{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T13:27:16.666Z","years_from_j2000":26.67,"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-177758","name":"HD 177758","class":"g2vfe_1_0ch_0_6_yellow_main_sequence_star","category":"star","object_type":"G2VFe-1.0CH-0.6 yellow main-sequence star","mag":7.25,"mag_band":"V","abs_mag":4.348,"abs_mag_band":"V","distance_ly":124.10837253601977,"distance_method":"parallax","ra_deg":286.60551,"dec_deg":-11.897405,"epoch_ra_deg":286.978352,"epoch_dec_deg":-11.859512,"epoch_moved_arcsec":12.162,"pm_ra_mas_yr":-186.88,"pm_dec_mas_yr":-415.96,"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-177758","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19064-1154","age_years":7319876700,"companions":[{"measured":2025,"magnitude":12.2,"components":"AB","discoverer_code":"RST4028","separation_arcsec":1.3,"position_angle_deg":341}],"mass_solar":1.034,"radius_solar":1.222,"spectral_type":"G2VFe-1.0CH-0.6","uncertainties":{"metallicity_fe_h":[0.164,0.164]},"color_index_bv":0.57,"luminosity_solar":1.587815364205615,"metallicity_fe_h":-0.605,"radial_velocity_km_s":0.2,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","surface_gravity_log_g":4.259,"surface_temperature_k":5863,"metallicity_fe_h_source":"Median of 6 spectroscopic determinations in 6 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-186.88,"proper_motion_dec_mas_yr":-415.96,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":1.5896},"designations":[{"catalog":"HD","designation":"HD 177758"},{"catalog":"HIP","designation":"HIP 93827"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}