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Daily Reports

Dec. 6th, Tuesday

10:30-15:00; Stergios: No observations. Sub-reflector out of order, the team is repairing it at the moment. The problem was identified at the backplane which was replaced. High opacity with low wind. We switched and configured the new run (i.e., run74) and everything seem to work in order. Data acquisition was also conducted with bad pixels of 30, 7, 51 for the array 1, 2 and 3, respectively.

15:00-21:00; Juan:

21:00-03:00; Quang: We observe the project 105-22, Tau225 was about 0.18, P2P fluctuation was 10 Jy. We did 4 scans of B213-16 (s42 ~ s45), after that we did a POINTING, focusing on 0439+360. We did skydip and POINTING to 0529+075 around 22:10 then focusing & calibration. At last we did 7 scans of B213-16 (s60, s19~s24).

Dec. 7th, Wednesday

03:00-08:00; Jean-François: Finish up project 105-22 (B213-C6) started by Quang. Over the night, opacity was "high" between 0.3 and 0.45 but the atmospheric fluctuations were fairly low (< abs(+/-10) Jy/b peak-to-peak at 2mm). Start with focus and beammap on 0316+413 (3C84) with stability ±3Jy/b at 2mm. Project 159-22 (NGC1569). During last hour, project 169-22 (GJ526North) when other projects were too low in elevation. Stop early at 8:00 local time because of POLAMI.

08:00-10:30; Albrecht: (POLAMI)

10:30-15:00; Maintenance + System check

15:00-21:00; Juan:

21:00-03:00; Quang: No observations due to high tau.

Dec. 8th, Thursday

03:00-08:00; Jean-François: No observations due to high tau/wind.

08:00-11:00; Albrecht: (POLAMI - no observations).

11:00-15:00; Hélène: No observations due to high tau/wind.

15:00-21:00; Juan: No observations due to high tau/wind.

21:00-03:00; Quang: No observations, high wind (>20m/s) with rain and snow.

Dec. 9th, Friday

03:00-09:00; Jean-François: No observations. High wind (>20m/s) with rain and snow. The anemometer seems frozen showing different values from the actual ones.

09:00-15:00; Matthew: No observations. High wind/tau.

15:00-21:00; Juan: No observations. High wind, snowing.

21:00-03:00; Quang: No observations. High wind, fog, snowing.

Dec. 10th, Saturday

03:00-09:00; Stergios: No observations. It's still snowing/freezing rain while the wind is still above the limit. Antenna parked:

09:00-15:00; Hélène: No observations. The wind decreased but we still have thick clouds/ high tau.

15:00-21:00; Juan: No observations. After 16:00 UTC the weather improved with lower taus and wind, however the operators checked the sub-reflector for possible ice and it looked completely frozen, due to the ice storm of yesterday night. The ice cannot be removed at this stage so we park the antenna again.

21:00-03:00; Quang: No observations. See comment above.

Dec. 11th, Sunday

03:00-09:00; Stergios: No observations. Heavy rain and high wind.

09:00-15:00; Hélène: No observations. High wind and dense clouds (tau>1 at all times).

15:00-21:00; Juan: No observations. Lower wind values but with high opacity.

21:00-03:00; Frederic: The weather improved, we had lower tau and wind values so we started (around 1:15 UTC) observing the EMIR backup porjects, starting with 120-22.

Dec. 12th, Monday

03:00-09:00; Frederic/Stergios: We continue EMIR observations under the project 162-22. Tau increased to ~0.85.

09:00-15:00; Hélène/Stergios: Continuing with EMIR observations and project 162-22 until 10:50 UTC. We switched to project 135-22 after this time. The opacity is high with pwv values given in the calibrations below 10mm at most times. Stopped at 11:30 UTC due to high opacity. No data from the project 135-22 could be acquired.

15:00-21:00; Juan:

21:00-03:00; Quang:

Dec. 13th, Tuesday

03:00-08:00; Jean-François:

09:00-10:30; Stergios: