Re: [TASS] Flat fielding

[Chris Albertson <chrisja@jps.net>]

Andrew Bennett wrote:
>

> Ah! It should be. But is it? Are all the
> flatfield images up to standard? Or could this
> be a major contributor to the 0.05 magnitude
> noise floor?

Question:  Anyone know off hand the relationship
between ADU and magnitude for the Mk III.  I an
just wondering how many ADU = 0.05 magnitude for
a typical Mk III star
>
> In other contexts, the importance is stressed
> of averaging as many flatfield determinations
> as possible. As far as I can see, our software
> does not allow for averaging. Should it?

In a way we  do average.  We use a flat __vector__
which is made by combining many scan lines.

I would like to think about numberic problems
due to finite 16-bit arithmatic.  I'd need to
know the answer to the above question.
>
> Andrew Bennett, Avondale Vineyard, Nova Scotia, Canada.

--
   --Chris Albertson             home: chrisja@jps.net
     Redondo Beach, California   work: calbertson@logicon.com