{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T13:49:31.481Z","years_from_j2000":26.672,"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-201836","name":"HD 201836","class":"b6iv_blue_white_subgiant","category":"star","object_type":"B6IV blue-white subgiant","mag":6.46,"mag_band":"V","abs_mag":-1.675,"abs_mag_band":"V","distance_ly":1382.0185054226242,"distance_method":"parallax","ra_deg":317.62899,"dec_deg":47.692224,"epoch_ra_deg":317.860473,"epoch_dec_deg":47.801301,"epoch_moved_arcsec":0.146,"pm_ra_mas_yr":-4.08,"pm_dec_mas_yr":-3.66,"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-201836","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"21105+4742","companions":[{"measured":2018,"magnitude":9.07,"components":"AB","discoverer_code":"BU  159","separation_arcsec":1.2,"position_angle_deg":314},{"measured":2015,"magnitude":13.5,"components":"AD","discoverer_code":"BU  159","separation_arcsec":14.8,"position_angle_deg":145},{"measured":2015,"magnitude":13.5,"components":"AE","discoverer_code":"LV   23","separation_arcsec":46.8,"position_angle_deg":338},{"measured":2012,"magnitude":7.52,"components":"AC","discoverer_code":"STTA215","separation_arcsec":136.7,"position_angle_deg":189}],"spectral_type":"B6IV","color_index_bv":0.007,"luminosity_solar":407.3802778041126,"radial_velocity_km_s":-9,"spectral_type_source":"SIMBAD (quality C)","surface_temperature_k":12735,"proper_motion_ra_mas_yr":-4.08,"proper_motion_dec_mas_yr":-3.66,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 201836"},{"catalog":"HIP","designation":"HIP 104537"},{"catalog":"HR","designation":"HR 8107"}],"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."}