Re: [TASS] Flat fielding

[Andrew Bennett <andrew.bennett@NS.SYMPATICO.CA>]

On Thu, 9 Sep 1999 08:57:04 -0700, Chris Albertson <chrisja@JPS.NET> wrote:

>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
The bright stars for which the 0.05 mags noise
floor applies will be over 2,000 ADU so 0.05
magnitude is over 100 ADU. Truncation errors
with 16-bit arithmetic are entirely negligible
unless one is doing the sums horribly wrong.
Which has been known to happen (I am thinking
of a professional image processing package somebody
once tried to sell me) but surely not in TASS!

Andrew Bennett, Avondale Vineyard, Nova Scotia, Canada.