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I agreeImaging telescope or lens:Takahashi TOA-130
Imaging camera:QHYCCD QHY 22
Mount:Takahashi EM-200
Guiding telescope or lens:Takahashi TOA-130
Guiding camera:QHY5L-II Mono
Focal reducer:Takahashi TOA Reducer at F/5.5
Software:photoshop, PHD guiding, APT - Astro Photography Tool, PixInsight PixInsinght 1.8 RC7
Filters:Baader Planetarium OIII 8.5nm 2", Baader Planetarium Ha 7nm 2"
Accessories:Brightstar Quantum Electronic Filter Wheel 7x2", Brightstar Advanced OAG
Resolution: 2043x1600
Dates:July 28, 2017, July 29, 2017, July 30, 2017
Frames:
Baader Planetarium Ha 7nm 2": 14x900" -25C bin 1x1
Baader Planetarium OIII 8.5nm 2": 15x900" -25C bin 1x1
Integration: 7.2 hours
Avg. Moon age: 6.32 days
Avg. Moon phase: 38.97%
Astrometry.net job: 1767610
RA center: 302.561 degrees
DEC center: 36.174 degrees
Pixel scale: 1.772 arcsec/pixel
Orientation: 154.229 degrees
Field radius: 0.639 degrees
Locations: Nedelkovo, near Sofia, Bulgaria
Data source: Backyard
The star Wolf-Rayet 134 (the brightest star near the image center) is very hot star with temperature over 63,000 K and luminosity around 400,000 times than the Sun. Its radiation and very powerful winds are the reason to form the ring shaped nebula in the mix of stellar matter and surrounding gas. Wolf-Rayet stars loose huge part of their mass in stellar winds...
WR 134 is one of the first three stars with unusual emission lines in the spectrum which lead to creation of new stars class - Wolf-Rayet stars.
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