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ENR CTIO Blanco 4-m 2025-09-20

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Date: 
Saturday, September 20, 2025
Telescope: 
CTIO Blanco 4-m
Submitter: 
David James
Submitter Email: 
djames44@gmail.com
Observer Support: 
Alberto Alvarez
Night Assistant: 
Guillermo Damke
Also Present: 
Katya Gozman, Sasha Campana, Ani Chiti, Hernan Tirado
Problems: 

None.

Comments: 

High humidity most of the night, plus very poor seeing when we did open the dome (briefly).

There were periods -- about half the night -- where we could have openned the dome, however the seeing was typically >2.5" on the seeing monitor and we chose not to observe as all of those poor quality data would have be essentially useless to our science case. 

Conditions: 
General Conditions
Comment: 
None.
1st Quarter
Clouds: 
Clear
Precipitation: 
High Humidity
Seeing Value: 
0.00
Seeing Variability: 
0
Seeing Source: 
CTIO Seeing monitor
Sky : 
0
2nd Quarter
Clouds: 
Clear
Precipitation: 
High Humidity
Seeing Value: 
2.80
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
3rd Quarter
Clouds: 
Clear
Precipitation: 
High Humidity
Seeing Value: 
0.00
Seeing Variability: 
0
Seeing Source: 
CTIO Seeing monitor
Sky: 
0
4th Quarter
Clouds: 
Clear
Precipitation: 
High Humidity
Seeing Value: 
0.00
Seeing Variability: 
0
Seeing Source: 
CTIO Seeing monitor
Sky: 
0
Program: 
Proposal: 
2023B-646244
Target of Oportunity: 
No
Time Observed: 
0.0
Time Engineering: 
0.0
Time lost technical: 
0.0
Time lost weather: 
5.0
Time lost other: 
5.0
Description: 
MAGIC Survey
Primary Investigator: 
Ani Chiti
Email: 
achiti@uchicago.edu
Institution: 
University of Chicago
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
2025-09-20 0.0 0.0 0.0 5.0 5.0 10