{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T06:19:37.990Z","years_from_j2000":26.677,"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-13724-c","name":"HD 13724 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":141.76386957458254,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":33.0859626,"dec_deg":-46.8166738,"epoch_ra_deg":33.345053,"epoch_dec_deg":-46.690322,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 13724","semi_major_axis_km":79885262.9538,"periapsis_km":null,"mass_kg":3.036999359610753e+26,"mass_msun":0.000152735,"constellation":"Phoenix","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/hd-13724-c","radius_km":52172.858,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 13724","host_v_mag":7.89,"eccentricity":0.651,"uncertainties":{"mass_kg":[3.986061661280763e+25,4.745311502377886e+25],"distance_ly":[0.17188441105672378,0.17221056743444052],"eccentricity":[0.092,0.078],"host_mass_solar":[0.055,0.055],"host_radius_solar":[0.048248,0.064315],"host_temperature_k":[81.31,205.39],"semi_major_axis_km":[1495978.707,1495978.707],"orbital_period_days":[0.17514,0.58279],"argument_of_periastron_deg":[10.069,7.409]},"host_mass_solar":1.004,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.04198,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_temperature_k":5835.31,"orbital_period_days":142.22895,"periastron_epoch_bjd":2451333.852,"equilibrium_temperature_k":393.06,"argument_of_periastron_deg":219.768},"designations":[{"catalog":"Exoplanet","designation":"HD 13724 c"},{"catalog":"Host star","designation":"HD 13724"}],"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."}