{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T01:08:48.374Z","years_from_j2000":26.682,"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-29021-b","name":"HD 29021 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":101.08858155314974,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":69.4681379,"dec_deg":60.6762985,"epoch_ra_deg":70.06107,"epoch_dec_deg":60.730187,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 29021","semi_major_axis_km":343177515.3858,"periapsis_km":null,"mass_kg":8.484616960912542e+27,"mass_msun":0.00426704,"constellation":"Camelopardalis","discovered":"2017","featured":false,"url":"https://spacecatalog.org/object/hd-29021-b","radius_km":82277.49,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 29021","host_v_mag":7.76,"eccentricity":0.453,"uncertainties":{"mass_kg":[1.2337809898418685e+27,1.2717434818370028e+27],"distance_ly":[0.13731183501874897,0.13763799139646574],"eccentricity":[0.013,0.014],"host_mass_solar":[0.02,0.02],"inclination_deg":[4.9,6.8],"host_radius_solar":[0.09,0.09],"host_temperature_k":[45,45],"semi_major_axis_km":[2842359.5432999996,2842359.5432999996],"orbital_period_days":[7,7],"argument_of_periastron_deg":[3.2,3.4]},"host_mass_solar":0.86,"inclination_deg":33.7,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.85,"planets_in_system":1,"discovery_facility":"Haute-Provence Observatory","host_spectral_type":"G5","host_temperature_k":5560,"orbital_period_days":1365,"periastron_epoch_bjd":2455824.8,"equilibrium_temperature_k":163.2,"argument_of_periastron_deg":180.6},"designations":[{"catalog":"Exoplanet","designation":"HD 29021 b"},{"catalog":"Host star","designation":"HD 29021"}],"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."}