Ny Sagittarii

The two ν stars are located above σ , near the ecliptic (red dashed line).

The Bayer designation Ny Sagittarii ( Ny Sgr , ν Sagittarii , ν Sgr ) refers to two star systems ν ¹ Sagittarii and ν ² Sagittarii in the ecliptic - constellation Sagittarius . Their angular distance is 0.23 °.

• ν ¹ Sagittarii (distance approx. 1100 light years )
• ν ² Sagittarii (distance approx. 270 light years)

Ny Sagittarii traditionally bears the name Ain al Rami , which is derived from the Arabic عين الرامي ^c ain ar-rāmī and means eye of the archer . Both ν-stars together with τ Sgr , ψ Sgr , ω Sgr , 60 Sgr and ζ Sgr are called Al Udḥiyy , ostrich nest . Ptolemy already described the star as nebulous and double: Quae in oculo est nebulosa et bina . Ny Sagittarii is therefore often cited as the earliest described double star , although it is only an optical double star .

Individual evidence

1. ^ RH Allen: Star Names: Their Lore and Meaning (Reprint ed.) . New York: Dover Publications Inc. (1963), page 355. ISBN 0-486-21079-0 .
2. ^ Robert Prokop: Observing the Nearest Stars , Lulu.com (2012), ISBN 978-1-10583-452-3 , page 45
3. ↑ The star catalog in the Almagest ( Memento from November 15, 2007 in the Internet Archive )
4. ↑ Tammy Plotner, Ken Vogt: The Night Sky Companion: A Yearly Guide to Sky-Watching 2009, The Patrick Moore Practical Astronomy Series, Springer Science & Business Media, page 266, ISBN 038779509X .
5. ^ David H. Levy: David Levy's Guide to the Night Sky , Cambridge University Press, ISBN 0-521-79753-5 , Chapter 16.2: Historical Notes