{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T21:30:37.629Z","years_from_j2000":26.679,"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-4732-c","name":"HD 4732 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":178.68183612471844,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":12.3085089,"dec_deg":-24.1369079,"epoch_ra_deg":12.639257,"epoch_dec_deg":-23.990399,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 4732","semi_major_axis_km":706849939.0574999,"periapsis_km":null,"mass_kg":6.387189278151504e+27,"mass_msun":0.00321221,"constellation":"Cetus","discovered":"2012","featured":false,"url":"https://spacecatalog.org/object/hd-4732-c","radius_km":83553.11,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 4732","host_v_mag":5.9,"eccentricity":0.187,"uncertainties":{"mass_kg":[5.1059551731664136e+26,2.2018245355983527e+26],"distance_ly":[0.5570750931401978,0.5570750931401978],"eccentricity":[0.066,0.034],"host_mass_solar":[0.17,0.15],"host_radius_solar":[0.13,0.12],"semi_major_axis_km":[8527078.6299,8527078.6299],"orbital_period_days":[57.6,58.12],"argument_of_periastron_deg":[13.2,16.6]},"host_mass_solar":1.39,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":5.03,"planets_in_system":2,"discovery_facility":"Multiple Observatories","host_spectral_type":"K0 IV","host_temperature_k":4898,"orbital_period_days":3184.2,"periastron_epoch_bjd":2459459.3,"equilibrium_temperature_k":243.69,"argument_of_periastron_deg":108.5},"designations":[{"catalog":"Exoplanet","designation":"HD 4732 c"},{"catalog":"Host star","designation":"HD 4732"}],"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."}