{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-03T01:44:10.100Z","years_from_j2000":26.671,"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":"albireo","name":"Albireo","class":"k3ii_b9_5v_orange_bright_giant","category":"star","object_type":"K3II+B9.5V orange bright giant","mag":3.05,"mag_band":"V","abs_mag":-2.572,"abs_mag_band":"V","distance_ly":434.2961339997514,"distance_method":"parallax","ra_deg":292.680345,"dec_deg":27.959681,"epoch_ra_deg":292.950619,"epoch_dec_deg":28.015483,"epoch_moved_arcsec":0.241,"pm_ra_mas_yr":-7.09,"pm_dec_mas_yr":-5.63,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cygnus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/albireo","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19307+2758","companions":[{"measured":2024,"magnitude":5.16,"components":"Aa,Ac","discoverer_code":"MCA  55","separation_arcsec":0.3,"position_angle_deg":32},{"measured":2012,"magnitude":11.5,"components":"AL","discoverer_code":"SMR  34","separation_arcsec":12,"position_angle_deg":269},{"measured":2024,"magnitude":4.68,"components":"AB","discoverer_code":"STFA 43","separation_arcsec":34.7,"position_angle_deg":54},{"measured":2023,"magnitude":12.5,"components":"AI","discoverer_code":"SMR  34","separation_arcsec":37.4,"position_angle_deg":132},{"measured":2023,"magnitude":12.5,"components":"AH","discoverer_code":"SMR  34","separation_arcsec":53.9,"position_angle_deg":118},{"measured":2022,"magnitude":12,"components":"AF","discoverer_code":"SMR  34","separation_arcsec":59.1,"position_angle_deg":45},{"measured":2023,"magnitude":10.99,"components":"AC","discoverer_code":"WAL 114","separation_arcsec":64.8,"position_angle_deg":339},{"measured":2023,"magnitude":11.81,"components":"AE","discoverer_code":"CTT  18","separation_arcsec":76.1,"position_angle_deg":205},{"measured":2023,"magnitude":12.24,"components":"AD","discoverer_code":"CTT  17","separation_arcsec":107.1,"position_angle_deg":32},{"measured":2023,"magnitude":10,"components":"AJ","discoverer_code":"SMR  34","separation_arcsec":139.1,"position_angle_deg":209},{"measured":2023,"magnitude":11.5,"components":"AK","discoverer_code":"SMR  34","separation_arcsec":142,"position_angle_deg":276},{"measured":2023,"magnitude":12.5,"components":"AG","discoverer_code":"SMR  34","separation_arcsec":161.2,"position_angle_deg":44}],"spectral_type":"K3II+B9.5V","color_index_bv":1.088,"luminosity_solar":930.6791831626532,"metallicity_fe_h":-0.17,"radial_velocity_km_s":-24,"spectral_type_source":"SIMBAD (1969PhDT.........5M, quality C)","surface_gravity_log_g":1.79,"surface_temperature_k":4270,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-7.09,"proper_motion_dec_mas_yr":-5.63,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"6 Beta1 Cyg"},{"catalog":"Common name","designation":"Albireo"},{"catalog":"HD","designation":"HD 183912"},{"catalog":"HIP","designation":"HIP 95947"},{"catalog":"HR","designation":"HR 7417"}],"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."}