{"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":"2026-09-04T16:20:15.276Z","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":"hd-192876","name":"5 α¹ Cap","class":"g3ib_yellow_supergiant","category":"star","object_type":"G3Ib yellow supergiant","mag":4.3,"mag_band":"V","abs_mag":-1.909,"abs_mag_band":"V","distance_ly":569.2084365476384,"distance_method":"parallax","ra_deg":304.41195,"dec_deg":-12.508212,"epoch_ra_deg":304.783724,"epoch_dec_deg":-12.425194,"epoch_moved_arcsec":0.594,"pm_ra_mas_yr":22.24,"pm_dec_mas_yr":0.75,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Capricornus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-192876","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20176-1230","companions":[{"measured":2023,"magnitude":8.6,"components":"Aa,Ab","discoverer_code":"WZ   15","separation_arcsec":0.7,"position_angle_deg":339},{"measured":2020,"magnitude":9.6,"components":"AC","discoverer_code":"HJ  607","separation_arcsec":47.4,"position_angle_deg":228},{"measured":2008,"magnitude":14.1,"components":"AB","discoverer_code":"BU  295","separation_arcsec":53.2,"position_angle_deg":212}],"spectral_type":"G3Ib","color_index_bv":0.928,"luminosity_solar":505.3589947531675,"metallicity_fe_h":0.22,"radial_velocity_km_s":-26,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality C)","surface_gravity_log_g":1.89,"surface_temperature_k":5251,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":22.24,"proper_motion_dec_mas_yr":0.75,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"5 Alpha1 Cap"},{"catalog":"HD","designation":"HD 192876"},{"catalog":"HIP","designation":"HIP 100027"},{"catalog":"HR","designation":"HR 7747"}],"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."}