Date: Tue, 25 Mar 2003 09:09:43 -0500 (EST)
From: jegunn
Subject: RE: 2.5m obslog 20030324 (MJD 52723)
I ran some raytraces a few months ago with the corrector decentered and
tilted, and there is no way that it can cause these problems. I am pretty
sure I posted those results. So we need to find another culprit. I am
(still) betting on the seating of the cartridges in the kinematics.
--jim
On Tue, 25 Mar 2003, Pete Newman wrote:
> > Thanks, Pete. Our luck has been so lousy this run that it seemed unlikely;
> > I was going to suggest a pointing model, but three out of four success
> > is not bad. Now all we need to do is understand what went wrong last
> > night.....
>
> We certainly do.  The pointing while imaging 28N on 52722 was spot on, but
> we had all that fun with spectroscopy, e.g. cartridge 7 needed an FK5 and
> then had a weird offset back at the field.  Last night (52723), same
> cartridge, same plate, we got guide stars right away.
>
> I _did_ unmount and remount the corrector this afternoon so show Jon B some
> lateral motion in the turtle cart interface to the rails, but I don't
> believe the corrector itself did anything but seat perfectly.  Don't believe
> it yet, anyway.
>
> I'm running out of head to scratch!
>
> --Pete (about to retire for the day)
>
>