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CTIO Home > ENR CTIO Blanco 4-m 2025-12-14

ENR CTIO Blanco 4-m 2025-12-14

Date: 
Sunday, December 14, 2025
Telescope: 
CTIO Blanco 4-m
Submitter: 
Damián Pacheco
Submitter Email: 
dampach@uc.cl
Observer Support: 
Roberto Aviles
Night Assistant: 
None
Also Present: 
Alfredo Zenteno
Problems: 

Images presented deformations since image 280 at 1:48 UTC / 22:48 CT. Tried to improve the imaging by restarting SISPI. We took 3 images of 30 sec and the images looked better but not perfect (the trim value was about 700), then the trim value lowered to 670 degrading again the images.  Because of that the z trim value was changed manually to 750 and the imaging was greatly improved. After several images the trim value remained constant at 750.  For some reason it seems that the trim value mostly did not changed, and when it did, it did it for worse

Comments: 

None.

Conditions: 
General Conditions
Comment: 
None.
1st Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
1.90
Seeing Variability: 
0.4
Seeing Source: 
The Telescope I used
Sky : 
0
2nd Quarter
Clouds: 
Clear
Seeing Value: 
0.00
Seeing Variability: 
0
Seeing Source: 
CTIO Seeing monitor
Sky: 
0
3rd Quarter
Clouds: 
Thin Clouds
Wind: 
Low
Seeing Value: 
1.40
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
4th Quarter
Clouds: 
Thin Clouds
Wind: 
Medium
Seeing Value: 
1.60
Seeing Variability: 
0.4
Seeing Source: 
The Telescope I used
Sky: 
0
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Program: 
Proposal: 
2025B-878440
Target of Oportunity: 
No
Time Observed: 
3.75
Time Engineering: 
0.0
Time lost technical: 
0.25
Time lost weather: 
0.0
Time lost other: 
0.0
Description: 
Building an Independent Low Redshift Cosmology Sample of Type Ia Supernovae with DECam
Primary Investigator: 
Dillon Brout
Email: 
dbrout@bu.edu [1]
Institution: 
Boston University
Instrument: 
CTIO 4m DECam
Organization: 
Chile
Total Program Time: 
4
Proposal: 
2023B-184194
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: 
IBIS
Primary Investigator: 
Dey-Schlegel
Email: 
arjun.dey@noirlab.edu [4]
Institution: 
NOIRLab
Instrument: 
CTIO 4m DECam
Organization: 
NOAO
Total Program Time: 
3.75
Total Times Time Observed Time Engineering Time lost technical Time lost weather Time lost other Total Program Time
2025-12-14 7.5 0.0 0.25 0.0 0.0 7.75
Source URL (modified on 12/15/2025 - 05:47): http://www.ctio.noao.edu/noao/node/23478

Links
[1] mailto:dbrout@bu.edu
[2] http://www.ctio.noao.edu/noao/field-collection/field-nr-prog/44880/delete?destination=print/content/enr-ctio-blanco-4-m-2025-12-14
[3] http://www.ctio.noao.edu/noao/field-collection/field-nr-prog/44880/edit?destination=print/content/enr-ctio-blanco-4-m-2025-12-14
[4] mailto:arjun.dey@noirlab.edu
[5] http://www.ctio.noao.edu/noao/field-collection/field-nr-prog/44881/delete?destination=print/content/enr-ctio-blanco-4-m-2025-12-14
[6] http://www.ctio.noao.edu/noao/field-collection/field-nr-prog/44881/edit?destination=print/content/enr-ctio-blanco-4-m-2025-12-14
[7] http://www.ctio.noao.edu/noao/field-collection/field-nr-prog/add/node/23478?destination=print/content/enr-ctio-blanco-4-m-2025-12-14