SAO Star Catalog - SAO Star Catalog

...The first edition of the AGK1 star catalog was published in 1890-1910 and included 144,000 stars. Later, the latitude band was expanded and the accuracy of proper motion was improved. The third edition, AGK3, was compiled in the 1960s, and eventually 200,000 stars were included in the FK4 catalog. The SAO star catalog (short for Smithsonian Astrophysical Observatory) is a star catalog that was selected from the AGK2 and Cape Observatory latitude band catalogs with the aim of a uniform distribution of stars across the sky to serve as a standard for satellite photographic observations. It includes 259,000 stars, and its positions and proper motions are in accordance with FK4, with an accuracy of ±0.1. It also includes spectral types....

*Some of the terminology referenced in the "SAO Star Catalog" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…初版AGK1星表は1890‐1910年に出版，14.4万の星を記載，のちに緯度帯を拡張し，また固有運動の精度を向上して1960年代には第3版AGK3星表が編纂（へんさん）され，結局20万の星がFK4に準拠して記載された。SAO星表(Smithsonian Astrophysical Observatoryの略)は人工衛星の写真観測の基準とするために，星の全天一様な分布を目標としてAGK2とケープ天文台の緯度帯カタログから星を選んだ星表で，25.9万の星を記載し，位置と固有運動はFK4に準拠し，精度±0.″1を目標とする。またスペクトル型も記載してある。…

※「SAO 星表」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報