Factoids:
M55 is a globular cluster with a large apparent size--about 2/3 the apparent diameter of the moon. It is about 17,300 light years away and 100 light years in diameter. Its highly southern declination means it can be hard for Northern Hemisphere observers to see. It was originally discovered by Lacaille in 1751-52 when he was observing in South Africa. Charles Messier tried in vain to spot it as early as 1764, but wasn't able to find and catalog it until 1778.
| Subject | M55/NGC 6809 |
| Classification | Globular Cluster |
| Position | Sagittarius [RA: 19:40.0 / Dec: -30:58]* |
| Size* | 19.0' |
| Brightness* | 6.3 |
| Date/Time | 10/14/04 - 8:05 PM |
| Observing Loc. | Flagstaff, AZ - Home |
| Instrument | Orion SVP 6LT Reflector (150 mm dia./1200 mm F/L) |
| Eyepieces/Mag. | 25 mm (48X), 10 mm (120X) |
| Seeing | 3/10 |
| Transparency | Mag 5.8 |
* Based on published data.
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