Daily Reports

Because of the pandemic, no observers can come to the telescope. This pool is entirely in remote mode.

Jan 12th, Tuesday

16h - 21h; Bilal, Angel: Started about 15h (UT); tau(225GHz)~0.15, stable conditions. One beammap (s161: tau~0.13; El.~41 deg.) & calib1scan on Uranus. Pointing & calib1scan on secondary calibrators (MWC349, CRL2688, NGC7027) and 2251+158. Target tmc1-cp (project 096-20) observed for 1.5h. Project finished.

21h - 03h; Angelos, Suzanne, Hélène: Calibrations done: focus twice and skydip once. Atmospheric conditions: tau between ~ 0.12 and 0.17, stable pointing corrections and beams (2mm FWHM ~ 18"), relatively small sky fluctuations. Observed sources (program 160-16): NGC925 (8 scans, ~ 177 min), NGC2976 (6 scans, ~ 49 min), and NGC5194 (2 scans, ~ 48 min). We lost about 1h15 at the beginning of the shift because of a difficult setup of all the needed windows. Initially, they were split up between VNC 30 and VNC 32, which is not practical when observing remotely with a tiny laptop screen. Many thanks for the help received in the process of setting everything up nicely on VNC 32! We also lost time when switching to the pointing quasar for our last source, and back, because of the azimuth limits. Will know better next time.

Jan 13th, Wednesday

03h - 09h; Longji: The observation started at 3:20 LT when the last scan of the previous shift was completed. I first observed COSMOS until 5:45 LT. After doing focus on 0851+202, I switched to GOODS-N until the end of the shift. The pointing was checked every 1 hour. The weather was clear and tau values were around 0.15 during the shift.

09h - 15h; Jean-François: Observed GASTON 122-16_dust sources (top priority source L1689b) for 3 hours and then GASTON 122-16_GP (cycling thru the 3 sources) for 1 hour. Excellent weather through the run. Only issue: focusing was difficult at 13h (LT). It took a source away from the sun to succeed. The telescope had been observing the whole morning at about 30 deg from the sun.

15h - 21h; Angel: Continuing on GP_L24p5 of GASTON, and then 1 rep. on GP_L23p9. Point and focus on Uranus + 2 skydips. After ~1.5h the antenna was relaxed enough to obtain beam sizes of 12.8" at 1.3 mm and 18.5" at 2 mm. Changing to project 183-20 at ~17h UT. A total of 10 rounds (~2.5h) gathered on MOO0319. Tau below 0.21 and quite a stable atmosphere during the shift.

21h - 03h; Angelos, Suzanne, Hélène: about calibrations, focus three times (-0.44, -0.13, and -0.40) and skydip once. Atmospheric conditions: tau between ~ 0.22 and 0.3, stable pointing corrections and beams (2mm FWHM ~ 18"), acceptable sky fluctuations. Observed sources (160-16): NGC925 (10 scans, ~ 148 min) and NGC2146 (14 scans, ~ 123 min). This time, everything went smoothly, but opacities rose steadily, with occasional little peaks. As far as we can tell, the atmosphere was stable enough. However, at some point, PIIC stopped reducing the 1mm data (but kept producing results at 2mm). We also had trouble finding suitable programs for opacities ~ 0.3 at the end of the shift. Note: for once, the taumeter measurements are not in line with the predictions. Usually, they are in very good agreement. We realized too late that a beammap was needed, i.e. when Uranus was getting low. We'll do it next night, if possible, unless it's done before.

Jan 14th, Thursday

03h - 09h;

09h - 15h;

15h - 21h;

21h - 03h;

Jan 15th, Friday

03h - 09h;

09h - 15h;

15h - 21h;

21h - 03h;

Jan 16th, Saturday

03h - 09h;

09h - 15h;

15h - 21h;

21h - 03h;

Jan 17th, Sunday

03h - 09h;

09h - 15h;

15h - 21h;

21h - 03h;

Jan 18th, Monday

03h - 09h;

09h - 15h;

15h - 21h;

21h - 03h;

Jan 19th, Tuesday

03h - 09h;

09h - 10h;