{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T16:09:22.141Z","years_from_j2000":26.681,"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-5319-b","name":"HD 5319 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":395.97015036701237,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":13.7558096,"dec_deg":0.7893425,"epoch_ra_deg":14.100533,"epoch_dec_deg":0.935059,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 5319","semi_major_axis_km":234868656.99899998,"periapsis_km":null,"mass_kg":2.9534966804817283e+27,"mass_msun":0.00148536,"constellation":"Cetus","discovered":"2007","featured":false,"url":"https://spacecatalog.org/object/hd-5319-b","radius_km":86104.35,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 5319","host_v_mag":8.05,"eccentricity":0.092,"uncertainties":{"mass_kg":[7.972163276364562e+25,7.972163276364562e+25],"distance_ly":[2.30755637234596,2.30755637234596],"eccentricity":[0.025,0.025],"semi_major_axis_km":[16455765.776999999,16455765.776999999],"orbital_period_days":[1.4,1.4],"argument_of_periastron_deg":[15,15]},"host_mass_solar":1.27,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":4.06,"planets_in_system":2,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"G5","host_temperature_k":4871,"orbital_period_days":637.1,"periastron_epoch_bjd":2456382,"equilibrium_temperature_k":377.72,"argument_of_periastron_deg":158},"designations":[{"catalog":"Exoplanet","designation":"HD 5319 b"}],"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."}