{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T08:27:29.312Z","years_from_j2000":26.677,"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-5608-b","name":"HD 5608 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":189.53110187308818,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":14.5594349,"dec_deg":33.9505774,"epoch_ra_deg":14.927776,"epoch_dec_deg":34.095767,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 5608","semi_major_axis_km":267780188.55299997,"periapsis_km":null,"mass_kg":2.2170095325397382e+27,"mass_msun":0.00111497,"constellation":"Andromeda","discovered":"2012","featured":false,"url":"https://spacecatalog.org/object/hd-5608-b","radius_km":87379.97,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 5608","host_v_mag":6.00272,"eccentricity":0.11,"uncertainties":{"mass_kg":[1.0819310219210524e+26,1.1768372516102801e+26],"distance_ly":[0.7204794383762863,0.7204794383762863],"eccentricity":[0.08,0.029],"host_mass_solar":[0.23,0.23],"host_radius_solar":[0.62,0.7],"semi_major_axis_km":[448793.61209999997,1047185.0948999999],"orbital_period_days":[1.67,4.72],"argument_of_periastron_deg":[69.1,15.4]},"host_mass_solar":1.29,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":5.43,"planets_in_system":1,"discovery_facility":"Okayama Astrophysical Observatory","host_spectral_type":"K0 IV","host_temperature_k":4807,"orbital_period_days":768.7,"periastron_epoch_bjd":2453936.4,"equilibrium_temperature_k":403.72,"argument_of_periastron_deg":-91.9},"designations":[{"catalog":"Exoplanet","designation":"HD 5608 b"},{"catalog":"Host star","designation":"HD 5608"}],"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."}