Published on CTIO (http://www.ctio.noao.edu/noao)

CTIO Home > ENR CTIO Blanco 4-m 2014-10-25

ENR CTIO Blanco 4-m 2014-10-25

Date: 
Saturday, October 25, 2014
Telescope: 
CTIO Blanco 4-m
Submitter: 
Liz Buckley-Geer
Submitter Email: 
buckley@fnal.gov
Observer Support: 
DES Run manager
Night Assistant: 
Alberto Alvarez
Also Present: 
Keith Bechtol, David James
Problems: 

SISPI hung at about 11:40 local time. Study of the log files indcated that OBSTAC was failing to choose the next OBSTAC field, and was not populating the observing queue. Eric Neilsen also found that because we are having a **very** good seeing night, that OBSTAC's use of a pre-configured instrumental seeing of 0.65 -- which is subtracted in quadrature from the seeing value returned by Image Health -- results in a non-physical, imaginary number (or negative number) which is returned during those instances of very good seeing (like is occurring tonight), with Image Health values of < 0.65 arcsecs.

This return of a non-physical number caused OBSTAC to hang/crash and not populate the observing queue. However it is not clear why this would cause SISPI to freeze. Klaus will need to take a look at the OCS code.

Comments: 

None.

Conditions: 
General Conditions
Comment: 
None.
1st Quarter
Clouds: 
Clear
Seeing Value: 
0.60
Seeing Variability: 
0
Seeing Source: 
CTIO Seeing monitor
Sky : 
0
2nd Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
0.70
Seeing Variability: 
0.2
Seeing Source: 
CTIO Seeing monitor
Sky: 
0
3rd Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
0.50
Seeing Variability: 
0.2
Seeing Source: 
CTIO Seeing monitor
Sky: 
0
4th Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
0.55
Seeing Variability: 
0.2
Seeing Source: 
CTIO Seeing monitor
Sky: 
0
  • Delete
  • Edit
Program: 
Proposal: 
2014B-0001
Target of Oportunity: 
No
Time Observed: 
7.5
Time Engineering: 
0.0
Time lost technical: 
1.25
Time lost weather: 
0.0
Time lost other: 
0.0
Description: 
Dark Energy Survey
Primary Investigator: 
Josh Frieman
Email: 
frieman@fnal.gov [1]
Institution: 
Fermilab
Instrument: 
CTIO 4m DECam
Organization: 
NOAO
Total Program Time: 
8.75
Total Times Time Observed Time Engineering Time lost technical Time lost weather Time lost other Total Program Time
2014-10-25 7.5 0.0 1.25 0.0 0.0 8.75
Source URL (modified on 10/26/2014 - 06:15): http://www.ctio.noao.edu/noao/node/6563

Links
[1] mailto:frieman@fnal.gov
[2] http://www.ctio.noao.edu/noao/field-collection/field-nr-prog/1861/delete?destination=print/content/enr-ctio-blanco-4-m-2014-10-25
[3] http://www.ctio.noao.edu/noao/field-collection/field-nr-prog/1861/edit?destination=print/content/enr-ctio-blanco-4-m-2014-10-25
[4] http://www.ctio.noao.edu/noao/field-collection/field-nr-prog/add/node/6563?destination=print/content/enr-ctio-blanco-4-m-2014-10-25