{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T09:47:53.977Z","years_from_j2000":26.672,"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-51560","name":"HD 51560","class":"b6v_blue_white_main_sequence_star","category":"star","object_type":"B6V blue-white main-sequence star","mag":7.91,"mag_band":"V","abs_mag":0.184,"abs_mag_band":"V","distance_ly":1144.4083657539334,"distance_method":"parallax","ra_deg":104.86328999999999,"dec_deg":37.098182,"epoch_ra_deg":105.31684,"epoch_dec_deg":37.061457,"epoch_moved_arcsec":0.118,"pm_ra_mas_yr":-2.82,"pm_dec_mas_yr":-3.42,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Auriga","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-51560","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"06595+3706","companions":[{"measured":2015,"magnitude":12.8,"components":"AC","discoverer_code":"ALI 574","separation_arcsec":9.6,"position_angle_deg":120},{"measured":2017,"magnitude":8.14,"components":"AB","discoverer_code":"STF 994","separation_arcsec":26.4,"position_angle_deg":55},{"measured":2015,"magnitude":11.45,"components":"AF","discoverer_code":"SLE 781","separation_arcsec":57.5,"position_angle_deg":328},{"measured":2015,"magnitude":11.53,"components":"AD","discoverer_code":"GUI  12","separation_arcsec":101.2,"position_angle_deg":352},{"measured":2015,"magnitude":11.9,"components":"AG","discoverer_code":"SLE 781","separation_arcsec":181.7,"position_angle_deg":262},{"measured":2015,"magnitude":9.01,"components":"AE","discoverer_code":"BLO   1","separation_arcsec":207.1,"position_angle_deg":353},{"measured":2015,"magnitude":9.77,"components":"AJ","discoverer_code":"BOT   6","separation_arcsec":223.2,"position_angle_deg":124},{"measured":2015,"magnitude":11.69,"components":"AI","discoverer_code":"SLE 781","separation_arcsec":251.3,"position_angle_deg":31}],"mass_solar":4.069,"radius_solar":8.852,"spectral_type":"B6V","color_index_bv":-0.014,"luminosity_solar":73.51906920715662,"variable_mag_max":7.718,"variable_mag_min":7.938,"radial_velocity_km_s":8,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":3.093,"surface_temperature_k":9999,"proper_motion_ra_mas_yr":-2.82,"proper_motion_dec_mas_yr":-3.42,"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":461.0925},"designations":[{"catalog":"HD","designation":"HD 51560"},{"catalog":"HIP","designation":"HIP 33649"}],"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."}