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ENR CTIO Blanco 4-m 2025-07-07

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Date: 
Monday, July 7, 2025
Telescope: 
CTIO Blanco 4-m
Submitter: 
Anish Aradhey
Submitter Email: 
aaradhey@unc.edu
Observer Support: 
Manuel Hernandez
Night Assistant: 
Claudio Aguilera
Also Present: 
Alfredo Zenteno
Problems: 

At ~09:00 UT / 05:00 ET our exposures stopped and we received an alarm for a broken interlock. The reason for this alarm was not clear. We attempted to fix the problem by pressing 'configure' in the observer console, which brought back OCS but not the interlock. Claudio restarted SISPI, which took more time than usual and did not fix the problem alone. Claudio then restarted the TCS, which also did not resolve the issue. Finally, Claudio restarted both the TCS-app and TCS and we pressed Configure in the Observer Console, which returned everything to normal. Since resolving the issue required restarting the TCS-app, it seems that problem was communication with the TCS.

Comments: 

There was a spike in seeing that lasted around 15 minutes around ~07:00 UTC / 03:00 ET. During this time the seeing increased from ~1" to ~1.5".

Conditions: 
General Conditions
Temperature Max: 
20.00
Temperature Min: 
17.00
Humidity Max: 
8
Humidity Min: 
3
Wind Speed Max: 
6.00
Wind Speed Min: 
2.00
Comment: 
None.
1st Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
1.10
Seeing Variability: 
0.2
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: 
Low
Seeing Value: 
1.30
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
4th Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
1.20
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
Program: 
Proposal: 
2025A-316276
Target of Oportunity: 
No
Time Observed: 
10.75
Time Engineering: 
0.0
Time lost technical: 
0.75
Time lost weather: 
0.0
Time lost other: 
0.0
Description: 
Dipole Oriented SN Cosmology (DOSC)
Primary Investigator: 
Clocchiatti
Email: 
aclocchi@astro.puc.cl
Institution: 
Instituto de Astrofísica, PUC, Chile
Instrument: 
CTIO 4m DECam
Organization: 
DD
Total Program Time: 
11.5
Total Times Time Observed Time Engineering Time lost technical Time lost weather Time lost other Total Program Time
2025-07-07 10.75 0.0 0.75 0.0 0.0 11.5