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| 16:00-21:00; Stergios: snowing, de-icing at 100%... | 16:00-21:00; Stergios: Maintenance finished around 16:00 (local time). Snowing and dense clouds prevent us from observing even with EMIR. <<BR>> [[attachment:snowing_antena.jpeg|{{attachment:snowing_antena.jpeg||width=600}}|target="_blank"]] <<BR>> 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: De-iciung had been on till 19:00UT. Beam and Focus looked poor till about 22:00UT. Pointing and focus on Uranus OK. Skydip. calib_1scan. COSMOS started at 22:30UT. tau225~0.28 slowly improving to 0.17. El>35deg. p2p<~4Jy/b@2mm on all the hourly pointings. The COSMOS timelines did however show larger variations +-5 up to 20Jy/b. 12 scans done. |
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03-09: FXD: 2 hours on COSMOS. I did focus in between. Best is 18x19 arcsec at 2mm. p2p variations are well below +-3 Jy/b on pointing scans. Tau=0.2 stable. -10 degC. Cloudy. |
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: De-iciung had been on till 19:00UT. Beam and Focus looked poor till about 22:00UT. Pointing and focus on Uranus OK. Skydip. calib_1scan. COSMOS started at 22:30UT. tau225~0.28 slowly improving to 0.17. El>35deg. p2p<~4Jy/b@2mm on all the hourly pointings. The COSMOS timelines did however show larger variations +-5 up to 20Jy/b. 12 scans done.
Jan. 25th, Wednesday
03-09: FXD: 2 hours on COSMOS. I did focus in between. Best is 18x19 arcsec at 2mm. p2p variations are well below +-3 Jy/b on pointing scans. Tau=0.2 stable. -10 degC. Cloudy.
Jan. 26th, Thursday
Jan. 27th, Friday
Jan. 28th, Saturday
Jan. 29th, Sunday
Jan. 30th, Monday