{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-03T02:09:23.653Z","years_from_j2000":26.671,"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-29140","name":"88 Tau","class":"ka4ha6ma7_white_star","category":"star","object_type":"kA4hA6mA7 white star","mag":4.25,"mag_band":"V","abs_mag":0.849,"abs_mag_band":"V","distance_ly":156.20509551074676,"distance_method":"parallax","ra_deg":68.913585,"dec_deg":10.16079,"epoch_ra_deg":69.282904,"epoch_dec_deg":10.21588,"epoch_moved_arcsec":1.841,"pm_ra_mas_yr":44.89,"pm_dec_mas_yr":-52.42,"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-29140","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"04357+1010","companions":[{"measured":2021,"magnitude":6.61,"components":"Aa,Ab","discoverer_code":"CHR  18","separation_arcsec":0.1,"position_angle_deg":193},{"measured":2017,"magnitude":7.84,"components":"AB","discoverer_code":"SHJ  45","separation_arcsec":69.2,"position_angle_deg":300}],"spectral_type":"kA4hA6mA7","color_index_bv":0.184,"luminosity_solar":39.847400971777496,"metallicity_fe_h":0.27,"radial_velocity_km_s":29,"spectral_type_source":"SIMBAD (1995ApJS...99..135A, quality D)","surface_gravity_log_g":4,"surface_temperature_k":8400,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":44.89,"proper_motion_dec_mas_yr":-52.42,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"88 Tau"},{"catalog":"HD","designation":"HD 29140"},{"catalog":"HIP","designation":"HIP 21402"},{"catalog":"HR","designation":"HR 1458"}],"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."}