{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T09:27:52.106Z","years_from_j2000":26.677,"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-27946","name":"67 κ² Tau","class":"f0vn_yellow_white_main_sequence_star","category":"star","object_type":"F0Vn yellow-white main-sequence star","mag":5.27,"mag_band":"V","abs_mag":1.985,"abs_mag_band":"V","distance_ly":148.0508599114505,"distance_method":"parallax","ra_deg":66.35421,"dec_deg":22.199998,"epoch_ra_deg":66.754954,"epoch_dec_deg":22.261243,"epoch_moved_arcsec":3.252,"pm_ra_mas_yr":112.45,"pm_dec_mas_yr":-47.06,"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-27946","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"04254+2218","age_years":1139195700,"companions":[{"measured":2014,"magnitude":13.7,"components":"BF","discoverer_code":"STF 541","separation_arcsec":108.3,"position_angle_deg":216},{"measured":2014,"magnitude":9.5,"components":"B,CD","discoverer_code":"STF 541","separation_arcsec":163.3,"position_angle_deg":350}],"mass_solar":1.751,"radius_solar":2.207,"spectral_type":"F0Vn","color_index_bv":0.25,"luminosity_solar":13.995873225726179,"radial_velocity_km_s":32,"spectral_type_source":"SIMBAD (2001AJ....121.2148G, quality C)","surface_gravity_log_g":3.946,"surface_temperature_k":7491,"proper_motion_ra_mas_yr":112.45,"proper_motion_dec_mas_yr":-47.06,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":12.987},"designations":[{"catalog":"Bayer/Flamsteed","designation":"67 Kappa2 Tau"},{"catalog":"HD","designation":"HD 27946"},{"catalog":"HIP","designation":"HIP 20641"},{"catalog":"HR","designation":"HR 1388"}],"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."}