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ENR CTIO Blanco 4-m 2025-09-22

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Date: 
Monday, September 22, 2025
Telescope: 
CTIO Blanco 4-m
Submitter: 
Ting Li
Submitter Email: 
ting.li@astro.utoronto.ca
Observer Support: 
Hernan Tirado
Night Assistant: 
Alberto Alvarez
Also Present: 
R.Hernandez, R. Aviles, K. Boutsia
Problems: 

None.

Comments: 

In the first half of the night, the dimm has been reporting 0.7" for significant amount of time, but the seeing reported by image health never went below 1.2". However, in the second half, with same dimm seeing at 0.7", the seeing reported by image health change to 1.0". 

At the beginning of the night communication to the mount was lost and the TO had to go up and fix it. Time lost  <10min 

Conditions: 
General Conditions
Comment: 
None.
1st Quarter
Clouds: 
Cirrus
Wind: 
Low
Seeing Value: 
1.30
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky : 
6
2nd Quarter
Clouds: 
Thin Clouds
Wind: 
Low
Seeing Value: 
1.20
Seeing Variability: 
0
Seeing Source: 
The Telescope I used
Sky: 
2
3rd Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
1.10
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
4th Quarter
Clouds: 
Clear
Seeing Value: 
0.90
Seeing Variability: 
0
Seeing Source: 
The Telescope I used
Sky: 
0
Program: 
Proposal: 
2025B-479281
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: 
IBIS
Primary Investigator: 
Dey-Schlegel
Email: 
arjun.dey@noirlab.edu
Institution: 
NOAO
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
2025-09-22 10.0 0.0 0.0 0.0 0.0 10