From: Phil Houston <pkh111@knology.net>

Date: April 13, 2008 6:54:42 PM MDT

To: astro_IIDC@yahoogroups.com

Subject: Lines of Saturn

Milton,

Do you have any idea what could produce the diagonal lines in the image of Saturn? (link below)  I have noticed this effect every so often in the past but last night, when seeing was good, most of the longer video captures (2000 frames) produced this effect when stacked and processed.  I have not changed my processing techniques and some images do not have the lines.  I've exaggerated the sharpening to show the lines more clearly in the linked image and the capture settings are listed below.

=================== File:20080412_231531_L.mov #frames 1936

Monochrome Camera = Model:'DMx 31AF03' Serial Number:

Camera Display Format: 1024x768 8bit

CCD Image Left: 0

CCD Image Top: 0

CCD Image Width: 1024

CCD Image: Height 768

Gamma: 1.17

Brightness: 951

Black Point: 0

Exposure: 66.67 ms

Sharpness Limiting On: 0

Dark Frame Subtraction On: 0

Flat Frame Correction On: 0

Invert Image On: 0

Flip Horizontal On: 0

Flip Vertical On: 0

Histogram Expand On: 0

Binning Off Monochrome

http://www.knology.net/~pkh111/saturn%20lines.jpg

I am at a loss as to the cause of this noise and would appreciate any ideas.

Thanks,

Phil