{"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":"2026-09-02T18:57:15.259Z","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-173607","name":"5 ε² Lyr","class":"a6vn_a7vn_white_main_sequence_star","category":"star","object_type":"A6Vn+A7Vn white main-sequence star","mag":4.59,"mag_band":"V","abs_mag":1.198,"abs_mag_band":"V","distance_ly":155.53484415453886,"distance_method":"parallax","ra_deg":281.094915,"dec_deg":39.612721,"epoch_ra_deg":281.317206,"epoch_dec_deg":39.639896,"epoch_moved_arcsec":1.391,"pm_ra_mas_yr":5.83,"pm_dec_mas_yr":51.83,"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-173607","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"18443+3940","age_years":827542660,"companions":[{"measured":2005,"magnitude":null,"components":"Ca,Cb","discoverer_code":"CHR  77","separation_arcsec":0.1,"position_angle_deg":225},{"measured":2025,"magnitude":5.38,"components":"CD","discoverer_code":"STF2383","separation_arcsec":2.4,"position_angle_deg":72},{"measured":2023,"magnitude":12.3,"components":"CE","discoverer_code":"STF2383","separation_arcsec":61.8,"position_angle_deg":332},{"measured":2023,"magnitude":14.2,"components":"CD,G","discoverer_code":"SHJ 277","separation_arcsec":74.7,"position_angle_deg":290},{"measured":2023,"magnitude":12.7,"components":"CD,F","discoverer_code":"SHJ 277","separation_arcsec":91.5,"position_angle_deg":359},{"measured":2023,"magnitude":13.9,"components":"CD,H","discoverer_code":"SHJ 277","separation_arcsec":94.9,"position_angle_deg":311},{"measured":2023,"magnitude":10.12,"components":"CI","discoverer_code":"STFA 37","separation_arcsec":120.3,"position_angle_deg":36},{"measured":2000,"magnitude":10.12,"components":"DI","discoverer_code":"STFA 37","separation_arcsec":121.6,"position_angle_deg":37}],"mass_solar":1.84,"radius_solar":2.081,"spectral_type":"A6Vn+A7Vn","color_index_bv":0.18,"luminosity_solar":28.89348981559081,"radial_velocity_km_s":-24,"spectral_type_source":"SIMBAD (1995ApJS...99..135A, quality C)","surface_gravity_log_g":3.97,"surface_temperature_k":7967,"proper_motion_ra_mas_yr":5.83,"proper_motion_dec_mas_yr":51.83,"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":15.1707},"designations":[{"catalog":"Bayer/Flamsteed","designation":"5 Epsilon2 Lyr"},{"catalog":"HD","designation":"HD 173607"},{"catalog":"HIP","designation":"HIP 91926"},{"catalog":"HR","designation":"HR 7053"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T18:38:07.546Z","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."}