{"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":"2026-09-03T00:03:16.760Z","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-29763","name":"94 τ Tau","class":"b3v_blue_white_main_sequence_star","category":"star","object_type":"B3V blue-white main-sequence star","mag":4.27,"mag_band":"V","abs_mag":-1.164,"abs_mag_band":"V","distance_ly":398.2372633485214,"distance_method":"parallax","ra_deg":70.56126,"dec_deg":22.956926,"epoch_ra_deg":70.964802,"epoch_dec_deg":23.008198,"epoch_moved_arcsec":0.547,"pm_ra_mas_yr":-2.84,"pm_dec_mas_yr":-20.33,"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-29763","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"04422+2257","companions":[{"measured":2022,"magnitude":6.97,"components":"Aa,Ab","discoverer_code":"MCA  16","separation_arcsec":0.4,"position_angle_deg":0},{"measured":2017,"magnitude":7.02,"components":"AB","discoverer_code":"S   455","separation_arcsec":62.5,"position_angle_deg":214}],"spectral_type":"B3V","color_index_bv":-0.112,"luminosity_solar":254.4485615146634,"radial_velocity_km_s":15,"spectral_type_source":"SIMBAD (1968ApJS...17..371L, quality C)","proper_motion_ra_mas_yr":-2.84,"proper_motion_dec_mas_yr":-20.33},"designations":[{"catalog":"Bayer/Flamsteed","designation":"94 Tau Tau"},{"catalog":"HD","designation":"HD 29763"},{"catalog":"HIP","designation":"HIP 21881"},{"catalog":"HR","designation":"HR 1497"}],"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."}