{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T19:04:48.387Z","years_from_j2000":26.687,"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-191533","name":"HD 191533","class":"f7v_yellow_white_main_sequence_star","category":"star","object_type":"F7V yellow-white main-sequence star","mag":6.57,"mag_band":"V","abs_mag":2.582,"abs_mag_band":"V","distance_ly":204.61518202973215,"distance_method":"parallax","ra_deg":302.532465,"dec_deg":8.443402,"epoch_ra_deg":302.857348,"epoch_dec_deg":8.520981,"epoch_moved_arcsec":4.887,"pm_ra_mas_yr":-61.39,"pm_dec_mas_yr":-172.53,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Aquila","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-191533","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20101+0827","companions":[{"measured":2020,"magnitude":10.19,"components":"AB","discoverer_code":"STF2635","separation_arcsec":7.7,"position_angle_deg":80},{"measured":2015,"magnitude":13.2,"components":"AC","discoverer_code":"STF2635","separation_arcsec":88.9,"position_angle_deg":38},{"measured":2011,"magnitude":13.3,"components":"AD","discoverer_code":"GMC   9","separation_arcsec":127.5,"position_angle_deg":37}],"spectral_type":"F7V","uncertainties":{"metallicity_fe_h":[0.045,0.045]},"color_index_bv":0.524,"luminosity_solar":8.076068613289758,"metallicity_fe_h":-0.055,"radial_velocity_km_s":17,"spectral_type_source":"SIMBAD (1985ApJS...59...95A, quality C)","surface_gravity_log_g":3.82,"surface_temperature_k":6254,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 3 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-61.39,"proper_motion_dec_mas_yr":-172.53,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 191533"},{"catalog":"HIP","designation":"HIP 99367"}],"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."}