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Daily Reports
Because of COVID-19, only IRAM staff is allowed to observe on-site until new notice.
Contents
Nov 23rd, Tuesday
We successfully arrived at the telescope with the first winter transport of the season.
Afternoon shift (16:00-21:00; Ioannis + Stefano): we try to focus but the sky is highly variable. We give up and stop when the peak-to-peak variations in the timeline of pointings reach 400 Jy/beam (four hundred). We're now immersed in the clouds. Temperature -9 Celsius; humidity 100%, wind ~10 m/s.
Today's journey to the stars:
First half of the night shift (21:00-03:00; Stefano and Juan): fog, snow and wind. The telescope is parked. The de-icing is on. At roughly midnight (CET) the wind calms down and it is not snowing anymore. It seems that the fog might also disappear soon. At 00:22 CET the sky is clear and the telescope moves out of the parking position. We now need to wait a bit until the primary surface relaxes after the de-icing. Frederic goes up on the platform to remove some snow and ice from the subreflector. After the usual pointing/focus, we switch to 010-21 and we observe 3 repetitions of NGC1333-C2, thus reaching a total of 17 repetitions and 5h40m in total on this source (total time requested 7h per target). Tau(225)~0.20-0.30. Calib_1scan on Uranus (20211124s21)
Nov 24th, Wednesday
03:00 - 09:00, Longji: The shift started with the observation on 010-21. After 1-hour observations, a new focus and a skydip (20211124s40), I switched to N2CLS(192-16) with tau~0.27. The weather degraded quickly in less than 1 hour and I stopped the observation. I switched to 045-21 from 6:30am CET. A new focus was made at the end of the shift but we have elliptical beam at 1mm even at the best focus returned.
09:00 - 15:00, Ioannis & Carsten: tau~0.37, +/-5Jy: 2 scans on NGC3938 (IMEGIN), Switching to 086-21 (ARSENAL, 1xrepetition). Entering into clouds and becoming much more instable. Switched to EMIR backup 015-21. Mars peak temperature varies by >50%. Stop.
15:00 - 21:00, Andrew (remote): The telescope has remained in fog throughout this shift. I didn't enter a single command into Pako. Better luck to the next shifts... :*-(
21:00 - 03:00, Stefano & Laurence: Bad weather and telescope parked throughout the shift.
All we could observe today...
Nov 25th, Thursday
03:00 - 09:00, Alex waking up, bad weather telescope in park in the fog, waiting for clear skies. 07:20, Sky is clearing up, no instruction on what to observe (wrong email address) so doing a focus on 1226+023 to proceed on 192-6... tau at 0.17. Took some time to get a proper focus (mostly in my brain)
09:00 - 15:00, Carsten & Ioannis. tau~0.25-0.3 stable. Clear sky, some highy ice clouds. Doing 084-21. Source at ~30deg from the sun. +-5Jy at 2mm. calib_1scan #75 on Mars. Skydip #76. Continuing on 084-21 until thick clouds rise leading to +-20Jy and more of instability. Stopped.
Our favorite telescope observing mapping the Galactic plane for GASTON...
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Nov 26th, Friday
Nov 27th, Saturday
Nov 28th, Sunday
Nov 29th, Monday