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Re: [APML]: More Pics - IC 1318, M31
> From: "Philip Perkins" <philip@astrocruise.com>
> I believe that two things affect the degree of field rotation (for any given
> polar misalignment) - a) the FOV of the image - b) distance from the pole of
> the object being imaged. From these observations it would appear that
> objects nearest the pole are subject to greatest field rotation - is this
> correct? AMOACP doesn't seem to be very clear on this point.
There is a formula I could dig up for field rotation if you want it.
It's not as simple a relationship as you think. Off hand I think it
depends on degree of polar axis misalignment, location of the object
in the sky (depends on hour angle, not just r.a.) and some other
values.
Tom Krajci
Capt Tom Krajci
B-52 Intelligence Officer
"Trust. . .but verify! (Soviet maxim)"
http://spur.barksdale.af.mil