Yesterday I took the opportunity of a weather gap in the Casera Razzo area for a short observing session (from astronomical darkness until about 2 a.m.).
Sumerian 10" Dobson. NV Alpha Photonics PVS14 FOM 2000.
The Sumerian fits in the car in one piece, so mounting and dismounting takes literally seconds.
Place of observations is the usual scenic pad before the descents to Sauris (
SQM 21.5 averaged over the VL (standard SQM). I would have liked to make objects to the south but the transparency was not great (extinction of 0.2 AOD). This was my first time using in new NV under a ~21.5 sky.
Temperature 14°C. Abundant humidity. Passing cars: one all night. Cows 2, deer 3. Alien and terrorist dobsonary hunters zero.
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NGC 6528 and 6522. Two globulars that with 30 mm (42x) glass can be seen only as a flare. With image intensifier between 16 and 12 mm they resolve discreetly into stars.
NGC 6522 is no larger than 28, although on the map it looks like it is.
CB 107. The inkblot can be seen (with NV) with fair detail, but not much contrast because the sky is clear in that direction. With the IDAS LPS filter it does not improve much.
SQM 21.45.
M 51 with the IR-cut filter is seen a little more detached from the sky background (with NV), but it is dark. Without filter it is much brighter. However, the sky is also bright and so contrast is not very high. You can follow the spirals.
SQM 21.50
NGC 6781 (with NV, Pentax 40) without filters is a small disk not very contrasty compared to the sky background. With UHC-S it becomes a doughnut. With the 24 mm without filters it is a little pale compared to the sky background. With the UHC-S filter it all becomes a little too dark. A 30 mm would be needed.
NG 6804 is overlaid with three small stars. With UHC-S filter you can see it. It is always a little difficult to distinguish it from the small stars, though.
M 27 the aesthetically best result is with IR-cut filter.
NGC 6891 is practically point-like: a small star with a small halo around it (8mm 156x).
Translated with DeepL.com (free version)
