{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-04T21:32:28.937Z","years_from_j2000":26.676,"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-147001","name":"HD 147001","class":"b7v_blue_white_main_sequence_star","category":"star","object_type":"B7V blue-white main-sequence star","mag":6.51,"mag_band":"V","abs_mag":0.824,"abs_mag_band":"V","distance_ly":447.4024018819211,"distance_method":"parallax","ra_deg":245.36265000000003,"dec_deg":-48.188624,"epoch_ra_deg":245.857981,"epoch_dec_deg":-48.252622,"epoch_moved_arcsec":0.707,"pm_ra_mas_yr":-13.24,"pm_dec_mas_yr":-22.98,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Norma","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-147001","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16215-4811","companions":[{"measured":2000,"magnitude":17.15,"components":"AB","discoverer_code":"SHT  64","separation_arcsec":5,"position_angle_deg":159},{"measured":2000,"magnitude":17.25,"components":"AC","discoverer_code":"SHT  64","separation_arcsec":5.3,"position_angle_deg":357},{"measured":2016,"magnitude":15.73,"components":"AD","discoverer_code":"SHT  64","separation_arcsec":5.9,"position_angle_deg":118},{"measured":2000,"magnitude":15.88,"components":"AE","discoverer_code":"SHT  64","separation_arcsec":6.3,"position_angle_deg":72},{"measured":2000,"magnitude":17.02,"components":"AF","discoverer_code":"SHT  64","separation_arcsec":6.9,"position_angle_deg":151},{"measured":2016,"magnitude":12.2,"components":"AI","discoverer_code":"KOU  61","separation_arcsec":8.9,"position_angle_deg":43},{"measured":2016,"magnitude":14.5,"components":"AG","discoverer_code":"SHT  64","separation_arcsec":9,"position_angle_deg":75},{"measured":2016,"magnitude":9.49,"components":"AH","discoverer_code":"SHT  64","separation_arcsec":9,"position_angle_deg":217}],"mass_solar":3.175,"radius_solar":2.76,"spectral_type":"B7V","color_index_bv":-0.047,"luminosity_solar":40.77556617502125,"radial_velocity_km_s":-14,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality C)","surface_gravity_log_g":3.941,"surface_temperature_k":11868,"proper_motion_ra_mas_yr":-13.24,"proper_motion_dec_mas_yr":-22.98,"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":131.8796},"designations":[{"catalog":"HD","designation":"HD 147001"},{"catalog":"HIP","designation":"HIP 80142"}],"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."}