{"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":"2026-09-05T10:20:18.312Z","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-193063","name":"HD 193063","class":"b9v_blue_white_main_sequence_star","category":"star","object_type":"B9V blue-white main-sequence star","mag":7.72,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":304.20222,"dec_deg":39.697319,"epoch_ra_deg":304.442654,"epoch_dec_deg":39.779719,"epoch_moved_arcsec":0.115,"pm_ra_mas_yr":2.75,"pm_dec_mas_yr":-3.31,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cygnus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-193063","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20168+3942","companions":[{"measured":2018,"magnitude":8.66,"components":"AB","discoverer_code":"STF2663","separation_arcsec":5.4,"position_angle_deg":322},{"measured":1998,"magnitude":14,"components":"AF","discoverer_code":"DAM1040","separation_arcsec":22.3,"position_angle_deg":123},{"measured":2015,"magnitude":11.7,"components":"AC","discoverer_code":"CTT  21","separation_arcsec":103,"position_angle_deg":188}],"mass_solar":3.922,"radius_solar":4.558,"spectral_type":"B9V","color_index_bv":-0.06,"radial_velocity_km_s":-10,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":3.746,"surface_temperature_k":12569,"proper_motion_ra_mas_yr":2.75,"proper_motion_dec_mas_yr":-3.31,"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":368.6159},"designations":[{"catalog":"HD","designation":"HD 193063"},{"catalog":"HIP","designation":"HIP 99954"}],"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."}