{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T06:45:07.821Z","years_from_j2000":26.682,"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-145964","name":"HD 145964","class":"b9v_blue_white_main_sequence_star","category":"star","object_type":"B9V blue-white main-sequence star","mag":6.41,"mag_band":"V","abs_mag":1.229,"abs_mag_band":"V","distance_ly":354.51795785385826,"distance_method":"parallax","ra_deg":243.62035500000002,"dec_deg":-21.107636,"epoch_ra_deg":244.015987,"epoch_dec_deg":-21.175915,"epoch_moved_arcsec":0.902,"pm_ra_mas_yr":-16.07,"pm_dec_mas_yr":-29.73,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Scorpius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-145964","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16145-2106","age_years":274881750,"companions":[{"measured":2016,"magnitude":15.44,"components":"AB","discoverer_code":"SHT  63","separation_arcsec":5.1,"position_angle_deg":93},{"measured":2000,"magnitude":16.41,"components":"AC","discoverer_code":"SHT  63","separation_arcsec":5.7,"position_angle_deg":97}],"mass_solar":2.403,"radius_solar":2.051,"spectral_type":"B9V","color_index_bv":0.002,"luminosity_solar":28.08018728116636,"radial_velocity_km_s":-8,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality C)","surface_gravity_log_g":4.03,"surface_temperature_k":10036,"proper_motion_ra_mas_yr":-16.07,"proper_motion_dec_mas_yr":-29.73,"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":40.4681},"designations":[{"catalog":"HD","designation":"HD 145964"},{"catalog":"HIP","designation":"HIP 79599"},{"catalog":"HR","designation":"HR 6051"}],"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."}