{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T13:01:41.626Z","years_from_j2000":26.675,"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-186828","name":"HD 186828","class":"g1v_yellow_main_sequence_star","category":"star","object_type":"G1V yellow main-sequence star","mag":8.12,"mag_band":"V","abs_mag":2.946,"abs_mag_band":"V","distance_ly":353.365647371385,"distance_method":"parallax","ra_deg":296.87853,"dec_deg":-21.827755,"epoch_ra_deg":297.277009,"epoch_dec_deg":-21.761773,"epoch_moved_arcsec":2.443,"pm_ra_mas_yr":91.44,"pm_dec_mas_yr":-5.2,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sagittarius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-186828","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19475-2150","companions":[{"measured":2025,"magnitude":9.31,"components":"AB","discoverer_code":"STN  49","separation_arcsec":1.4,"position_angle_deg":330}],"radius_solar":1.775,"spectral_type":"G1V","color_index_bv":0.612,"luminosity_solar":5.7756384639453335,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality C)","surface_gravity_log_g":3.823,"surface_temperature_k":6166,"proper_motion_ra_mas_yr":91.44,"proper_motion_dec_mas_yr":-5.2,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)"},"designations":[{"catalog":"HD","designation":"HD 186828"},{"catalog":"HIP","designation":"HIP 97383"}],"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."}