":26.684,"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-50499-b","name":"HD 50499 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":150.9598486443061,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":103.008075,"dec_deg":-33.915267,"epoch_ra_deg":103.253987,"epoch_dec_deg":-33.947005,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 50499","semi_major_axis_km":573408638.3931,"periapsis_km":null,"mass_kg":3.105347409555339e+27,"mass_msun":0.00156172,"constellation":"Puppis","discovered":"2005","featured":false,"url":"https://spacecatalog.org/object/hd-50499-b","radius_km":86104.35,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 50499","host_v_mag":7.21,"eccentricity":0.266,"uncertainties":{"mass_kg":[3.226827992814228e+25,3.226827992814228e+25],"distance_ly":[0.1810167896327926,0.1816691023882261],"eccentricity":[0.044,0.044],"host_mass_solar":[0.02,0.02],"host_radius_solar":[0.054,0.054],"host_temperature_k":[54,54],"semi_major_axis_km":[4487936.120999999,4562735.056349999],"orbital_period_days":[21.72,21.92],"argument_of_periastron_deg":[10.094,9.579]},"host_mass_solar":1.253,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.351,"planets_in_system":2,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"G1 V","host_temperature_k":6102,"orbital_period_days":2447.1,"periastron_epoch_bjd":2456291.1,"transit_midpoint_bjd":2455005,"equilibrium_temperature_k":174.69,"argument_of_periastron_deg":288.31},"designations":[{"catalog":"Exoplanet","designation":"HD 50499 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."}