NGC1491

Observing Log
Date of observation: November 17-18, 2001
Time at end of first CCD image 11:59 PST
Time at end of last CCD image 12:20 PST
Observing location: home observatory
Fastar CCD Imaging session

Sky Conditions
Seeing: FWHM 2.77922
Transparency: magnitude 14.0 star is a peak value 526.653 with a background of 136.917.
Seeing and transparency is based on Star GSC 3339:1044, RA: 04h 02m 45.0s Dec: +51°21'11" (Epoch 2000).
Star is at column 380.767 and row 214.451 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
NGC1491 is a nebula
Location in image: center
Location RA: 04h 03m 24.0s Dec: +51°19'00" (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: 31 X 30 seconds images stacked together.

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

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