NGC 6522 explained

NGC 6522
Epoch:	J2000
Constellation:	Sagittarius
Ra:	^[1]
Dist Ly:	25.1abbr=onNaNabbr=on
Appmag V:	8.3^[2]
Size V:	16.4'
Metal Fe:	–1.34
Age:	12.0 Gyr

NGC 6522 is a globular cluster in the constellation Sagittarius. It is apparent magnitude 8.3, and diameter 16.4 arc minutes, and class VI with stars 16th magnitude and dimmer. It was discovered by William Herschel on June 24, 1784. It is centered in a region of the sky known as Baade's Window.

NGC 6522 is possibly the oldest star cluster in the Milky Way,^[3] with an age of more than 12 billion years.^[4]

External links

• • NGC6522, Galactic Globular Clusters Database page

Notes and References

1. Web site: SIMBAD Astronomical Database . Results for NGC 6522 . 2011-03-13.
2. Web site: NGC 6522 . 2020-09-23.
3. https://arxiv.org/abs/0908.3603 "VLT-FLAMES Analysis of 8 giants in the Bulge Metal-poor Globular Cluster NGC 6522: Oldest Cluster in the Galaxy?"
4. https://www.newscientist.com/article/dn20426-the-universes-first-stars-were-whirling-dervishes.html "The universe's first stars were whirling dervishes"