Date: Tue, 7 Nov 2006 23:22:11 -0500 (EST)
From: jeg@astro.princeton.edu
Subject: Re: 2.5m obslog 20061104 (MJD 54044)
Thanks, Kaike. That makes sense. These data should be very useful. thanks
to all.
--jim
On Tue, 7 Nov 2006, kpan@apo.nmsu.edu wrote:
> Hi Steph and Jim,
>
>  When I checked the spectra, the ADU counts of 1200s exposures are
> typically
> 4000. The highest level i saw was about 12000 in r2. I did not see any
> indication of
> saturations.
>
>  cheers,
>
>  kaike
>
>
> Original Message:
> -----------------
> From: stephanie snedden snedden@apo.nmsu.edu
> Date: Tue, 7 Nov 2006 11:29:43 -0700
> To: harvanek@apo.nmsu.edu, obs-report-25m@apo.nmsu.edu,
> jeg@astro.princeton.edu
> Subject: Re: 2.5m obslog 20061104 (MJD 54044)
>
>
> Hi Jim,
>
> A quick glance when Kaike was observing this plate last night did not
> indicate saturation in a fifteen minute exposure, but I did not look
> at all the fibers. I'm guessing at this point that SoS was
> complaining honestly about the sky levels. Mike or Kaike may have
> looked at the fits images themselves. If so, they can confirm/deny
> this, or I will check it myself later.
>
> Steph
> On Nov 7, 2006, at 8:07 AM, jeg@astro.princeton.edu wrote:
>
>>
>> It is my understanding that Brian/Huan used regular candidate standard
>> stars for all the stars on this plate--so except for the bright sky
>> (which is still faint compared to the standards) the normal 900s
>> exposure time SHOULD have been fine. The way to check for problems
>> is to look for saturation--ie to check for substantial numbers of
>> pixels
>> with ADU greater than 65000, say. I could imagine that SoS might have
>> problems with these plates.
>>
>> thanks
>>
>> --jim
>>
>
>
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