{"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":"2026-09-02T01:42:46.008Z","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-15524","name":"HD 15524","class":"f6iv_yellow_white_subgiant","category":"star","object_type":"F6IV yellow-white subgiant","mag":5.88,"mag_band":"V","abs_mag":2.31,"abs_mag_band":"V","distance_ly":168.81788879343097,"distance_method":"parallax","ra_deg":37.63479,"dec_deg":25.235036,"epoch_ra_deg":38.021751,"epoch_dec_deg":25.353969,"epoch_moved_arcsec":2.547,"pm_ra_mas_yr":61.69,"pm_dec_mas_yr":-72.93,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Aries","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-15524","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"02305+2514","companions":[{"measured":2016,"magnitude":9.94,"components":"AB","discoverer_code":"STF 271","separation_arcsec":13,"position_angle_deg":184},{"measured":2022,"magnitude":12.7,"components":"AC","discoverer_code":"STF 271","separation_arcsec":115.8,"position_angle_deg":30}],"spectral_type":"F6IV","color_index_bv":0.412,"luminosity_solar":10.37528415818012,"metallicity_fe_h":0.09,"radial_velocity_km_s":-11,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":4.05,"surface_temperature_k":6668,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":61.69,"proper_motion_dec_mas_yr":-72.93,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 15524"},{"catalog":"HIP","designation":"HIP 11670"},{"catalog":"HR","designation":"HR 728"}],"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."}