{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T20:43:52.441Z","years_from_j2000":26.681,"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-161198","name":"HD 161198","class":"g9v_yellow_main_sequence_star","category":"star","object_type":"G9V yellow main-sequence star","mag":7.51,"mag_band":"V","abs_mag":5.735,"abs_mag_band":"V","distance_ly":73.8747457092201,"distance_method":"parallax","ra_deg":265.81521,"dec_deg":21.609209,"epoch_ra_deg":266.099453,"epoch_dec_deg":21.59178,"epoch_moved_arcsec":16.861,"pm_ra_mas_yr":-123.15,"pm_dec_mas_yr":-619.84,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Hercules","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-161198","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"17433+2137","companions":[{"measured":2025,"magnitude":null,"components":"Aa,Ab","discoverer_code":"DUQ   1","separation_arcsec":0.3,"position_angle_deg":84},{"measured":2016,"magnitude":15,"components":"AB","discoverer_code":"ALP  31","separation_arcsec":23,"position_angle_deg":189}],"spectral_type":"G9V","uncertainties":{"metallicity_fe_h":[0.084,0.084]},"color_index_bv":0.752,"luminosity_solar":0.4425883723626262,"metallicity_fe_h":-0.42,"radial_velocity_km_s":24.4,"spectral_type_source":"SIMBAD (2003AJ....126.2048G, quality C)","surface_gravity_log_g":4.52,"surface_temperature_k":5280,"metallicity_fe_h_source":"Median of 3 spectroscopic determinations in 7 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-123.15,"proper_motion_dec_mas_yr":-619.84,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Gliese","designation":"Gl 692.1"},{"catalog":"HD","designation":"HD 161198"},{"catalog":"HIP","designation":"HIP 86722"}],"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."}