Messier M17


Object Information
Messier object: M17
Common name for Messier object: Omega, Swan, Horeshoe, or Lobster Nebula
NGC (New General Catalog) number: NGC 6618
Discription: Diffuse Nebula
Located in constellation: Sagittarius Sagittarius
Right ascension in hours minutes: 18:20.8
Declination in degrees minutes: -16:11
Visual magnitude: 7, 7.5
Size: 11.0' arc minutes
Image size: 55.23 arc minutes high by 40.98 arc minutes wide
Image orientation: North is top, East is left
M17 information in SEDS Messier database
Other Messier galleries, images or catalogs

Observing Log
Date September 13, 1998
Time at end of first CCD image 21:55 PDT
Time at end of last CCD image 22:07 PDT
Observing Location: At home on the drive way
Observation of object:
M17 is an large bright irregular shape diffuse nebula with dark patches and rifts. The bright part of the nebula looks like a swan in the water.
Sky Conditions
CCD image time: Four 240 seconds images added together
Sky transparency: 5.0 (Magnitude of the faintest star visible with the unaided eye in Ursa Minor)
Moon rise at 00:45 PDT on September 14, 1998
Astronomical twilight ends in the evening at 21:06 PDT on September 13, 1998
Astronomical twilight starts in morning at 5:03 PDT on September 14, 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: 20 - 240 seconds dark frames
Notes: Used too cold of cooling water for the CB245 camera and the CB245 camera dewed up with water all over it. There may be some water on the camera window on some of the images taken night of September 13, 1998.

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