{"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":"2026-09-07T01:04:47.049Z","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-38283-b","name":"HD 38283 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":124.1400097046583,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":84.2605324,"dec_deg":-73.6998131,"epoch_ra_deg":84.097002,"epoch_dec_deg":-73.682358,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 38283","semi_major_axis_km":152589828.114,"periapsis_km":null,"mass_kg":7.592536453680537e+26,"mass_msun":0.00038184,"constellation":"Mensa","discovered":"2010","featured":false,"url":"https://spacecatalog.org/object/hd-38283-b","radius_km":89293.40000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 38283","host_v_mag":6.69,"eccentricity":0.41,"uncertainties":{"mass_kg":[7.592536453680536e+25,7.592536453680536e+25],"distance_ly":[0.11904707786661134,0.1193732342443281],"eccentricity":[0.16,0.16],"host_mass_solar":[0.07,0.07],"host_radius_solar":[0.01,0.01],"host_temperature_k":[12,12],"semi_major_axis_km":[2991957.414,2991957.414],"orbital_period_days":[1.6,1.6]},"host_mass_solar":1.37,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.49,"planets_in_system":1,"discovery_facility":"Anglo-Australian Telescope","host_spectral_type":"F9.5 V","host_temperature_k":5981,"orbital_period_days":363.20001,"periastron_epoch_bjd":2450802.6,"equilibrium_temperature_k":348.58},"designations":[{"catalog":"Exoplanet","designation":"HD 38283 b"},{"catalog":"Host star","designation":"HD 38283"}],"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."}