Subject: Re: [sdss3-25mlog 78] 2.5m obslog 20110406 (MJD 55658)
From: David Schlegel
Date: Fri, 8 Apr 2011 14:22:15 -0700
Kaike,
A good question.  The answer should be that we keep doing this as a =
monthly
task at least through to this summer shutdown, and then assess at that =
point
if the lossy fiber flats make this unnecessary.
There has been one added benefit to doing these: It exercises the =
collimators,
and is a good way to trigger any errors in those actuators + control =
code.
Thanks,
David
On Apr 7, 2011, at 6:32 AM, Kaike Pan wrote:
> Hi David and Stephen,
>=20
>     With lossy fiber data, do we still need to dithered flats? Thanks,
>=20
>    -kaike
>=20
> On Apr 7, 2011, at 4:55 AM, asimmons@apo.nmsu.edu wrote:
>=20
>>=20
>>                      APACHE POINT OBSERVATORY SDSS 2.5M
>>=20
>>                                OBSERVING LOG
>>                         Wednesday April 06, 2011
>>=20
>>                                 (MJD 55658)
>>=20
>> ----  Observing Team ----
>>=20
>> Viktor Malanushenko
>> Audrey Simmons
>>=20
>> ---- Observing Plan ----
>>=20
>> BOSS
>>=20
>> ---- Observing Summary ----
>>=20
>> Lots of clouds, dust, wind, and a little sprinkle of rain. We never =
opened.
>>=20
>> We completed dithered flats on cartridges 17 and 18.
>>=20
>=20