{"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":"2026-09-07T02:24:35.390Z","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-179736","name":"HD 179736","class":"f5_yellow_white_star","category":"star","object_type":"F5 yellow-white star","mag":8.11,"mag_band":"V","abs_mag":3.809,"abs_mag_band":"V","distance_ly":236.34530523590553,"distance_method":"parallax","ra_deg":288.17685,"dec_deg":24.576769,"epoch_ra_deg":288.456305,"epoch_dec_deg":24.621553,"epoch_moved_arcsec":1.827,"pm_ra_mas_yr":68.25,"pm_dec_mas_yr":-5.55,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Vulpecula","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-179736","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19127+2435","companions":[{"measured":2018,"magnitude":9.64,"components":"Aa,Ab","discoverer_code":"HDS2720","separation_arcsec":0.2,"position_angle_deg":85},{"measured":2015,"magnitude":null,"components":"AF","discoverer_code":"A   264","separation_arcsec":0.5,"position_angle_deg":10},{"measured":2015,"magnitude":null,"components":"AG","discoverer_code":"A   264","separation_arcsec":0.6,"position_angle_deg":123},{"measured":2016,"magnitude":11.9,"components":"AB","discoverer_code":"A   264","separation_arcsec":3.6,"position_angle_deg":286},{"measured":2016,"magnitude":12.8,"components":"AC","discoverer_code":"MAD   7","separation_arcsec":3.6,"position_angle_deg":290},{"measured":2016,"magnitude":11.9,"components":"AH","discoverer_code":"A   264","separation_arcsec":3.6,"position_angle_deg":255},{"measured":2015,"magnitude":15,"components":"AD","discoverer_code":"A   264","separation_arcsec":26.3,"position_angle_deg":116}],"spectral_type":"F5","color_index_bv":0.53,"luminosity_solar":2.6085550118689036,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_temperature_k":6059,"proper_motion_ra_mas_yr":68.25,"proper_motion_dec_mas_yr":-5.55,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 179736"},{"catalog":"HIP","designation":"HIP 94387"}],"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."}