{"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":"2026-09-07T23:25:09.831Z","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-c","name":"HD 50499 c","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":103.253992,"epoch_dec_deg":-33.947004,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 50499","semi_major_axis_km":1349372793.7139997,"periapsis_km":null,"mass_kg":5.561532952320992e+27,"mass_msun":0.00279698,"constellation":"Puppis","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/hd-50499-c","radius_km":84190.92,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 50499","host_v_mag":7.21,"eccentricity":0,"uncertainties":{"mass_kg":[3.416641404156241e+26,1.385637902796698e+27],"distance_ly":[0.1810167896327926,0.1816691023882261],"eccentricity":[0.02,0.14],"host_mass_solar":[0.07,0.07],"host_radius_solar":[0.02,0.02],"host_temperature_k":[43,43],"semi_major_axis_km":[49367297.331,258804316.311],"orbital_period_days":[405.4275,2622.495],"argument_of_periastron_deg":[138,138]},"host_mass_solar":1.31,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.42,"planets_in_system":2,"discovery_facility":"La Silla Observatory","host_spectral_type":"G1 V","host_temperature_k":6099,"orbital_period_days":8619.9,"periastron_epoch_bjd":2461832,"transit_midpoint_bjd":2452710,"equilibrium_temperature_k":116.69,"argument_of_periastron_deg":23},"designations":[{"catalog":"Exoplanet","designation":"HD 50499 c"},{"catalog":"Host star","designation":"HD 50499"}],"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."}