{"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":"2026-08-27T17:05:49.887Z","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-34053","name":"108 Tau","class":"a2v_white_main_sequence_star","category":"star","object_type":"A2V white main-sequence star","mag":6.26,"mag_band":"V","abs_mag":-0.398,"abs_mag_band":"V","distance_ly":699.9064725390472,"distance_method":"parallax","ra_deg":78.86523,"dec_deg":22.284858,"epoch_ra_deg":79.269093,"epoch_dec_deg":22.315421,"epoch_moved_arcsec":0.319,"pm_ra_mas_yr":-9.97,"pm_dec_mas_yr":-6.64,"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-34053","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"05155+2217","companions":[{"measured":2016,"magnitude":11,"components":null,"discoverer_code":"COU 158","separation_arcsec":2,"position_angle_deg":350}],"spectral_type":"A2V","color_index_bv":0.075,"luminosity_solar":125.66085200763307,"radial_velocity_km_s":-11,"spectral_type_source":"SIMBAD (quality C)","surface_temperature_k":8790,"proper_motion_ra_mas_yr":-9.97,"proper_motion_dec_mas_yr":-6.64,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"108 Tau"},{"catalog":"HD","designation":"HD 34053"},{"catalog":"HIP","designation":"HIP 24512"},{"catalog":"HR","designation":"HR 1711"}],"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."}