Re: Data Trend

[hjohnson@pluto.njcc.com (Herbert R Johnson)]

On Mon, 23 Oct 2000 16:33:15 -0500, Tom Droege <tdroege@veriomail.com> wrote:
*>As I send out disk 16, I realize that I have sent a lot of data out into 
*>the world.  Some of you must have quite a collection.  I don't think there 
*>have been 16 disks sent out as I skipped some numbers, but there have been 
*>quite a few.
*>
*>It would be interesting for someone to make a comparison between the disks 
*>an plot something like quality of the data vs time.  Is progress really 
*>being made?

Certainly the quality of imaging has improved, that is important. Improved
cooling has probably reduced hot pixels and dark current. I have an
unpublished proto-Tech NOte on CCD behavior from previous Mark IV
images. Since Tom will send me a disk 16 data set, I can update and complete
this TN accordingly. Tom, if you offer some parameters you'd like to have
reviewed, I'll consider trying to do so. My Note covers disk #5 (SEpt 1999,
from Arne camera H3 and H4), and discusses dark image values and variations;
covered pixels; bright corners; and hot pixels vs. CCD temperature. Maybe
I'll "publish" what I have and Tom can offer new data and I'll update it again.

Herb Johnson


Herb Johnson
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