{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T09:38:56.385Z","years_from_j2000":26.672,"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-31806","name":"HD 31806","class":"b7v_blue_white_main_sequence_star","category":"star","object_type":"B7V blue-white main-sequence star","mag":6.95,"mag_band":"V","abs_mag":1.748,"abs_mag_band":"V","distance_ly":358.0202250377806,"distance_method":"parallax","ra_deg":74.97395999999999,"dec_deg":27.325604,"epoch_ra_deg":75.392584,"epoch_dec_deg":27.36589,"epoch_moved_arcsec":0.746,"pm_ra_mas_yr":17.38,"pm_dec_mas_yr":-21.93,"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-31806","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"04599+2720","companions":[{"measured":2022,"magnitude":8.72,"components":"AB","discoverer_code":"STF 623","separation_arcsec":20.6,"position_angle_deg":206}],"mass_solar":3.671,"radius_solar":2.936,"spectral_type":"B7V","color_index_bv":0.148,"luminosity_solar":17.41004926352607,"variable_mag_max":6.869,"variable_mag_min":6.989,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":3.959,"surface_temperature_k":13164,"proper_motion_ra_mas_yr":17.38,"proper_motion_dec_mas_yr":-21.93,"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":228.9877},"designations":[{"catalog":"HD","designation":"HD 31806"},{"catalog":"HIP","designation":"HIP 23228"}],"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."}