{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-01T22:15:56.431Z","years_from_j2000":26.668,"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-38899","name":"134 Tau","class":"b9v_blue_white_main_sequence_star","category":"star","object_type":"B9V blue-white main-sequence star","mag":4.89,"mag_band":"V","abs_mag":0.478,"abs_mag_band":"V","distance_ly":248.78458332564438,"distance_method":"parallax","ra_deg":87.38721000000001,"dec_deg":12.651324,"epoch_ra_deg":87.764549,"epoch_dec_deg":12.659827,"epoch_moved_arcsec":0.739,"pm_ra_mas_yr":-21.63,"pm_dec_mas_yr":-17.35,"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-38899","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"05495+1239","age_years":298918300,"companions":[{"measured":2010,"magnitude":10.56,"components":null,"discoverer_code":"BUP  84","separation_arcsec":120.1,"position_angle_deg":129}],"mass_solar":2.84,"radius_solar":3.074,"spectral_type":"B9V","uncertainties":{"metallicity_fe_h":[0.066,0.066]},"color_index_bv":-0.068,"luminosity_solar":56.078966337451,"metallicity_fe_h":0,"radial_velocity_km_s":18,"spectral_type_source":"SIMBAD (2024A&A...690A.176N, quality C)","surface_gravity_log_g":3.924,"surface_temperature_k":10471,"metallicity_fe_h_source":"Median of 3 spectroscopic determinations in 4 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-21.63,"proper_motion_dec_mas_yr":-17.35,"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":94.2865},"designations":[{"catalog":"Bayer/Flamsteed","designation":"134 Tau"},{"catalog":"HD","designation":"HD 38899"},{"catalog":"HIP","designation":"HIP 27511"},{"catalog":"HR","designation":"HR 2010"}],"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."}