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CCD Image Notes - Session 110
(2006-01-03)

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Notes from CCD Session S00110.
 
Bullet Sky Condition Graph
Bullet Impact of light wind on image quality with & without dew shield
 
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Goto Images from 2006-01-11


Sky Condition Graph

Sky Conditions Chart (S110)
Image
 
Image
Image

Notice 
1)  

 

See explanation of these graphs

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Impact of light wind on image quality with & without dew shield

A dew shield was installed on the scope at the commencement of the session as a precaution against dew formation, but more specifically to reduce potential glare from a 94% phase moon which was high in the southern sky.   Dew did not in fact cause any problem this particular evening and the benefits in reducing moon glare were completed overwhelmed by the detrimental effect on image quality caused by  additional wind vibration on the scope.  The dramatic difference in image quality immediately before and after removing the dew shield are shown by the two images below.

With Dew Shield
(wind catches dew shield and causes vibration of 
scope and consequential poor image quality) 
Dew Shield Removed 
(image quality immediately improved 
after taking off dew shield) 
Image  Image
CCD Image
2 min exposure,  C Filter
2006-01-11  22:05h UT (#110067)
CCD Image
2 min exposure,  C Filter
2006-01-11  22:09h UT (#110070)

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This Web Page: CCD Image Notes - (2006-01-11)
Last Updated : 2015-05-16
Site Owner : David Richards
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