{"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":"2026-09-03T04:01:35.271Z","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":"hd-80533","name":"HD 80533","class":"g0_yellow_star","category":"star","object_type":"G0 yellow star","mag":8.93,"mag_band":"V","abs_mag":4.992,"abs_mag_band":"V","distance_ly":199.97332446206744,"distance_method":"parallax","ra_deg":140.91529500000001,"dec_deg":66.137262,"epoch_ra_deg":141.473052,"epoch_dec_deg":66.021666,"epoch_moved_arcsec":2.96,"pm_ra_mas_yr":-82.6,"pm_dec_mas_yr":-74.12,"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/hd-80533","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":2984393600,"mass_solar":0.972,"radius_solar":0.914,"spectral_type":"G0","uncertainties":{"metallicity_fe_h":[0.015,0.015]},"color_index_bv":0.678,"luminosity_solar":0.8774047879567531,"metallicity_fe_h":-0.085,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":4.434,"surface_temperature_k":5613,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 2 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-82.6,"proper_motion_dec_mas_yr":-74.12,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.745},"designations":[{"catalog":"HD","designation":"HD 80533"},{"catalog":"HIP","designation":"HIP 46066"}],"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."}