The Bayer designation Chi Sagittarii (χ Sagittarii) is shared by three star systems in the zodiac constellationofSagittarius. The brightest of these, χ1 Sagittarii and χ3 Sagittarii, are separated by 0.56° on the sky. The dimmer star χ2 Sagittarii is located between them, 0.10° from χ1, and is too faint to be seen with the naked eye. In 1977, the Wow! signal came from the direction of these stars.
These three χ star, together with φ Sgr, σ Sgr, ζ Sgr and τ Sgr were Al Naʽām al Ṣādirah (النعم السادرة), the Returning Ostriches.[1] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Naʽām al ṢādirahorNamalsadirah was originally the title for four stars: φ Sgr as Namalsadirah I, τ SgrasNamalsadirah II, χ1 Sgr as Namalsadirah III and χ2 Sgr as Namalsadirah IV (except σ Sgr and ζ Sgr).[2]InChinese, 狗 (Gǒu), meaning Dog, refers to an asterism consisting of χ1 Sagittarii and 52 Sagittarii. Consequently, χ1 Sagittarii itself is known as 狗二 (Gǒu èr, English: the Second Star of Dog.)[3]
