A massive star formation region NGC 6188 [1], also called the Rim nebula in the constellation Ara that also forms the “upper jaw” of one of the “dragons” in large formation often recognized as “Fighting Dragons of Ara”, located at a distance of about 1300 pc. The Rim nebula is a shock front caused by the intense UV radiation from a nearby Ara OB1a association and its core part - NGC 6193 (Caldwell 82) open star cluster at the distance of about 1155 pc (sitting outside of the FOV of this particular image at the top side). Visible in the higher optical density part of the nebula (behind the rim on the right side of the image) is the RCW 108 IR star cluster (not to be confused with RCW 108 which is yet another name for NGC 6188) - a young, compact cluster partially embedded in its parent molecular cloud [2].
Data and initial calibration/integration: Alexandr Zaytsev
https://www.astrobin.com/users/m57ring/ASA Ritchey-Chretien RC-1000: D=1m, f/6.8 on alt-azimuthal direct drive fork mount, FLI ProLine 16803 with secondary mirror based motorized focusing and automatic de-rotation (Telescope #1 system of ChileScope observatory, Río Hurtado Valley, Chile).
10x Ha + 10x OIII + 10x SII guided 600 sec exposures (5h of combined integral) collected over 6 imaging sessions carried out on Jun 8, 9, 10 of 2022, Jul 17, 31 of 2022, and Aug 1, 2022 using Chilescope Telescope #1 system.
Image Processing: Mark Hanson
www.hansonastronomy.comEnjoy, Mark and Alex
[1]
http://galaxymap.org/cat/view/rcw/108[2]
https://arxiv.org/pdf/0712.3005.pdf
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