{"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":"2026-09-05T07:54:09.132Z","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-124330-b","name":"HD 124330 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":196.33863778879206,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":212.8207093,"dec_deg":54.4089731,"epoch_ra_deg":213.054193,"epoch_dec_deg":54.282233,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 124330","semi_major_axis_km":128654168.80199999,"periapsis_km":null,"mass_kg":1.4235934498175404e+27,"mass_msun":0.000715946,"constellation":"Boötes","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/hd-124330-b","radius_km":89293.40000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 124330","host_v_mag":7.88,"eccentricity":0.34,"uncertainties":{"mass_kg":[1.1388747598540324e+26,1.1388747598540324e+26],"distance_ly":[0.3333318180265118,0.334310287159662],"eccentricity":[0.05,0.05],"host_mass_solar":[0.079,0.079],"host_radius_solar":[0.047343,0.073099],"host_temperature_k":[19,19],"semi_major_axis_km":[5983914.828,5983914.828],"orbital_period_days":[1.21,1.21],"argument_of_periastron_deg":[10.44,10.44]},"host_mass_solar":1.15,"inclination_deg":0.8084,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.30446,"planets_in_system":1,"discovery_facility":"Haute-Provence Observatory","host_spectral_type":"G4 IV","host_temperature_k":5873,"orbital_period_days":270.66,"equilibrium_temperature_k":348.79,"argument_of_periastron_deg":18.28},"designations":[{"catalog":"Exoplanet","designation":"HD 124330 b"},{"catalog":"Host star","designation":"HD 124330"}],"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."}