{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T06:50:49.744Z","years_from_j2000":26.685,"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-178911","name":"HD 178911","class":"g1v_k1v_yellow_main_sequence_star","category":"star","object_type":"G1V+K1V yellow main-sequence star","mag":6.7,"mag_band":"V","abs_mag":3.106,"abs_mag_band":"V","distance_ly":170.6730662698838,"distance_method":"parallax","ra_deg":287.26824000000005,"dec_deg":34.600451,"epoch_ra_deg":287.513909,"epoch_dec_deg":34.6444,"epoch_moved_arcsec":5.341,"pm_ra_mas_yr":47.12,"pm_dec_mas_yr":194.51,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Lyra","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-178911","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19091+3436","companions":[{"measured":2014,"magnitude":8.96,"components":"Aa,Ab","discoverer_code":"CHR  84","separation_arcsec":0.1,"position_angle_deg":114},{"measured":2019,"magnitude":7.88,"components":"AB","discoverer_code":"STF2474","separation_arcsec":16,"position_angle_deg":262},{"measured":2017,"magnitude":11.42,"components":"AC","discoverer_code":"WAL 105","separation_arcsec":97.5,"position_angle_deg":126}],"spectral_type":"G1V+K1V","uncertainties":{"metallicity_fe_h":[0.137,0.137]},"color_index_bv":0.643,"luminosity_solar":4.984252094042598,"metallicity_fe_h":0.06,"variable_mag_max":6.625,"variable_mag_min":6.825,"radial_velocity_km_s":-41,"spectral_type_source":"SIMBAD (2014AJ....148...48F, quality C)","surface_gravity_log_g":4.26,"surface_temperature_k":5845,"metallicity_fe_h_source":"Median of 7 spectroscopic determinations in 8 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":47.12,"proper_motion_dec_mas_yr":194.51,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 178911"},{"catalog":"HIP","designation":"HIP 94076"},{"catalog":"HR","designation":"HR 7272"}],"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."}