{"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":"2026-08-31T20:09:08.158Z","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-101545","name":"HD 101545","class":"o9_5ib_b0_5iab_blue_supergiant","category":"star","object_type":"O9.5Ib+B0.5Iab blue supergiant","mag":6.32,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":175.15419,"dec_deg":-62.568102,"epoch_ra_deg":175.469991,"epoch_dec_deg":-62.716864,"epoch_moved_arcsec":0.154,"pm_ra_mas_yr":-5.73,"pm_dec_mas_yr":0.61,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Centaurus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-101545","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"11406-6234","companions":[{"measured":2015,"magnitude":7.43,"components":"AB","discoverer_code":"CPO  11","separation_arcsec":2.6,"position_angle_deg":220}],"radius_solar":86.915,"spectral_type":"O9.5Ib+B0.5Iab","color_index_bv":0.029,"radial_velocity_km_s":-5.3,"spectral_type_source":"SIMBAD (1977ApJS...35..111G, quality C)","surface_gravity_log_g":1.708,"surface_temperature_k":10000,"proper_motion_ra_mas_yr":-5.73,"proper_motion_dec_mas_yr":0.61,"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"},"designations":[{"catalog":"HD","designation":"HD 101545"},{"catalog":"HIP","designation":"HIP 56961"}],"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."}