NGC7331

Observing Log
Date of observation: August 24-25, 2001
Time at end of first CCD image 11:25 PDT
Time at end of last CCD image 12:07 PDT
Observing location: home observatory

Sky Conditions
Seeing: FWHM 2.40183 based on Star GSC 2743:2236, Magnitude: 14.0, RA: 22h 37m 17.6s Dec: +34°30'14" (Epoch 2000) Star is at column 267.653, row 159.353, FWHM 2.40183, peak value 548.649, background 2.27095.
For Sun set, astronomical twilight end, Moon rise or set, astronomical twilight begin and Sun rise refer to dark sky.

Observation of Object
NGC7331 is a bright sprial galaxy, magnitude 10.33.
Other galxies to the east of NGC7331 in the image are
NGC7340 magnitude 14.68
NGC7337 magnitude 15.24
NGC7335 magnitude 14.53
Also, three other faint galaxies are in the image.
Image size is 31 arc minutes high by 41 arc minutes wide.
Image orientation: North is top, West is right, East is left and South is bottom.

Observing Equipment

Celestron C-8 Schmidt-Cassegrain telescope with Fastar lens accessory and SBIG ST-237 CCD Camera
CCD image time: 61 - 30 seconds images stacked together
No guiding or PEC was used.

NGC7331 image taken with Orion ShortTube 80 mm refractor telescope and Cookbook CB245 CCD Camera.

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

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