{"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":"2026-09-01T19:39:48.686Z","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-285683","name":"HD 285683","class":"f8_yellow_white_star","category":"star","object_type":"F8 yellow-white star","mag":9.17,"mag_band":"V","abs_mag":2.585,"abs_mag_band":"V","distance_ly":676.6730491287726,"distance_method":"parallax","ra_deg":65.386995,"dec_deg":16.802954,"epoch_ra_deg":65.772177,"epoch_dec_deg":16.866073,"epoch_moved_arcsec":2.992,"pm_ra_mas_yr":39.1,"pm_dec_mas_yr":-105.18,"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-285683","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"04215+1648","age_years":4605155500,"companions":[{"measured":1977,"magnitude":9.8,"components":null,"discoverer_code":"OCC 528","separation_arcsec":0.1,"position_angle_deg":-1}],"mass_solar":1.179,"radius_solar":1.468,"spectral_type":"F8","color_index_bv":0.554,"luminosity_solar":8.053784411990664,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1995A&AS..110..367N, quality E)","surface_gravity_log_g":4.073,"surface_temperature_k":6054,"proper_motion_ra_mas_yr":39.1,"proper_motion_dec_mas_yr":-105.18,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":2.6152},"designations":[{"catalog":"HD","designation":"HD 285683"},{"catalog":"HIP","designation":"HIP 20352"}],"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."}