{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T01:08:26.661Z","years_from_j2000":26.685,"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-120084-b","name":"HD 120084 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":336.0845778544411,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":205.661989,"dec_deg":78.0646376,"epoch_ra_deg":205.71109,"epoch_dec_deg":77.92883,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 120084","semi_major_axis_km":629807035.647,"periapsis_km":null,"mass_kg":1.2147997438443013e+28,"mass_msun":0.0061094,"constellation":"Ursa Minor","discovered":"2013","featured":false,"url":"https://spacecatalog.org/object/hd-120084-b","radius_km":81001.87,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 120084","host_v_mag":5.90686,"eccentricity":0.483,"uncertainties":{"mass_kg":[3.606436739537769e+27,5.504561339294489e+27],"distance_ly":[1.687859254684147,1.687859254684147],"eccentricity":[0.029,0.027],"host_mass_solar":[0.27,0.28],"inclination_deg":[12,22],"host_radius_solar":[0.8,0.82],"semi_major_axis_km":[28423595.433,25431638.019],"orbital_period_days":[9,9],"argument_of_periastron_deg":[5.2,5.1]},"host_mass_solar":2.16,"inclination_deg":38,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":10.37,"planets_in_system":1,"discovery_facility":"Okayama Astrophysical Observatory","host_spectral_type":"G7 III","host_temperature_k":4879,"orbital_period_days":2142,"periastron_epoch_bjd":2457083,"equilibrium_temperature_k":369.24,"argument_of_periastron_deg":103.9},"designations":[{"catalog":"Exoplanet","designation":"HD 120084 b"},{"catalog":"Host star","designation":"HD 120084"}],"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."}