{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T07:10:19.158Z","years_from_j2000":26.683,"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-137050","name":"UU CrB","class":"f8_yellow_white_star","category":"star","object_type":"F8 yellow-white star","mag":8.63,"mag_band":"V","abs_mag":3.976,"abs_mag_band":"V","distance_ly":278.0532043491895,"distance_method":"parallax","ra_deg":230.72016,"dec_deg":31.553675,"epoch_ra_deg":230.993793,"epoch_dec_deg":31.456572,"epoch_moved_arcsec":3.463,"pm_ra_mas_yr":-46.12,"pm_dec_mas_yr":-121.3,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Corona Borealis","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-137050","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":3436056100,"mass_solar":1.116,"radius_solar":1.184,"spectral_type":"F8","color_index_bv":0.55,"luminosity_solar":2.236660149466176,"variable_mag_max":8.586,"variable_mag_min":8.666,"variable_epoch_hjd":2444381.753,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","variable_designation":"UU CrB","surface_gravity_log_g":4.263,"surface_temperature_k":6101,"proper_motion_ra_mas_yr":-46.12,"proper_motion_dec_mas_yr":-121.3,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":1.7414},"designations":[{"catalog":"HD","designation":"HD 137050"},{"catalog":"HIP","designation":"HIP 75283"},{"catalog":"Variable star","designation":"UU CrB"}],"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."}