A one hour image of this star cluster and huge emission nebula in the southern Milky Way.
I didn’t do my homework properly on this. The nebula was listed as 20′ x 12′, fitting easily into my 1.5° x 1.0° field of view. It seems the cluster may be that size but the nebula is very much bigger, forming part of a much wider region of complex nebulosity which stretched well outside this image.
It was my second target of the evening and unfortunately I failed to recheck the focus, which had become slightly off due to the temperature dropping to sub-zero and ice forming everywhere. 😨
So, not one of my best images but an interesting region.
Designation: NGC6188 (emission nebula); NGC 6193 (open star cluster).
Visual magnitude: +5.2
Apparent size: 20′ x 12′
Diameter: 21.9 light years.
Distance: 3,800 light years.
Altitude during exposure: 53° above SW horizon.
Please feel free to jump to the end and like or comment.
Exposure: 41 x 89.4 sec = 61 min.
Image acquisition: SharpCap.
|Telescope:||SkyWatcher Esprit||Type:||120ED triplet refractor|
|Focal:||840 mm F/7||Mount:||SkyWatcher EQ6-R Pro|
|Camera:||ZWO ASI 071 MC Pro
||Type:||CMOS 28.4mm 16 Mpx
|Optical aids:||Flattener: Y; filter: LP||Guiding:||No|
|Polar aligning:||QHYCCD PoleMaster||Polar Error:||00’ 22”|
[ZWO ASI071MC Pro]
Auto Exp Target Brightness=100
Image © Roger Powell
As a resident of the Northern Hemisphere it’s always strange to hear accounts of freezing temperatures in August. I’m just under +42 latitude and July and August are the main “hot” months here.
I lived at +52 before I moved to -34 and I can still get confused myself.
I think Spring and Autumn are best – less cool but still early enough sunset to get a good session.
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