411 REFERENCE · Wikibooks
Messier Index/M55
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Messier 55 280px w:J2000 XI Sagittarius 19 39 59.40SIMBAD Astronomical Database
Results for NGC 6809
http://simbad.u-strasbg.fr/Simbad
2006-11-16 -30 57 43.5 17.3 klyFebruary 2007 5.3 kpc +7.42 19′.0 48 lydistance × sin( diameter_angle / 2 ) = 48 ly. radius M55, NGC 6809, GCl 113
Messier 55 (also known as M55 or NGC 6809) is a w:globular cluster in the w:constellation Sagittarius. It was discovered by w:Nicolas Louis de Lacaille in w:1751 and catalogued by w:Charles Messier in w:1778. M55 is at a distance of about 17,300 w:light-years away from w:Earth. Only about half a dozen w:variable stars have been discovered in M55.
External links
Messier 55
Messier 55, SEDS Messier pages
Messier 55, Galactic Globular Clusters Database page
References