{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T08:10:04.343Z","years_from_j2000":26.669,"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-74804","name":"HD 74804","class":"b3_5ii_blue_white_bright_giant","category":"star","object_type":"B3/5II blue-white bright giant","mag":7.34,"mag_band":"V","abs_mag":-2.617,"abs_mag_band":"V","distance_ly":3197.6116869374905,"distance_method":"parallax","ra_deg":131.168025,"dec_deg":-41.277218,"epoch_ra_deg":131.411869,"epoch_dec_deg":-41.374092,"epoch_moved_arcsec":0.202,"pm_ra_mas_yr":-6.85,"pm_dec_mas_yr":3.22,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Vela","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-74804","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"08447-4117","companions":[{"measured":2015,"magnitude":10.94,"components":"AB","discoverer_code":"I   815","separation_arcsec":4.4,"position_angle_deg":1},{"measured":2015,"magnitude":13.3,"components":"AC","discoverer_code":"I   815","separation_arcsec":8.2,"position_angle_deg":130},{"measured":2015,"magnitude":10.72,"components":"AD","discoverer_code":"I   815","separation_arcsec":35.3,"position_angle_deg":226}],"spectral_type":"B3/5II","color_index_bv":0.324,"luminosity_solar":970.0631337839573,"radial_velocity_km_s":25,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality D)","proper_motion_ra_mas_yr":-6.85,"proper_motion_dec_mas_yr":3.22},"designations":[{"catalog":"HD","designation":"HD 74804"},{"catalog":"HIP","designation":"HIP 42908"}],"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."}