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ENR CTIO Blanco 4-m 2025-12-27

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Date: 
Saturday, December 27, 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: 
Arjun Dey, Kathy Vivas, Yu-Hsiu Huang
Problems: 

Pressure lost at 11pm. Observations were stopped. 1h10min lost

DECAL frozen at 5am. Observations were stopped. 20 min lost.

Comments: 

None.

Conditions: 
General Conditions
Temperature Max: 
15.00
Temperature Min: 
13.00
Humidity Max: 
70
Humidity Min: 
25
Wind Speed Max: 
6.00
Wind Speed Min: 
0.00
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: 
Partially cloudy
Seeing Value: 
0.90
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
4
3rd Quarter
Clouds: 
Thin Clouds
Wind: 
Low
Seeing Value: 
1.00
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
2
4th Quarter
Clouds: 
Thin Clouds
Wind: 
Low
Seeing Value: 
0.90
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
2
Program: 
Proposal: 
2025B-608414
Target of Oportunity: 
No
Time Observed: 
2.5
Time Engineering: 
0.0
Time lost technical: 
1.25
Time lost weather: 
0.0
Time lost other: 
0.0
Description: 
Variable stars in the Fornax dSph galaxy
Primary Investigator: 
Vivas
Email: 
kathy.vivas@noirlab.edu
Institution: 
CTIO
Instrument: 
CTIO 4m DECam
Organization: 
NOAO
Total Program Time: 
3.75
Proposal: 
2023B-184194
Target of Oportunity: 
No
Time Observed: 
4.25
Time Engineering: 
0.0
Time lost technical: 
0.25
Time lost weather: 
0.0
Time lost other: 
0.0
Description: 
Efficiently mapping the z>2 galaxies
Primary Investigator: 
A. Dey, D. Schlegel
Email: 
arjun.dey@noirlab.edu
Institution: 
NOAO
Instrument: 
CTIO 4m DECam
Organization: 
NOAO
Total Program Time: 
4.5
Total Times Time Observed Time Engineering Time lost technical Time lost weather Time lost other Total Program Time
2025-12-27 6.75 0.0 1.5 0.0 0.0 8.25