{"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":"2026-09-07T00:01:44.432Z","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-181199","name":"HD 181199 A","class":"g0_5v_yellow_main_sequence_star","category":"star","object_type":"G0.5V yellow main-sequence star","mag":8.17,"mag_band":"V","abs_mag":4.805,"abs_mag_band":"V","distance_ly":153.63009090867308,"distance_method":"parallax","ra_deg":290.22321,"dec_deg":-33.052953,"epoch_ra_deg":290.659163,"epoch_dec_deg":-33.003981,"epoch_moved_arcsec":4.013,"pm_ra_mas_yr":9.42,"pm_dec_mas_yr":-150.12,"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-181199","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19209-3303","companions":[{"measured":2024,"magnitude":11.8,"components":"Aa,Ab","discoverer_code":"TOK 433","separation_arcsec":0.1,"position_angle_deg":111},{"measured":2020,"magnitude":10.26,"components":"AB","discoverer_code":"HJ 5107","separation_arcsec":13.8,"position_angle_deg":125}],"spectral_type":"G0.5V","uncertainties":{"metallicity_fe_h":[0.05,0.05]},"color_index_bv":0.656,"luminosity_solar":1.042317429393304,"metallicity_fe_h":-0.17,"variable_mag_max":8.096,"variable_mag_min":8.276,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","surface_gravity_log_g":4.44,"surface_temperature_k":5780,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":9.42,"proper_motion_dec_mas_yr":-150.12,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 181199"},{"catalog":"HIP","designation":"HIP 95106"}],"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."}