Re: Yet another good data night

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

On Thu, 25 Mar 1999 07:09:03 -0600, Tom Droege <droege@wwa.com> wrote:
*>Another 2 CD ROMs worth of data last night to add to my stack.  About 12 so
*>far.  I am beginning to see a problem.  My guess is that we will have a 5
*>mag range between noise and saturation.  If I am correct (from star counts)
*>that we can measure mag 15, then we saturate at 10.   This means that we
*>will need a catalog of mag 11 or so stars for calibration.  Is this available?

*>Tom Droege
*>
*>

Lets see...magnitude ratios are 2.5 log (a/b), so 5 mags is about a 100:1
energy ratio. Is signifigant noise at 1% of saturation? or is my arithmetic
incorrect? or are your mag estimates off? But I note that Arne's note suggest
that 4-5 mags for a CCD is par, so maybe this range is OK.

Herb Johnson

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