Messier M23


Object Information
Messier object: M23
NGC (New General Catalog) number: NGC 6494
Discription: Open Cluster
Located in constellation: Sagittarius
Right ascension in hours minutes: 17:56.8
Declination in degrees minutes: -19:01
Visual magnitude: 6.9
Size: 27.0 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 M23 in SEDS Messier database
Other Messier galleries, images or catalogs

Observing Log
Date of observation:
Time at end of first CCD image PDT
Time at end of last CCD image PDT
Observing Location: At home on the drive way
Observation of object:
Sky Conditions
Sky transparency: (Magnitude of the faintest star visible with the unaided eye in Ursa Minor)
Moon rise/set at PDT on
Astronomical twilight ends in the evening at PDT on
Astronomical twilight starts in morning at PDT on
Observing Equipment
80 mm aperture refractor telescope and CCD Cookbook Camera
CCD image time: - seconds images added together
CCD dark calibration frames: - seconds dark frames

Use Test patterns to calibrate monitor brightness, contrast, height and width