{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T00:43:45.735Z","years_from_j2000":26.682,"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-183811","name":"HD 183811","class":"g8_k1_v_yellow_main_sequence_star","category":"star","object_type":"G8/K1(V) yellow main-sequence star","mag":9.17,"mag_band":"V","abs_mag":4.954,"abs_mag_band":"V","distance_ly":227.2866380012007,"distance_method":"parallax","ra_deg":294.22746,"dec_deg":-69.816828,"epoch_ra_deg":294.944876,"epoch_dec_deg":-69.756969,"epoch_moved_arcsec":1.792,"pm_ra_mas_yr":55.11,"pm_dec_mas_yr":-38.36,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pavo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-183811","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19369-6949","companions":[{"measured":2016,"magnitude":12.22,"components":"AB","discoverer_code":"FIN 272","separation_arcsec":5.7,"position_angle_deg":37},{"measured":2015,"magnitude":15.16,"components":"AC","discoverer_code":"BAU  58","separation_arcsec":46.7,"position_angle_deg":343},{"measured":2015,"magnitude":12.25,"components":"AD","discoverer_code":"BAU  58","separation_arcsec":53.8,"position_angle_deg":326}],"spectral_type":"G8/K1(V)","color_index_bv":0.9,"luminosity_solar":0.9086570489581459,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1975MSS...C01....0H, quality E)","surface_temperature_k":5403,"proper_motion_ra_mas_yr":55.11,"proper_motion_dec_mas_yr":-38.36,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 183811"},{"catalog":"HIP","designation":"HIP 96487"}],"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."}