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ENR CTIO Blanco 4-m 2025-12-20

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Date: 
Saturday, December 20, 2025
Telescope: 
CTIO Blanco 4-m
Submitter: 
Tomás Cabrera
Submitter Email: 
tcabrera@andrew.cmu.edu
Observer Support: 
Manuel Hernandez
Night Assistant: 
Rodrigo Hinojosa
Also Present: 
Marina Pavlovic, Rogerio Monteiro-Oliveira, Alfredo Zenteno
Problems: 

None.

Comments: 

None.

Conditions: 
General Conditions
Comment: 
None.
1st Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
1.10
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky : 
0
2nd Quarter
Clouds: 
Clear
Seeing Value: 
1.70
Seeing Variability: 
0.2
Seeing Source: 
CTIO Seeing monitor
Sky: 
0
3rd Quarter
Clouds: 
Clear
Wind: 
Medium
Seeing Value: 
1.20
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
4th Quarter
Clouds: 
Clear
Wind: 
Medium
Seeing Value: 
1.20
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
Program: 
Proposal: 
2025B-441993
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: 
Mapping Dark Matter
Primary Investigator: 
Rogerio Monteiro
Email: 
rmo@on.br
Institution: 
Observatorio Nacional
Instrument: 
CTIO 4m DECam
Organization: 
NOAO
Total Program Time: 
3.75
Proposal: 
2022A-246202
Target of Oportunity: 
No
Time Observed: 
3.5
Time Engineering: 
0.0
Time lost technical: 
0.0
Time lost weather: 
0.0
Time lost other: 
0.0
Description: 
A Uniform Survey for Extreme Trans-Neptunian Objects
Primary Investigator: 
Scott Sheppard
Email: 
ssheppard@carnegiescience.edu
Institution: 
Carnegie Institution for Science in Washington, DC
Instrument: 
CTIO 4m DECam
Organization: 
N/A
Total Program Time: 
3.5
Total Times Time Observed Time Engineering Time lost technical Time lost weather Time lost other Total Program Time
2025-12-20 7.25 0.0 0.0 0.0 0.0 7.25