{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-02T01:57:22.904Z","years_from_j2000":26.668,"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-22280","name":"HD 22280","class":"a0_white_star","category":"star","object_type":"A0 white star","mag":7.62,"mag_band":"V","abs_mag":1.75,"abs_mag_band":"V","distance_ly":486.8004615282151,"distance_method":"parallax","ra_deg":54.04728,"dec_deg":29.98331,"epoch_ra_deg":54.460654,"epoch_dec_deg":30.072365,"epoch_moved_arcsec":0.512,"pm_ra_mas_yr":4.56,"pm_dec_mas_yr":-18.64,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Taurus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-22280","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"03362+2959","age_years":439015000,"companions":[{"measured":2018,"magnitude":11.5,"components":null,"discoverer_code":"BU 1040","separation_arcsec":3.2,"position_angle_deg":338}],"mass_solar":2.393,"radius_solar":2.519,"spectral_type":"A0","color_index_bv":0.177,"luminosity_solar":17.378008287493753,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":4.045,"surface_temperature_k":9448,"proper_motion_ra_mas_yr":4.56,"proper_motion_dec_mas_yr":-18.64,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: above 7,500 K GSP-Phot's temperature and extinction are degenerate","bolometric_luminosity_solar":45.7066},"designations":[{"catalog":"HD","designation":"HD 22280"},{"catalog":"HIP","designation":"HIP 16795"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}