{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T17:05:49.162Z","years_from_j2000":26.654,"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-35943","name":"118 Tau","class":"b9v_blue_white_main_sequence_star","category":"star","object_type":"B9V blue-white main-sequence star","mag":5.47,"mag_band":"V","abs_mag":-0.106,"abs_mag_band":"V","distance_ly":425.23648829591343,"distance_method":"parallax","ra_deg":82.31874,"dec_deg":25.150215,"epoch_ra_deg":82.732237,"epoch_dec_deg":25.17167,"epoch_moved_arcsec":1.041,"pm_ra_mas_yr":11.44,"pm_dec_mas_yr":-37.36,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Taurus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-35943","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"05293+2509","companions":[{"measured":2022,"magnitude":6.68,"components":"AB","discoverer_code":"STF 716","separation_arcsec":4.7,"position_angle_deg":209},{"measured":2001,"magnitude":11.89,"components":"AC","discoverer_code":"STF 716","separation_arcsec":140.2,"position_angle_deg":99}],"mass_solar":2.901,"radius_solar":2.132,"spectral_type":"B9V","color_index_bv":-0.042,"luminosity_solar":96.02846792093811,"radial_velocity_km_s":15,"spectral_type_source":"SIMBAD (1959ApJ...130..159O, quality C)","surface_gravity_log_g":4.147,"surface_temperature_k":11734,"proper_motion_ra_mas_yr":11.44,"proper_motion_dec_mas_yr":-37.36,"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":77.8663},"designations":[{"catalog":"Bayer/Flamsteed","designation":"118 Tau"},{"catalog":"HD","designation":"HD 35943"},{"catalog":"HIP","designation":"HIP 25695"},{"catalog":"HR","designation":"HR 1821"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T16:03:54.983Z","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."}