NGC6997

Observing Log
Date of observation: September 13, 2001
Time at end of first CCD image 9:17 PDT
Time at end of last CCD image 9:58 PDT
Observing location: home observatory
Fastar CCD Imaging session

Sky Conditions
Seeing: FWHM 2.40981
Transparency: magnitude 14.0 star is a peak value 464.333 with a background of 185.481.
Seeing and transparency is based on Star GSC 3179:1178, RA: 20h 57m 28.0s Dec: +44°45'47" (Epoch 2000).
Star is at column 178.401 and row 140.099 in the image.
For Sun set, astronomical twilight end, Moon rise or set, astronomical twilight begin and Sun rise refer to dark sky.

Observation Notes
NGC6997 is an open cluster.
Location in image: center
LocationRA: 20h 56m 30.0s Dec: +44°38'00" (Epoch 2000)

Image size is 41 arc minutes wide by 31 arc minutes high with an image resolution of 3.8 arc sec per pixel.
Image orientation: north is the top, west is the right, east is the left and south is the bottom.

Additional Information on NGC Objects
SEDS Interactive NGC Catalog Online
NGC/IC Project

Observing Equipment

Celestron C-8 Schmidt-Cassegrain telescope with Fastar lens accessory and SBIG ST-237 CCD Camera (8" optical tube, focal length 406mm at f/1.95)
CCD image time: 51 X 30 seconds images stacked together.

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

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