Re: A first look at DS24

[Tom Droege <tdroege2@earthlink.net>]

Ted and all,

>         One of the dark files is bad - hvra2597478.  The mean of the ADUs 
> is way out of line
>compared with the other darks.  If you display the image, it looks as if 
>someone has roughly torn
>a piece off the top of the image.  A sticky shutter?  All the other dark 
>images look good.

I just turn on and start taking darks.  The result is that the first one 
tends to be saturated from the accumulation of charge.  I assume that any 
reasonable technique (median not mean) will remove this frame.  Sorry I did 
not look and reject the first one.  I believe I took more, I just did not 
look at them since they are usually not a problem.  In any case, I think 
there are enough for the purpose.

>         Can we get a BZERO = 32768. added to the FITS headers?  It would 
> make life much easier
>when using CFITSIO.

Yes, this is possible.  What do others think about adding this??


>         Tom, what program are you using to produce star lists, once the 
> images have been flat-fielded?

They are run through the Michael Richmond pipeline.  See the home page.

Tom Droege