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Technical card

Imaging telescope or lens: Takahashi TOA-130

Imaging camera: Starlight Xpress H694 Mono CCD

Mount: Astro-Physics Mach 1 GTO

Guiding telescope or lens: Takahashi TOA-130

Guiding camera: Starlight Xpress Lodestar

Filters: Baader OIIIBaader SII

Resolution: 2620x2035

Dates: May 1, 2014May 9, 2014

Frames:
Baader Ha: 6x1200" -10C bin 1x1
Baader OIII: 17x1200" bin 1x1
Baader SII: 27x1200" -10C bin 1x1

Integration: 16.7 hours

Darks: ~50

Flats: ~20

Bias: ~50

Avg. Moon age: 5.40 days

Avg. Moon phase: 35.42%

Astrometry.net job: 278711

RA center: 303.002 degrees

DEC center: 38.418 degrees

Orientation: 90.525 degrees

Field radius: 0.567 degrees

Locations: San Jose, CA, San Jose, California, United States

Description

250,000 - 400,000 years ago, the star in the middle of this Crescent Nebula (number HD192163) turned into a red giant. As a result, the star expanded rapidly, burned hotter and shed lots of material. Later, it became a so-called Wolf Rayet star burning even hotter and shedding more material faster. The Crescent nebula is from the area where the second, faster wave hits the first, slightly slower wave. The interaction of the two waves makes the material glow.

What's even more exciting, this star will become a supernova - we just don't know when. Also, because of its distance of 5000 light years, the supernova might have already happened. We just haven't seen it yet.

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Author

Mark Striebeck
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Crescent Nebula, Mark Striebeck