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ENR CTIO Blanco 4-m 2025-05-05

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Date: 
Monday, May 5, 2025
Telescope: 
CTIO Blanco 4-m
Submitter: 
Jan Kleyna, Gautham Narayan
Submitter Email: 
Observer Support: 
Alberto Alvarez
Night Assistant: 
None
Also Present: 
Jan Kleyna, Akash Anumarlapudi
Problems: 

UT 08:01 Mount became unresponsive after exposure - next exposure 1385174 DESIRT 315  stars trailed. TCS rebooted ~10 mins lost. Telescope pointing to NE at low elevation, and apparently mount balance in that position needs to be checked.
UT 08:21 Mount became unresponsive again after exposure 1385180 DESIRT 315 - 1385181 stars trailed - OA says TCS crashed, SISPI to TCS connection crashed, but SISPI is not detecting that TCS is down and attempts to continue observations. Issue has been reported previously.
UT 08:51 Mount became unresponsive again after exposure 1385194 - 1385195 YSE 440.A.a. stars trailed - qcInv records position from JSON file, but actual TCS position shows that that Blanco has not slewed - same location as DESIRT 315 (but done with that sequence)
UT 09:49 Mount became unresponsive during exposure 1385229 (Kleyna 2 - FMa01) stars trailed - now different elevation from DESIRT 315 by -12 degrees, so possibly issue is more complex than telescope being in some elevation band

Comments: 

None.

Conditions: 
General Conditions
Comment: 
None.
1st Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
0.95
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky : 
0
2nd Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
0.90
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
3rd Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
1.10
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
4th Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
1.00
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
Program: 
Proposal: 
2025A-729671
Target of Oportunity: 
No
Time Observed: 
11.0
Time Engineering: 
0.0
Time lost technical: 
1.0
Time lost weather: 
0.0
Time lost other: 
0.0
Description: 
DESI Transients
Primary Investigator: 
Palmese
Institution: 
Carnegie Mellon University
Instrument: 
CTIO 4m DECam
Organization: 
NOAO
Total Program Time: 
12
Total Times Time Observed Time Engineering Time lost technical Time lost weather Time lost other Total Program Time
2025-05-05 11.0 0.0 1.0 0.0 0.0 12