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ENR CTIO Blanco 4-m 2025-12-28

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Date: 
Sunday, December 28, 2025
Telescope: 
CTIO Blanco 4-m
Submitter: 
Yu-Hsiu Huang
Submitter Email: 
yhhuang@arizona.edu
Observer Support: 
Hernan Tirado
Night Assistant: 
Rodrigo Hernandez
Also Present: 
Kathy Vivas, Arjun Dey, Yu-Hsiu Huang
Problems: 

None.

Comments: 

First half: beautiful seeing!

Second half: clear sky, seeing around 1-1.2"

Conditions: 
General Conditions
Temperature Max: 
18.00
Temperature Min: 
15.00
Humidity Max: 
58
Humidity Min: 
25
Wind Speed Max: 
5.00
Wind Speed Min: 
1.00
Comment: 
None.
1st Quarter
Clouds: 
Thin Clouds
Wind: 
Low
Seeing Value: 
0.90
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky : 
1
2nd Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
0.85
Seeing Variability: 
0
Seeing Source: 
The Telescope I used
Sky: 
0
3rd Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
1.00
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
4th Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
1.05
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
Program: 
Proposal: 
2025B-608414
Target of Oportunity: 
No
Time Observed: 
3.75
Time Engineering: 
0.0
Time lost technical: 
0.0
Time lost weather: 
0.0
Time lost other: 
0.0
Description: 
Variable stars in Fornax dSph galaxy
Primary Investigator: 
Vivas
Email: 
kathy.vivas@noirlab.edu
Institution: 
CTIO
Instrument: 
CTIO 4m DECam
Organization: 
DD
Total Program Time: 
3.75
Proposal: 
2023B-184194
Target of Oportunity: 
No
Time Observed: 
4.0
Time Engineering: 
0.0
Time lost technical: 
0.0
Time lost weather: 
0.0
Time lost other: 
0.0
Description: 
Efficiently mapping the z>2 galaxies
Primary Investigator: 
Arjun Dey, David Schlegel
Email: 
arjun.dey@noirlab.edu
Institution: 
NOAO
Instrument: 
CTIO 4m DECam
Organization: 
NOAO
Total Program Time: 
4
Total Times Time Observed Time Engineering Time lost technical Time lost weather Time lost other Total Program Time
2025-12-28 7.75 0.0 0.0 0.0 0.0 7.75