{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T23:42:00.520Z","years_from_j2000":26.665,"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-200375","name":"HD 200375","class":"f5_6v_yellow_white_main_sequence_star","category":"star","object_type":"F5/6V yellow-white main-sequence star","mag":6.24,"mag_band":"V","abs_mag":1.989,"abs_mag_band":"V","distance_ly":230.98883904466345,"distance_method":"parallax","ra_deg":315.7626,"dec_deg":1.532061,"epoch_ra_deg":316.102834,"epoch_dec_deg":1.637442,"epoch_moved_arcsec":3.268,"pm_ra_mas_yr":-110.47,"pm_dec_mas_yr":-53.03,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Aquarius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-200375","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"21031+0132","companions":[{"measured":2020,"magnitude":7.33,"components":"AB","discoverer_code":"STF2744","separation_arcsec":1.2,"position_angle_deg":107},{"measured":2011,"magnitude":14.3,"components":"AD","discoverer_code":"STF2744","separation_arcsec":73.9,"position_angle_deg":300},{"measured":2000,"magnitude":12.9,"components":"AC","discoverer_code":"STF2744","separation_arcsec":97.8,"position_angle_deg":99}],"spectral_type":"F5/6V","color_index_bv":0.479,"luminosity_solar":13.944405388714603,"metallicity_fe_h":-0.02,"radial_velocity_km_s":7,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality D)","surface_gravity_log_g":3.74,"surface_temperature_k":6456,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-110.47,"proper_motion_dec_mas_yr":-53.03,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 200375"},{"catalog":"HIP","designation":"HIP 103892"},{"catalog":"HR","designation":"HR 8056"}],"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."}