Messier M55


Object Information
Messier object: M55
NGC (New General Catalog) number: NGC 6809
Discription: Globular Cluster
Located in constellation: Sagittarius
Right ascension in hours:minutes: 19:40.0
Declination in degrees:minutes: -30:58
Visual magnitude: 6.3
Size: 19.0 arc minutes
Image size: 55.23 arc minutes high by 40.98 arc minutes wide
Image orientation: North is top, East is left
Detailed discription of M55 in SEDS Messier database
Other Messier galleries, images or catalogs

Observing Log
Date September 26, 1998
Time at end of first CCD image 09:29 PDT
Time at end of last CCD image 09:42 PDT
Observing Location: At home on the drive way
Observation of object: M55 is a irregular round globular cluster with some stars resolved towards the center and it has a bright irregular core.
Sky Conditions
Sky transparency: 5.0 (Magnitude of the faintest star visible with the unaided eye in Ursa Minor)
Moon sets at 22:28 PDT on September 26, 1998
Astronomical twilight ends in the evening at 20:38 PDT on September 26, 1998
Astronomical twilight starts in morning at 5:20 PDT on September 27, 1998
Observing Equipment
80 mm aperture refractor telescope and CCD Cookbook Camera
CCD image time: 4 - 240 seconds images added together
CCD dark calibration frames: 23 - 240 seconds dark frames

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