{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T12:09:23.049Z","years_from_j2000":26.686,"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-177517","name":"HD 177517","class":"b8iii_psi_blue_white_giant","category":"star","object_type":"B8III(pSi) blue-white giant","mag":5.93,"mag_band":"V","abs_mag":-0.775,"abs_mag_band":"V","distance_ly":715.2550655180195,"distance_method":"parallax","ra_deg":286.42158,"dec_deg":-15.660419,"epoch_ra_deg":286.806199,"epoch_dec_deg":-15.61994,"epoch_moved_arcsec":0.277,"pm_ra_mas_yr":0.74,"pm_dec_mas_yr":-10.36,"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-177517","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19057-1540","age_years":228942600,"companions":[{"measured":2000,"magnitude":13.3,"components":"AC","discoverer_code":"BU 9016","separation_arcsec":45.5,"position_angle_deg":95},{"measured":2020,"magnitude":12.1,"components":"AB","discoverer_code":"HJ 5507","separation_arcsec":46,"position_angle_deg":63}],"mass_solar":3.567,"radius_solar":8.45,"spectral_type":"B8III(pSi)","color_index_bv":-0.015,"luminosity_solar":177.82794100389228,"radial_velocity_km_s":-26,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality C)","surface_gravity_log_g":2.931,"surface_temperature_k":8000,"proper_motion_ra_mas_yr":0.74,"proper_motion_dec_mas_yr":-10.36,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: above 7,500 K GSP-Phot's temperature and extinction are degenerate","bolometric_luminosity_solar":307.3182},"designations":[{"catalog":"HD","designation":"HD 177517"},{"catalog":"HIP","designation":"HIP 93763"},{"catalog":"HR","designation":"HR 7230"}],"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."}