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ENR CTIO Blanco 4-m 2025-10-05

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Date: 
Sunday, October 5, 2025
Telescope: 
CTIO Blanco 4-m
Submitter: 
Guillermo Damke (1st half) /
Submitter Email: 
guillermo.damke@noirlab.edu
Observer Support: 
Rodrigo Hernandez
Night Assistant: 
Alberto Alvarez
Also Present: 
Roberto Avilés, Sean Points
Problems: 

The first-half: None.

The second-half: The guider missed the guide star, and after restoration, and then the telescope was pointed to a wrong field. We need to recheck the pointing before continue the sequence. This occured twice, and for each time the process took about 30 mins. Four exposures were taken in the wrong field. Since there is no much time left when the second time happened, we just pointed the telescope to a direction roughly matching our target (withi 2 arcmin). However, even if we come back to the sequence, the focus has also been off and there was no time to fix, so we have to stop the observation earier. In total, there were 0.5 hr lost during the middle of the run, and another 1 hr lost at the end of the night due to the failed guiding + lost the field + defocus.

Comments: 

None.

Conditions: 
General Conditions
Comment: 
None.
1st Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
1.60
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky : 
0
2nd Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
1.80
Seeing Variability: 
0.4
Seeing Source: 
The Telescope I used
Sky: 
0
3rd Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
0.80
Seeing Variability: 
0
Seeing Source: 
The Telescope I used
Sky: 
0
4th Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
0.80
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
Program: 
Proposal: 
AEON
Target of Oportunity: 
No
Time Observed: 
5.0
Time Engineering: 
0.0
Time lost technical: 
0.0
Time lost weather: 
0.0
Time lost other: 
0.0
Description: 
NEWFIRM AEON observations
Primary Investigator: 
Guillermo Damke
Email: 
guillermo.damke@noirlab.edu
Institution: 
CTIO
Instrument: 
CTIO 4m Newfirm
Organization: 
NOAO
Total Program Time: 
5
Proposal: 
2025B-897187
Target of Oportunity: 
No
Time Observed: 
3.0
Time Engineering: 
0.0
Time lost technical: 
1.5
Time lost weather: 
0.0
Time lost other: 
0.0
Description: 
Narrow-Band H-alpha Survey of the Large-Scale Structure around a QSO Cluster
Primary Investigator: 
Yongming Liang
Email: 
ymliang@icrr.u-tokyo.ac.jp
Institution: 
U of Tokyo
Instrument: 
CTIO 4m Newfirm
Organization: 
N/A
Total Program Time: 
4.5
Total Times Time Observed Time Engineering Time lost technical Time lost weather Time lost other Total Program Time
2025-10-05 8.0 0.0 1.5 0.0 0.0 9.5