{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T13:56:28.056Z","years_from_j2000":26.667,"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":"wezen","name":"Wezen","class":"f8ia_yellow_white_supergiant","category":"star","object_type":"F8Ia yellow-white supergiant","mag":1.83,"mag_band":"V","abs_mag":-6.633,"abs_mag_band":"V","distance_ly":1606.6815415214714,"distance_method":"parallax","ra_deg":107.097855,"dec_deg":-26.3932,"epoch_ra_deg":107.37057,"epoch_dec_deg":-26.435247,"epoch_moved_arcsec":0.115,"pm_ra_mas_yr":-2.75,"pm_dec_mas_yr":3.33,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Canis Major","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/wezen","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"07084-2624","companions":[{"measured":1999,"magnitude":8.76,"components":null,"discoverer_code":"BU 1412","separation_arcsec":265.9,"position_angle_deg":225}],"spectral_type":"F8Ia","uncertainties":{"metallicity_fe_h":[0.213,0.213]},"color_index_bv":0.671,"luminosity_solar":39192.232245497704,"metallicity_fe_h":0.19,"radial_velocity_km_s":34,"spectral_type_source":"SIMBAD (2001AJ....121.2148G, quality C)","surface_gravity_log_g":0.95,"surface_temperature_k":6222,"metallicity_fe_h_source":"Median of 5 spectroscopic determinations in 7 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-2.75,"proper_motion_dec_mas_yr":3.33,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"25 Delta CMa"},{"catalog":"Common name","designation":"Wezen"},{"catalog":"HD","designation":"HD 54605"},{"catalog":"HIP","designation":"HIP 34444"},{"catalog":"HR","designation":"HR 2693"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}