{"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":"2026-09-08T07:32:53.741Z","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-1605-b","name":"HD 1605 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":289.6421927622208,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":5.1317548,"dec_deg":30.9750611,"epoch_ra_deg":5.482988,"epoch_dec_deg":31.124227,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 1605","semi_major_axis_km":223200023.08439997,"periapsis_km":null,"mass_kg":1.7728572619344052e+27,"mass_msun":0.000891595,"constellation":"Andromeda","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/hd-1605-b","radius_km":88017.78000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 1605","host_v_mag":7.52,"eccentricity":0.095,"uncertainties":{"mass_kg":[1.499525949601906e+26,1.499525949601906e+26],"distance_ly":[1.2146063506171525,1.2243910419486548],"eccentricity":[0.057,0.057],"host_mass_solar":[0.09,0.09],"host_radius_solar":[0.22,0.22],"semi_major_axis_km":[5684719.086599999,5684719.086599999],"orbital_period_days":[2.5,2.5],"argument_of_periastron_deg":[41,41]},"host_mass_solar":1.33,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":3.49,"planets_in_system":2,"discovery_facility":"Multiple Observatories","host_spectral_type":"K1 IV","host_temperature_k":4915,"orbital_period_days":577.2,"periastron_epoch_bjd":2463760,"equilibrium_temperature_k":362.48,"argument_of_periastron_deg":216},"designations":[{"catalog":"Exoplanet","designation":"HD 1605 b"},{"catalog":"Host star","designation":"HD 1605"}],"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."}