Ca Mello 27/7/24 (44.8908819,12.3968578)
SQM 20.5 to 20.75. AOD 0.15-0.20. Temperature 24-22°C. Humidity absent. Mosquitoes few and kept at bay with repellents.
Sumerian 10” Dobsonian. Night Vision PVS-14 with Photonis FOM 2000 tube.
NGC 6334, Cat's Paw Nebula. The five main footprints are seen with an H-alpha filter, Pentax 40 mm, Paracorr, and night vision. The object is 8° high, just above the horizon. Also seen is the dark nebula between the two northernmost footprints and the darker, sharper division of the northwest footprint. SQM 20.50: It is not yet astronomical darkness, and in the direction I am looking, there are the lights of the Marina restaurant.
The view is better than that with a 20" dobson from Tivoli Farm http://www.deepsky-d...34-2/dsdlang/fr
NGC 6357, Lobster Nebula. With an H-alpha filter, Pentax 40 mm, Paracorr, and night vision, you can see the bright central part next to Prismis 24, which is very bright (would be worth trying at higher magnifications) and, with difficulty, the two claws. The sky is shining in that direction, though. The view is better than that with a 20" dobson from Tivoli Farm, which shows only a flare for the brightest part: http://www.deepsky-d...s-24/dsdlang/fr
M 20. With Pentax 40 mm, Paracorr, and night vision, I can see the reflection part as well with the UHC-S filter. All in all, the nebula is very bright, and you can clearly see the dark nebulae. In contrast, with an H-alpha filter, the contrast increases, but overall, the most pleasing image is the one with the UHC-S filter. The dark nebulae are pretty similar to those with the 25" French telescope http://www.deepsky-d...-020/dsdlang/fr. However, the reflection part could be clearer.
M 8, Laguna. With Pentax 40 mm, Paracorr, and night viewer. With the H-alpha filter, you can see much more nebula extension than the UHC-S filter. However, the image looks better with the UHC-S filter. With the latter, the visible part is similar to 25" in the drawing: http://www.deepsky-d...m-21/dsdlang/fr (with more shades of intensity).
IC 4685, emission nebula near Laguna. With UHC-S filter, Pentax 40 mm, Paracorr and night viewer, it is visible without detail. It could be better visible with H-alpha.
NGC 6544, globular just below the Lagoon. With the UHC-S filter, Pentax 40 mm, Paracorr, and night viewer, it is already resolved into stars. With Zoom to 24 mm and no filter, the globular is resolved well. Increasing the magnification further improves star resolution. The cluster has an interesting alignment of arched stars. https://theskylive.c.../ngc6544-object
SQM 20.73, 23°C.
NGC 6818, Little Gem. Planetary nebula: zoomed in at 12 mm (120x), NV, without filters, looks like a little ring and seems to guess a less bright central part. In this case, the view is inferior to 20-25", which has reached much higher magnifications. http://www.deepsky-d...6818/dsdlang/fr
NGC 7009, Saturn nebula. Planetary nebula, zoomed in at 12 and 16 mm (90-120x), NV, without filters, looks like a small Saturn because there is a slightly brighter central ball and ring-like rings, with the two less bright loops in between. In this case, the view is inferior to 20-25", which has reached much higher magnifications. http://www.deepsky-d...7009/dsdlang/fr
Edited by Mauro Da Lio, 28 July 2024 - 05:08 PM.
