{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-03T00:04:40.353Z","years_from_j2000":26.671,"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-186155","name":"HD 186155","class":"f5ii_iii_yellow_white_bright_giant","category":"star","object_type":"F5II-III yellow-white bright giant","mag":5.06,"mag_band":"V","abs_mag":1.581,"abs_mag_band":"V","distance_ly":161.86423482050998,"distance_method":"parallax","ra_deg":295.20901499999997,"dec_deg":45.524942,"epoch_ra_deg":295.415149,"epoch_dec_deg":45.587666,"epoch_moved_arcsec":3.916,"pm_ra_mas_yr":84.06,"pm_dec_mas_yr":120.38,"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-186155","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19408+4532","age_years":1325461700,"companions":[{"measured":2015,"magnitude":12.7,"components":null,"discoverer_code":"BUP 195","separation_arcsec":91.3,"position_angle_deg":153}],"mass_solar":1.86,"radius_solar":3.318,"spectral_type":"F5II-III","uncertainties":{"metallicity_fe_h":[0.045,0.045]},"color_index_bv":0.426,"luminosity_solar":20.30486002716804,"metallicity_fe_h":0.335,"radial_velocity_km_s":-20,"spectral_type_source":"SIMBAD (2001AJ....121.2148G, quality C)","surface_gravity_log_g":3.668,"surface_temperature_k":6608,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 4 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":84.06,"proper_motion_dec_mas_yr":120.38,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":18.4858},"designations":[{"catalog":"HD","designation":"HD 186155"},{"catalog":"HIP","designation":"HIP 96825"},{"catalog":"HR","designation":"HR 7495"}],"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."}