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Thursday, January 15, 2009

Sh2-240, a Supernova remnant. (Simeis 147)

I have never seen this object in HST narrowband colors.
After strucling with this last night, I don't wonder why.
This is a extremely difficult objekt it has a super low surface brightness and
it's huge!
This is a supernova remant in Taurus & Auriga it has the angular diameter of 200'x180'. Thats about 8 full Moon!
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There was very litle data on O-III channel.
With extreme stretching and by using the method I have developed for narrowband work, some O-III glow can be clearly be seen deep down in data.
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Total exposure time was relatively short doe the very fasr f1.8 optics.
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Exposures:
-H-alpha 12x600s binned 1x1+ 24x300s binned 2x2, total 4h
-S-II 5x600s binned 2x2
-O-III 14x300s binned 3x3
Optics:
Canon 200mm EF f1.8 @ f1.8
Camera:
QHY9 @ -50 C
Guiding:
Lx200 GPS 12" + LQHY5 and PHD-Guiding
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The information in O-III channel is extremely weak.
I used a special technique of mine to dig it out for color information.
This image serie shows how weak the O-III realy is.
Here is a Starless version to better show the nebulosity.
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I keep coming back to this fascinating object, there is something mysterious
about its appearance and the fact, that it's difficult to shoot makes it even more interesting.
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Here is some elaier tryouts with Sh2-240:

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