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Re: Photometry

As someone mentioned earlier, aperture and focal ratio may be a factor 
too. What are the differences in the systems in that regard? How about 
plate scale? S/N?

Cheers,
Michael

On Saturday, June 7, 2003, at 10:04 AM, Tom Droege wrote:

> I conclude that 0.03 mag is the practical limit of what we can do here 
> in Batavia, IL.  Andrew might differ.  We shall see what can be 
> achieved.  I note that the quoted ASAS [Acta. Astr., 50, 177] results 
> taken in a good location with inferior optics and a wider 8 degree 
> field are similar.  I have tried many things (i.e different reference 
> catalogs) to improve this error floor.   Nothing seems to make much 
> difference.