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| Weather clearing up. Some ice on legs and sub-reflector. Operator is going up. UT18:23. DAQ started around 19 UTC with 49/6/62 bad pixels for arrays 1/2/3, respectively. Calibration observations on the closest source 2251+158. A series of pointings/focus shows astigmatism with two lobes present at the final image, which might be caused from the recent stop of the de-icing. Eventually we moved to Uranus aiming for better calibration results. Carsten takes over. Good stability and tau around 0.2. | Weather clearing up, however ice is present on the legs and sub-reflector (18:23 UTC). Operator removed successfully the ice/snow from the antenna. DAQ started around 19:00 UTC with final measurements of 49/6/62 bad pixels for arrays 1/2/3, respectively. We continued with calibration observations on the pointing source 2251+158. A series of pointing/focus revealed some kind of astigmatism with two 'lobes' present at the final image, which might be caused from the recent stop of the de-icing. After many focus repetitions on this source the feature persisted. Eventually we moved to Uranus aiming for better calibration results. Carsten takes over. Good stability (peak-to-peak always below 3 Jy/beam) and tau around 0.2 at most times. |
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| 21:00-03:00; Carsten: | 21:00-03:00; Carsten: Uranus pointing, focus finally improving. calib_1scan. COSMOS started at 22:30UT. tau225~0.28. El>35deg. p2p<4Jy/b@2mm most of the time. |
Daily Reports
Contents
Jan. 24th, Tuesday
16:00-21:00; Stergios: Maintenance finished around 16:00 (local time). Snowing and dense clouds prevent us from observing even with EMIR.
Weather clearing up, however ice is present on the legs and sub-reflector (18:23 UTC). Operator removed successfully the ice/snow from the antenna. DAQ started around 19:00 UTC with final measurements of 49/6/62 bad pixels for arrays 1/2/3, respectively. We continued with calibration observations on the pointing source 2251+158. A series of pointing/focus revealed some kind of astigmatism with two 'lobes' present at the final image, which might be caused from the recent stop of the de-icing. After many focus repetitions on this source the feature persisted. Eventually we moved to Uranus aiming for better calibration results. Carsten takes over. Good stability (peak-to-peak always below 3 Jy/beam) and tau around 0.2 at most times.
21:00-03:00; Carsten: Uranus pointing, focus finally improving. calib_1scan. COSMOS started at 22:30UT. tau225~0.28. El>35deg. p2p<4Jy/b@2mm most of the time.
Jan. 25th, Wednesday
Jan. 26th, Thursday
Jan. 27th, Friday
Jan. 28th, Saturday
Jan. 29th, Sunday
Jan. 30th, Monday