{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T16:16:11.006Z","years_from_j2000":26.678,"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":"hip-66074-b","name":"HIP 66074 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":115.60221420516712,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":203.1635632,"dec_deg":75.0071038,"epoch_ra_deg":203.296368,"epoch_dec_deg":74.868785,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HIP 66074","semi_major_axis_km":119528698.6893,"periapsis_km":null,"mass_kg":9.490622998783604e+27,"mass_msun":0.00477297,"constellation":"Ursa Minor","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/hip-66074-b","radius_km":82277.49,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HIP 66074","host_v_mag":10.25,"eccentricity":0.948,"uncertainties":{"mass_kg":[3.7962491995134415e+27,3.7962491995134415e+27],"distance_ly":[0.08480065820635328,0.08512681458407004],"eccentricity":[0.004,0.004],"host_mass_solar":[0.023,0.025],"host_radius_solar":[0.012,0.013],"host_temperature_k":[60,60],"semi_major_axis_km":[5235925.4745000005,5235925.4745000005],"orbital_period_days":[17.7,21.7],"argument_of_periastron_deg":[2,2]},"host_mass_solar":0.705,"inclination_deg":13,"stars_in_system":1,"discovery_method":"Astrometry","host_radius_solar":0.69,"planets_in_system":1,"discovery_facility":"European Space Agency (ESA) Gaia Satellite","host_temperature_k":4300,"orbital_period_days":310.9,"periastron_epoch_bjd":2459962.48,"equilibrium_temperature_k":192.69,"argument_of_periastron_deg":-155},"designations":[{"catalog":"Exoplanet","designation":"HIP 66074 b"},{"catalog":"Host star","designation":"HIP 66074"}],"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."}