{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-09-01T00:12:53.438Z","years_from_j2000":26.665,"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-73666","name":"HD 73666","class":"a1v_white_main_sequence_star","category":"star","object_type":"A1V white main-sequence star","mag":6.61,"mag_band":"V","abs_mag":0.331,"abs_mag_band":"V","distance_ly":587.6692136827837,"distance_method":"parallax","ra_deg":130.04772,"dec_deg":19.971131,"epoch_ra_deg":130.433316,"epoch_dec_deg":19.876242,"epoch_moved_arcsec":1.011,"pm_ra_mas_yr":-34.84,"pm_dec_mas_yr":-14.92,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cancer","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-73666","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"08401+2000","age_years":348898300,"companions":[{"measured":1987,"magnitude":null,"components":"Ba,Bb","discoverer_code":"CHR  28","separation_arcsec":0.4,"position_angle_deg":134},{"measured":2015,"magnitude":11.63,"components":"BR","discoverer_code":"BUP 120","separation_arcsec":140.3,"position_angle_deg":147}],"mass_solar":2.781,"radius_solar":3.273,"spectral_type":"A1V","uncertainties":{"metallicity_fe_h":[0.258,0.258]},"color_index_bv":0.006,"luminosity_solar":64.2096052567594,"metallicity_fe_h":0.445,"radial_velocity_km_s":33.8,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":3.753,"surface_temperature_k":9999,"metallicity_fe_h_source":"Median of 4 spectroscopic determinations in 4 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-34.84,"proper_motion_dec_mas_yr":-14.92,"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":90.9116},"designations":[{"catalog":"HD","designation":"HD 73666"},{"catalog":"HIP","designation":"HIP 42523"}],"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."}