{"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":"2026-08-31T23:07:24.926Z","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-201876","name":"HD 201876","class":"f8_yellow_white_star","category":"star","object_type":"F8 yellow-white star","mag":8.08,"mag_band":"V","abs_mag":3.754,"abs_mag_band":"V","distance_ly":239.11763444649785,"distance_method":"parallax","ra_deg":318.031575,"dec_deg":10.637987,"epoch_ra_deg":318.357708,"epoch_dec_deg":10.747845,"epoch_moved_arcsec":4.591,"pm_ra_mas_yr":172.18,"pm_dec_mas_yr":-0.59,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Equuleus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-201876","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"21121+1038","companions":[{"measured":2003,"magnitude":10.08,"components":"AB","discoverer_code":"ENG  81","separation_arcsec":184.7,"position_angle_deg":353}],"spectral_type":"F8","uncertainties":{"metallicity_fe_h":[0.04,0.04]},"color_index_bv":0.56,"luminosity_solar":2.7441004182565716,"metallicity_fe_h":-0.04,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":4.07,"surface_temperature_k":6130,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":172.18,"proper_motion_dec_mas_yr":-0.59,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 201876"},{"catalog":"HIP","designation":"HIP 104672"}],"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."}