[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: more details of signal-to-noise calculations for Mark IV
Tom Droege wrote:
> I thank Michael for his nice computation. The computations that I did for
> the design of the Mark IV had somewhat more pessimistic numbers for the
> photons from a mag 0 star. This led to the assumption that we would want to
> make exposures in the same range as the Mark III. 6 minutes or so.
I'm still reading Michael's message but I don't see where he
assumes we are pointing. Is it to zenith (airmass = 1.0)
or down at the equator?
Is atmospheric extinction built into the "photons from a mag
zero star" constant?
email@example.com Voice: 626-351-0089 X127
Logicon RDA, Pasadena California Fax: 626-351-0699