{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T13:50:32.872Z","years_from_j2000":26.67,"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-31764","name":"HD 31764","class":"b7iiie_blue_white_giant","category":"star","object_type":"B7IIIe blue-white giant","mag":6.14,"mag_band":"V","abs_mag":-1.578,"abs_mag_band":"V","distance_ly":1140.4067531557266,"distance_method":"parallax","ra_deg":74.74755,"dec_deg":14.54324,"epoch_ra_deg":75.128955,"epoch_dec_deg":14.584293,"epoch_moved_arcsec":0.173,"pm_ra_mas_yr":6.17,"pm_dec_mas_yr":-2.05,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Orion","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-31764","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"04590+1433","companions":[{"measured":2020,"magnitude":7.43,"components":"AB","discoverer_code":"SHJ  49","separation_arcsec":39.3,"position_angle_deg":306},{"measured":2016,"magnitude":9.6,"components":"AC","discoverer_code":"SHJ  49","separation_arcsec":54,"position_angle_deg":88},{"measured":2016,"magnitude":13.2,"components":"AD","discoverer_code":"WAL  34","separation_arcsec":88.9,"position_angle_deg":292}],"spectral_type":"B7IIIe","color_index_bv":0.156,"luminosity_solar":372.5632384666039,"radial_velocity_km_s":4,"spectral_type_source":"SIMBAD (2018A&A...609A.108S, quality C)","surface_temperature_k":11776,"proper_motion_ra_mas_yr":6.17,"proper_motion_dec_mas_yr":-2.05,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 31764"},{"catalog":"HIP","designation":"HIP 23161"},{"catalog":"HR","designation":"HR 1600"}],"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."}