Subject: Re: [sloan-25mlog 2997] 2.5m obslog 20160603 (SJD 57543)
From: Renbin Yan
Date: Sat, 4 Jun 2016 10:20:17 -0400
Hi Kaike,=20
I think we can charge these to weather, just for this time. In general, =
it may be more useful=20
to do MaNGA observations under seeing around 2.5". Although these =
exposures
won't contribute to MaNGA plate completeness and won't go into the final =
datacube,
the data can still be useful for certain science cases, as MaNGA still =
get high S/N
under these seeing.=20
For eBOSS and RM plates, their S/N deteriorate badly with increasing =
seeing.=20
So, for 2.5" seeing, they don't get very useful data.=20
best,
-renbin
On Jun 4, 2016, at 8:52 AM, Kaike Pan  wrote:
>>=20
>> On Jun 4, 2016, at 5:13 AM, doravetz@apo.nmsu.edu wrote:
>>=20
>>=20
>>                      APACHE POINT OBSERVATORY SDSS 2.5M
>>=20
>>                                OBSERVING LOG
>>                         Friday June 03, 2016
>>=20
>>                                 (SJD 57543)
>>=20
>> ----  Observing Team ----
>>=20
>> Karen Kinemuchi
>> Dan Oravetz
>>=20
>> ---- Observing Summary ----
>>=20
>> Partly cloudy with poor seeing, but we were open all night.
>>=20
>> Three hours of MaNGA time was used on the RM plate (7339); note that =
the seeing
>> (>2.4" FWHM generally) was such that MaNGA would not have obtained =
usable data
>> during this time given their seeing constraints.
>>=20
>=20
> RM required the  plate to be observed in weather conditions slightly =
better than the average with=20
> the concern that total used hours may excess allocated hours. Last =
night, I discussed with Karen
> and Dan on which cartridge we should start with. Although we know the =
seeing will not be great
> without any observations before the first plate, we were not sure how =
bad the seeing would be.
> Consider that weather forecast for next week does not look good, the =
sky was improving at=20
> the moment. Observers decided to give the RM plate a try. After we the =
first exposure, we know
> that the conditions was well below the average. However, considering =
such seeing will not
> give MaNGA any data sets. Observers decided to stay on RM plate in =
hope that it may result
> some useful data.=20
>=20
> If Renbin and other MaNGA people agree, I suggest that we charge these =
hours to weather,
> NOT to RM project considering that most of data taken was below their =
S/N threshold (S/N^2 > 0.5),=20
> and that MaNGA would not get any data sets neither in such conditions.=20=
>=20
> -kaike
>=20
>=20
> ____________________________________________________________
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--
Renbin Yan
Assistant Professor
Department of Physics and Astronomy
177 Chemistry-Physics Building
University of Kentucky
Lexington, KY, 40506-0055
(1) 859-257-0795