From: stephanie snedden
Subject: Re: 2.5m obslog 20051224 (MJD 53729)
Date: Sun, 25 Dec 2005 11:20:06 -0700
Congrats on your 7 plates.
Regarding plate 2055: No doubt your r1 S/N problems were related to
the scattered light warnings. Brian, Connie, David et al. will have
to tell us how much the scattered light affects the SEGUE science
results. I don't know at this point if it would be better to do more
shorter exposures or not.
Steph
On Dec 25, 2005, at 1:46 PM, observer@sdsshost2.apo.nmsu.edu wrote:
>
> Plate 2055 (cartridge 6):  Segue.  Needed an FK5 to acquire the
> guide stars.
> We took 4 exposures (6900 sec total).  According to the new SoS,
> all 4 had
> insufficient S/N in r1.  The old SoS said that only the last 2 had
> insufficient S/N in r1.  All 4 exposures were taken in good
> conditions; i.e.,
> photometric, little or no moon, okay to good seeing.  The
> conditions aren't
> going to get alot better.  If these exposures really are bad, there
> must be
> a problem with the plate.  There is sufficient S/N in the b cameras to
> declare this plate done and that's what were doing.  If the
> reduction folks
> aren't happy with it, they can declare it undone and we'll
> reobserve it.
> There's a huge list of SoS warnings.  We did a postCal as requested.
>