{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T12:33:09.493Z","years_from_j2000":26.675,"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-8533","name":"HIP 8533","class":"orange_star","category":"star","object_type":"Orange star","mag":9.39,"mag_band":"V","abs_mag":4.557,"abs_mag_band":"V","distance_ly":301.9966701937534,"distance_method":"parallax","ra_deg":27.505335,"dec_deg":74.933271,"epoch_ra_deg":28.107703,"epoch_dec_deg":75.066308,"epoch_moved_arcsec":5.256,"pm_ra_mas_yr":193.51,"pm_dec_mas_yr":-37.21,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cassiopeia","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-8533","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"01500+7456","companions":[{"measured":2018,"magnitude":10.2,"components":"AB","discoverer_code":"BAG  16","separation_arcsec":0.1,"position_angle_deg":118},{"measured":2018,"magnitude":10.72,"components":"AC","discoverer_code":"MLR 297","separation_arcsec":0.2,"position_angle_deg":259},{"measured":1999,"magnitude":10.72,"components":"BC","discoverer_code":"BAG  16","separation_arcsec":0.2,"position_angle_deg":175}],"color_index_bv":0.892,"luminosity_solar":1.3097849623996851,"radial_velocity_km_s":0,"proper_motion_ra_mas_yr":193.51,"proper_motion_dec_mas_yr":-37.21},"designations":[{"catalog":"HIP","designation":"HIP 8533"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"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."}