{"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":"2026-09-05T02:17:30.426Z","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-232161","name":"HD 232161","class":"b3_blue_white_star","category":"star","object_type":"B3 blue-white star","mag":8.95,"mag_band":"V","abs_mag":1.658,"abs_mag_band":"V","distance_ly":937.2308992208583,"distance_method":"parallax","ra_deg":5.069249999999999,"dec_deg":54.200992,"epoch_ra_deg":5.429242,"epoch_dec_deg":54.350078,"epoch_moved_arcsec":0.08,"pm_ra_mas_yr":0.75,"pm_dec_mas_yr":-2.89,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cassiopeia","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-232161","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00203+5412","companions":[{"measured":2019,"magnitude":10.34,"components":null,"discoverer_code":"HDS  44","separation_arcsec":12.2,"position_angle_deg":39}],"mass_solar":6.55,"radius_solar":6.625,"spectral_type":"B3","color_index_bv":-0.033,"luminosity_solar":18.914723628330144,"radial_velocity_km_s":-53,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":3.648,"surface_temperature_k":17575,"proper_motion_ra_mas_yr":0.75,"proper_motion_dec_mas_yr":-2.89,"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":2503.0498},"designations":[{"catalog":"HD","designation":"HD 232161"},{"catalog":"HIP","designation":"HIP 1621"}],"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."}