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Tonight, the opacity is slowly going under 0.5. We will track as much as possible the project B10, if the opacity stays like that. |
Daily Reports
Oct 7th, Monday
Bilal is at the telescope for preparatory operations.
-- I have a bad feeling about this
Oct 8th, Tuesday
This is the start of the 1st NIKA2 pool of Summer 2019!
Jean-Baptiste, Jean-Paul, Marina, Samantha, and Stefano arrived at the telescope.
And what a start! The instrument is up and running, some problems remains to be identified. We can't start science observation yet because the opacity is above 0.6, but we still take this time to get NIKA2 in prime condition for the weeks to come. The opacity is going down (~0.5), so let's hope for the best tonight!
Night shift (Jean-Baptiste and Stefano + Bilal until ~23 UT)
The sky opacity is above 0.5. We perform some pointing and focus scans and one beam-map for learning standard operations. Then we wait for the sky to get better. Bilal is with us for a while (until ~23 UT). Following the AOD advice, we take some calibration scans after 23 UT, despite the sky opacity is still slightly out of the acceptable range.
A focus sequence taken across midnight UT is affected by the usual "midnight bug". Please check it out again.
At 2 a.m. UT we're still waiting for the opacity to get better, and it actually gets worse... for consolation the moon offers us a never-seen-before show, as she dives into the horizon.
Fotos of the day:
Oct 9th, Wednesday
While the opacity was too bad to observe with NIKA2, Dave continued investigating for the 10Hz spurious noise recently found in the cabin during the afternoon. Nothing was found, and as the evening arrived, we continued working with the instrument.
The opacity slowly drops to 0.5 when arrives the night.
Night shift (Jean-Baptiste and Stefano + Bilal until ~23:30 UT)
"In the cabin", NIKA2 sees the parasite signal, but with these sub-optimal sky conditions the parasite is mostly lost in the sky noise. See the picture below. This tells us that - with these sky conditions (tau>~0.5) the contribution of the parasite to the noise of the data is negligible.
==> Visibly something has changed then, check on September test run; we had similar opacities, and the parasite signal was much more visible in the spectra ! Maybe need to check the absolute value of the spectra level, to be sure whether there's a real change or not. I remember we had spikes at > 105, while here, even below 104 we barely see the spikes... --SL--
We proceed with calibrators and tests on extended sources in poor sky conditions (tau>0.5) until 2:25 UT.
Then we observe Planck point-like sources (positioning and flux monitoring): PCCS2G 156.13 PCCS2G 152.56 PCCS2G 149.61 faint PCCS2G 141.05 PCCS2G 140.55 PCCS2G 142.61 PCCS2G 142.60 PCCS2G 140.37 NGC0891 PCCS2G 140.13
Tonight, the opacity is slowly going under 0.5. We will track as much as possible the project B10, if the opacity stays like that.