Date: Wed, 1 May 2002 09:03:27 -0500 (CDT)
From: Stephen Kent
Subject: Re: 2.5m obslog 20020430 (MJD 52395)
> 07:03Z  Plate 917, cartridge 4.  No useful data.  Guide stars after gotoField.
> Sky brightness 1.0 MU.  First 900sec exposure useless due to poor seeing and
> moon, second and third 1800sec had sky rates reported in red by SoS -
> frustrating!  We abandoned this plate and moved to another plate now available
> with lower sky brightness.
>
>
> 08:54Z  Plate 818, cartridge 1.  Done in 3 exposures.  Guide stars after
> gotoField (at 84 deg altitude with offsets from last plate - we like this!).
> Sky brightness 0.6 MU.  SoS reported camera b2 in red for the smear, but we
> are declaring this plate done in any case.
>
This is good feedback on how much moon we can tolerate.  More calibration
points will be welcome.
Note that the value for "Moon units" is calculated for the design hour
angle of the plate (i.e., the time of night marked by the white "X").
Steve