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Heart Nebula IC 1805 in Cassiopeia

Started by Rob Mackie, 09/04/2007 07:52PM

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Posted 09/04/2007 07:52PM Opening Post

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Image acquired using the Baader 7nm HA filter in STL 11000 camera on an AP 130 @ F/4.5.
Total exposure time was 180 minutes via twelve 15 minute sub exposures.
Seeing was good, with FWHM = 1.8. http://www.pbase.com/steelnavy/image/84976062/large

Full size: http://www.pbase.com/steelnavy/image/84976062/original

Rob Mackie

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Posted 09/04/2007 08:44PM #1

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Very nice, Rob! Great details! I do see some black "pepper" specks in parts of the nebula. Either cold pixels or perhaps warm pixels or otherwise in the dark frames. How many darks do you have? How do you create your master dark? I used to have those "pepper" specks myself, but a median-combined master dark got rid of them.

HTH,
Eric

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Posted 09/04/2007 08:48PM #2

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nice job

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clear skies, guys!
Dietmar
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Posted 09/05/2007 12:25AM #3

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Rob Mackie said:
Seeing was good, with FWHM = 1.8.

I haven't seen a FWHM under 2 for months! Nice job!

Tom

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Posted 09/05/2007 01:30AM #4

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Very nice Rob.

Greg.

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Posted 09/05/2007 03:35AM #5

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Looks very good Rob,nicework.

Jason

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Posted 09/05/2007 04:04AM #6

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Very Nice Rob!

I also liked the M8 / M20. That STL11000 does great job with field and resolution.

On the pepper flecks, good darks are certainly needed but I'm not sure darks can do everything - particularly if the stretch is heavy. I think a sigma or median combine on the sufram stack can help even after an imperfect dark subtract.

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Jim Thommes

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Posted 09/08/2007 12:56PM #7

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Simply wonderful! 8)

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Ivan Gastaldo 8)
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Posted 09/08/2007 10:15PM #8

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Sweet shot Rob!

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"The expression of the beautiful is in direct ratio to the power of perception acquired by the artist." (Gustave Courbet)

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Heart Nebula IC 1805 in Cassiopeia

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