Date:
Thursday, October 8, 2015
Telescope:
CTIO Blanco 4-m
Submitter:
Suk Sien Tie
Submitter Email:
Observer Support:
Manuel Hernandez
Night Assistant:
Cristina Furlanetto
Problems:
1. No drinking water.
Program:
Proposal:
2012B-0001
Target of Oportunity:
No
Time Observed:
4.5
Time Engineering:
0.0
Time lost technical:
1.5
Time lost weather:
4.0
Time lost other:
0.0
Description:
The Dark Energy Survey
Primary Investigator:
Josh Frieman
Email:
Institution:
Fermilab
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 |
|---|---|---|---|---|---|---|
| 2015-10-08 | 4.5 | 0.0 | 1.5 | 4.0 | 0.0 | 10 |
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*Observing Team*
_DES Observers:_ Tim Abbott, S.S. Tie, C. Furlanetto
_Telops:_ Manuel Hernandez
_Remote Support:_ ---
*Observing Plan*
# standard bias and dome flat sequence
# evening standard stars
# run ObsTac queue
# end of night standards
# Postnight zeros
*Conditions*
# weather at 4pm CLST: Cloudy and overcast.
# weather at 8pm CLST: Still cloudy, clearer sky on the horizon to the south.
# weather at 12am CLST: Sky clearing up but still partially cloudy (60% cloud cover). Opening up telescope. 1.21" seeing.
# weather at 3am CLST: Still cloudy. Seeing typically 1.5" and was as bad as 2". Best seeing so far is 1.2".
*Accomplishments*
# Afternoon: Calibrations taken at sunset (see Synopsis Problem).
# Evening: no standards due to obvious clouds.
# aTmCam and GPS Monitor checked.
# ObsTac only for second half of the night: 483134 - 483137, 483145 - 483161, 483168 - 483232
# Morning standards: SDSSJ0200-0000 (airmass 2), SDSSJ0320-0000 (airmass 1.4), and C26202/HST (airmass 1.1)
# Post-night calibration.
*Problems tagged as Synopsis_Problem*
# Internet network failure in the control room in the middle of afternoon calibrations at 4:40 CLST. This was fixed during dinner time and all afternoon calibrations were retaken at 7:40 CLST.
# Telescope closed until 12am CLST due to clouds. However, when the telescope opened, problems with the active optics system again delayed science observations until 12:35 CLST.
# Rasicam not working.
# Lots of weird glitches one after the other with separate telescope systems. We strongly suspect these originated from the network failure during the afternoon calibrations. Altogether, we lost 80 mins.
(i) (00:57 clst) Telescope did not point to the right coordinates for first science observation (SN C2 field), ie the telescope never pointed. SISPI did not compare the coordinates it received with the coordinates the telescope was currently pointing at. TCS also didn't complain about this. Tim conjectured this to be a power problem with the generator. Aborted ObsTac and rebooted SISPI, although restarting SISPI didn't help. The telescope still wouldn't point. What eventually solved this is the TelOps restarting the TCS.
(ii) (02:23 clst) Lost active optics for exposure 483161. Paused queue and reconfigured, which skipped exposure 483162 and 483163.
(iii) (02:26 clst) SISPI giving error with the shutter. Reconfigured but this didn't solve the problem and had to restart SISPI (for the 3rd time tonight).
(iv) (3:00 clst) SISPI giving DECal error. TelOps went to check but DECal was fine.
*Minor Problems and Relevant Information*
*Notes for Data Management*