{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T20:57:43.389Z","years_from_j2000":26.684,"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-179757","name":"HD 179757","class":"f0v_yellow_white_main_sequence_star","category":"star","object_type":"F0V yellow-white main-sequence star","mag":8.69,"mag_band":"V","abs_mag":2.34,"abs_mag_band":"V","distance_ly":607.3674281149864,"distance_method":"parallax","ra_deg":288.25917,"dec_deg":19.138989,"epoch_ra_deg":288.553851,"epoch_dec_deg":19.184016,"epoch_moved_arcsec":0.09,"pm_ra_mas_yr":-2.27,"pm_dec_mas_yr":-2.49,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sagitta","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-179757","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19130+1908","age_years":916724700,"companions":[{"measured":2016,"magnitude":10.2,"components":null,"discoverer_code":"STF2482","separation_arcsec":1.8,"position_angle_deg":341}],"mass_solar":1.598,"radius_solar":1.686,"spectral_type":"F0V","color_index_bv":0.331,"luminosity_solar":10.092528860766844,"radial_velocity_km_s":21,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":4.097,"surface_temperature_k":7458,"proper_motion_ra_mas_yr":-2.27,"proper_motion_dec_mas_yr":-2.49,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":7.9025},"designations":[{"catalog":"HD","designation":"HD 179757"},{"catalog":"HIP","designation":"HIP 94418"}],"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."}