[Aavso-photometry] FITS test results so far

[Chuck Pullen]

I too just do the photometry then bin it when I need to beat down the 
noise.  This is easy to do, gives a very useful true measure of the 
variation of the measurement in the SD of the mean, and allows me to be 
absolutely sure the mid time of exposure is correct.  If there is an actual 
reason to stack the images, other than for color work or to make a finder 
chart or  graphic for publication, I'd be interested in hearing it as well.

Of course, there are more pressing matters on my agenda:   What am I going 
to wear to Charles' and Camilla's Wedding?  I've already gotten my 
invitation, but have nothing suitable!

Chuck Pullen

At 11:26 2/10/05 -0600, Michael Koppelman wrote:

>It is certainly enlightening to see how these different software packages 
>handle this. Clearly in most cases if images are combined the TIME-OBS 
>keyword needs to be managed manually.
>
>I almost never combine images and then do photometry. I always do 
>photometry and then average the photometry if I find I need to beat the 
>errors down. This allows me to do a weighted average if the uncertainties 
>are not equal. It also takes out the extra math involved with registering 
>and rotating images if there is some slight change in the field over time. 
>It's hard for me to think of a reason why one would stack images before 
>doing photometry. Can anyone help me?
>
>Cheers,
>Michael Koppelman
>http://www.lolife.com/astronomy/
>
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>




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