{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-06T02:36:43.314Z","years_from_j2000":26.679,"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-5583-b","name":"HD 5583 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":714.9869649755362,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":14.486946,"dec_deg":34.9853306,"epoch_ra_deg":14.856156,"epoch_dec_deg":35.130583,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 5583","semi_major_axis_km":79286871.471,"periapsis_km":null,"mass_kg":1.0971215175568375e+28,"mass_msun":0.00551758,"constellation":"Andromeda","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/hd-5583-b","radius_km":81639.68000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 5583","host_v_mag":7.604,"eccentricity":0.076,"uncertainties":{"mass_kg":[1.0060110801126711e+27,1.0060110801126711e+27],"distance_ly":[11.017562439271593,11.360026635874174],"eccentricity":[0.023,0.07],"host_mass_solar":[0.1,0.1],"host_radius_solar":[1.5,1.5],"host_temperature_k":[45,45],"semi_major_axis_km":[2991957.414,2991957.414],"orbital_period_days":[0.22,0.21],"argument_of_periastron_deg":[6,330]},"host_mass_solar":1.01,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":9.09,"planets_in_system":1,"discovery_facility":"Roque de los Muchachos Observatory","host_temperature_k":4830,"orbital_period_days":139.35,"periastron_epoch_bjd":2456021.5,"equilibrium_temperature_k":964.55,"argument_of_periastron_deg":12},"designations":[{"catalog":"Exoplanet","designation":"HD 5583 b"},{"catalog":"Host star","designation":"HD 5583"}],"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."}