{"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":"2026-09-07T03:07:08.176Z","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-203030-b","name":"HD 203030 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":128.01735672295496,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":319.7432238,"dec_deg":26.2305846,"epoch_ra_deg":320.038997,"epoch_dec_deg":26.3435,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 203030","semi_major_axis_km":72869122817.97,"periapsis_km":null,"mass_kg":2.0879370597323928e+28,"mass_msun":0.0105005,"constellation":"Vulpecula","discovered":"2006","featured":false,"url":"https://spacecatalog.org/object/hd-203030-b","radius_km":92224.67972631,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 203030","host_v_mag":8.45,"uncertainties":{"mass_kg":[5.694373799270162e+27,7.592498399026883e+27],"radius_km":[2859.6800048630002,4289.519975404],"distance_ly":[0.3078916205646058,0.3095224024531895],"host_mass_solar":[0.121731,0.129811],"host_radius_solar":[0.0256,0.019367],"host_temperature_k":[8,10],"semi_major_axis_km":[269276167.26,269276167.26]},"host_mass_solar":0.94,"stars_in_system":1,"discovery_method":"Imaging","host_radius_solar":0.856458,"planets_in_system":1,"discovery_facility":"Palomar Observatory","host_spectral_type":"G8 V","host_temperature_k":5603,"equilibrium_temperature_k":1040},"designations":[{"catalog":"Exoplanet","designation":"HD 203030 b"},{"catalog":"Host star","designation":"HD 203030"}],"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."}