{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.664","julian_year":2026.664,"time":"2026-08-31T16:39:32.745Z","years_from_j2000":26.664,"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-85558","name":"8 γ Sex","class":"a0_1v_white_main_sequence_star","category":"star","object_type":"A0/1V white main-sequence star","mag":5.07,"mag_band":"V","abs_mag":0.42,"abs_mag_band":"V","distance_ly":277.5799514451225,"distance_method":"parallax","ra_deg":148.126815,"dec_deg":-8.10503,"epoch_ra_deg":148.458764,"epoch_dec_deg":-8.231307,"epoch_moved_arcsec":2.074,"pm_ra_mas_yr":-61.83,"pm_dec_mas_yr":-47.21,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sextans","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-85558","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"09525-0806","companions":[{"measured":2023,"magnitude":6.41,"components":"AB","discoverer_code":"AC    5","separation_arcsec":0.4,"position_angle_deg":30},{"measured":2016,"magnitude":12.28,"components":"AB,C","discoverer_code":"HJ 4256","separation_arcsec":34.4,"position_angle_deg":334}],"spectral_type":"A0/1V","color_index_bv":0.038,"luminosity_solar":59.1561634175474,"radial_velocity_km_s":12,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality D)","proper_motion_ra_mas_yr":-61.83,"proper_motion_dec_mas_yr":-47.21},"designations":[{"catalog":"Bayer/Flamsteed","designation":"8 Gamma Sex"},{"catalog":"HD","designation":"HD 85558"},{"catalog":"HIP","designation":"HIP 48437"},{"catalog":"HR","designation":"HR 3909"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}