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ENR CTIO Blanco 4-m 2025-12-18

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Date: 
Thursday, December 18, 2025
Telescope: 
CTIO Blanco 4-m
Submitter: 
S. Panda
Submitter Email: 
swayamtrupta.panda@noirlab.edu
Observer Support: 
Manuel Hernandez
Night Assistant: 
Rodrigo Hinojosa
Also Present: 
K. Boutsia, A. Dey
Problems: 

None.

Comments: 

We observed the entire night with variable seeing, between 0.8" - 1.2", yet with transparency between ~95-100%. The humidity began to rise up, and with it the seeing and the wind speed, after 02:00 local time but stayed within acceptable limits. The seeing got better (~0.95") close to the end of the night.

Conditions: 
General Conditions
Comment: 
None.
1st Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
0.85
Seeing Variability: 
0
Seeing Source: 
The Telescope I used
Sky : 
0
2nd Quarter
Clouds: 
Thin Clouds
Wind: 
Low
Seeing Value: 
0.80
Seeing Variability: 
0
Seeing Source: 
The Telescope I used
Sky: 
0
3rd Quarter
Clouds: 
Cirrus
Wind: 
Medium
Seeing Value: 
1.10
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
1
4th Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
1.00
Seeing Variability: 
0
Seeing Source: 
The Telescope I used
Sky: 
0
Program: 
Proposal: 
2023B-184194
Target of Oportunity: 
No
Time Observed: 
8.0
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: 
NOIRLab
Instrument: 
CTIO 4m DECam
Organization: 
NOAO
Total Program Time: 
8
Total Times Time Observed Time Engineering Time lost technical Time lost weather Time lost other Total Program Time
2025-12-18 8.0 0.0 0.0 0.0 0.0 8