{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-02T01:31:07.289Z","years_from_j2000":26.668,"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-76728","name":"HD 76728","class":"b8ii_iii_blue_white_bright_giant","category":"star","object_type":"B8II-III blue-white bright giant","mag":3.84,"mag_band":"V","abs_mag":-1.117,"abs_mag_band":"V","distance_ly":319.7611034624735,"distance_method":"parallax","ra_deg":133.761855,"dec_deg":-60.644609,"epoch_ra_deg":133.91049,"epoch_dec_deg":-60.746151,"epoch_moved_arcsec":1.354,"pm_ra_mas_yr":-28.18,"pm_dec_mas_yr":42.24,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Carina","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-76728","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"08550-6039","companions":[{"measured":2015,"magnitude":12.8,"components":null,"discoverer_code":"HJ 4156","separation_arcsec":17.9,"position_angle_deg":317}],"spectral_type":"B8II-III","color_index_bv":-0.104,"luminosity_solar":243.6688423459584,"radial_velocity_km_s":25,"spectral_type_source":"SIMBAD (2021MNRAS.502.3670G, quality C)","proper_motion_ra_mas_yr":-28.18,"proper_motion_dec_mas_yr":42.24},"designations":[{"catalog":"HD","designation":"HD 76728"},{"catalog":"HIP","designation":"HIP 43783"},{"catalog":"HR","designation":"HR 3571"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}