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CTIO Home > ENR CTIO Blanco 4-m 2017-09-16

ENR CTIO Blanco 4-m 2017-09-16

Date: 
Saturday, September 16, 2017
Telescope: 
CTIO Blanco 4-m
Submitter: 
Arjun Dey
Submitter Email: 
dey@noao.edu
Observer Support: 
Hernan Tirado
Night Assistant: 
Claudio Aguilera
Problems: 

No major problems. There were dome occultation alarms at [1] 02:07ut (during frame 678302); [2] 06:23ut (during frame 678428); [3] 07:07ut (during frame 678444)

but the frames seemed unaffected.

Comments: 

None. The observers are grateful that the request for good seeing was finally approved. We would like all the rest of our DECaLS nights just like this one, please. Pretty please.

The DIQ correlates closely with the difference between the low dome and mirror temps, which is well known, but we were surprised to see how much the low dome temp oscillated around (as much as +/-0.5C in some cases) over relatively short timescales (20-30 min). The ambient (outside) temp does not seem to show these variations, although it is a bit hard to tell from the graphs. Is there something that is dumping heat near where the low dome temp sensor is during the night?

Conditions: 
General Conditions
Comment: 
None.
1st Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
1.20
Seeing Variability: 
0.4
Seeing Source: 
The Telescope I used
Sky : 
0
2nd Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
1.00
Seeing Variability: 
0.4
Seeing Source: 
The Telescope I used
Sky: 
0
3rd Quarter
Clouds: 
Clear
Wind: 
Medium
Seeing Value: 
1.10
Seeing Variability: 
0.4
Seeing Source: 
The Telescope I used
Sky: 
0
4th Quarter
Clouds: 
Clear
Seeing Value: 
1.10
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
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Program: 
Proposal: 
2014B-0404
Target of Oportunity: 
No
Time Observed: 
10.0
Time Engineering: 
0.0
Time lost technical: 
0.0
Time lost weather: 
0.0
Time lost other: 
0.0
Description: 
DECaLS
Primary Investigator: 
Schlegel & Dey
Email: 
djschlegel@lbl.gov [1]
Institution: 
Lawrence Berkeley National Laboratory
Instrument: 
CTIO 4m DECam
Organization: 
NOAO
Total Program Time: 
10
Total Times Time Observed Time Engineering Time lost technical Time lost weather Time lost other Total Program Time
2017-09-16 10.0 0.0 0.0 0.0 0.0 10
Source URL (modified on 09/17/2017 - 06:59): http://www.ctio.noao.edu/noao/content/ENR-CTIO-Blanco-4-m-2017-09-16

Links
[1] mailto:djschlegel@lbl.gov
[2] http://www.ctio.noao.edu/noao/field-collection/field-nr-prog/4217/delete?destination=print/node/12561
[3] http://www.ctio.noao.edu/noao/field-collection/field-nr-prog/4217/edit?destination=print/node/12561
[4] http://www.ctio.noao.edu/noao/field-collection/field-nr-prog/add/node/12561?destination=print/node/12561