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| Catalogue and alternative designations | M
55, NGC 6809
|
| Type | Globular Cluster |
| Position | 19 40 00, -30 57 53 |
| Constellation | Sagittarius |
| Camera and Telescope | STXL6303 and 36.8cm RCOS Ritchey Chretien |
| Focal Ratio | F9 |
| Exposure Details | A
LRGB shot with L=R=B=50 minutes.
A synthetic green channel was
created by combining the red and
blue. All exposures used
Astrodon filters and were
unbinned.
|
| Description | M 55 is one of the many globular clusters in Sagittarius but perhaps less well known than some of the others. The apparent magnitude is 6.3 and the dimensions are 19 arcminutes. The distance is 17,600 light years. M 55 is one of the less condensed globulars having a concentration class of 11. It is thus easily resolved into stars with relatively small telescopes. |