{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T04:16:58.659Z","years_from_j2000":26.669,"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-199766","name":"1 ε Equ","class":"f5_v_f6_v_yellow_white_main_sequence_star","category":"star","object_type":"F5(V)+F6(V) yellow-white main-sequence star","mag":5.3,"mag_band":"V","abs_mag":1.635,"abs_mag_band":"V","distance_ly":176.3961322296795,"distance_method":"parallax","ra_deg":314.768655,"dec_deg":4.293481,"epoch_ra_deg":315.103651,"epoch_dec_deg":4.396305,"epoch_moved_arcsec":5.021,"pm_ra_mas_yr":-113.43,"pm_dec_mas_yr":-150.28,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Equuleus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-199766","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20591+0418","companions":[{"measured":2025,"magnitude":6.31,"components":"AB","discoverer_code":"STF2737","separation_arcsec":0.2,"position_angle_deg":106},{"measured":2023,"magnitude":7.05,"components":"AB,C","discoverer_code":"STF2737","separation_arcsec":10.6,"position_angle_deg":67},{"measured":2013,"magnitude":13.1,"components":"AD","discoverer_code":"STF2737","separation_arcsec":69.3,"position_angle_deg":293}],"spectral_type":"F5(V)+F6(V)","color_index_bv":0.464,"luminosity_solar":19.31968317016924,"radial_velocity_km_s":18,"spectral_type_source":"SIMBAD (1980ApJS...44..489B, quality D)","proper_motion_ra_mas_yr":-113.43,"proper_motion_dec_mas_yr":-150.28},"designations":[{"catalog":"Bayer/Flamsteed","designation":"1 Epsilon Equ"},{"catalog":"HD","designation":"HD 199766"},{"catalog":"HIP","designation":"HIP 103569"},{"catalog":"HR","designation":"HR 8034"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}