{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.664","julian_year":2026.664,"time":"2026-08-31T15:51:32.391Z","years_from_j2000":26.664,"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":"muscida","name":"Muscida","class":"g5iii_yellow_giant","category":"star","object_type":"G5III: yellow giant","mag":3.35,"mag_band":"V","abs_mag":-0.348,"abs_mag_band":"V","distance_ly":179.10844866677195,"distance_method":"parallax","ra_deg":127.56646500000001,"dec_deg":60.718169,"epoch_ra_deg":128.121018,"epoch_dec_deg":60.627515,"epoch_moved_arcsec":4.591,"pm_ra_mas_yr":-134.31,"pm_dec_mas_yr":-107.73,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ursa Major","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/muscida","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"08303+6043","age_years":292963060,"companions":[{"measured":2016,"magnitude":15.3,"components":"AB","discoverer_code":"BU 1067","separation_arcsec":6.8,"position_angle_deg":197},{"measured":2007,"magnitude":10.99,"components":"AC","discoverer_code":"BU 1067","separation_arcsec":141.1,"position_angle_deg":146},{"measured":2003,"magnitude":11.44,"components":"AD","discoverer_code":"BU 1067","separation_arcsec":163.9,"position_angle_deg":205}],"mass_solar":3.297,"radius_solar":15.452,"spectral_type":"G5III:","color_index_bv":0.856,"luminosity_solar":120.00518202042646,"radial_velocity_km_s":20,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality C)","surface_gravity_log_g":2.385,"surface_temperature_k":5114,"proper_motion_ra_mas_yr":-134.31,"proper_motion_dec_mas_yr":-107.73,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":136.5303},"designations":[{"catalog":"Bayer/Flamsteed","designation":"1 Omicron UMa"},{"catalog":"Common name","designation":"Muscida"},{"catalog":"Exoplanet host","designation":"ο UMa"},{"catalog":"HD","designation":"HD 71369"},{"catalog":"HIP","designation":"HIP 41704"},{"catalog":"HR","designation":"HR 3323"}],"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."}