M27 - Dumbbell Nebula (Tim Hutchison)

Celestial hemisphere: Northern · Constellation: Vulpecula (Vul) · Contains: 14 Vul · Dumbbell Nebula · M 27 · NGC 6853 · PK060-03.1 · The star 14Vul

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M27 - Dumbbell Nebula

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M27 - Dumbbell Nebula

This was my first attempt at this object, as well as my first attempt at adding RGB stars to an HOO image. It was a lot more difficult than I thought it would be to get right. I'm still not very happy with my result, but I don't think it's going to get much better without more data... So here it is in all it's mediocrity. LOL

EDIT: I went back and reworked the image (Rev B.) and I was able to improve on the result without adding more data. I used a different method to drop in the stars. Basically, I removed the stars as best as I could from the NB image and then overlayed the stars with PixelMath using a "PhotoShop-like" screen blend. Here is the process for anyone that is interested:

Use DSOMask script to create a star mask

Invert the mask

Clip the shadows on the mask

Apply star mask to NB

Perform the following on NB image:

MorphologicalTransform - Erosion - Iterations 5, Amount 1

MorphologicalTransform - Erosion - Iterations 5, Amount 0.5

MorphologicalTransform - Erosion - Iterations 5, Amount 0.25

MultiscaleMedianTransform - Layers 6, turn off all layers leaving only residual, apply twice

Convolution, stddev=30

Convolution, stddev=90

NB is now starless

PixelMath: formula ~(~RGB * ~NB)

- apply to the NB image WITH THE STAR MASK IN PLACE and replace the image. The mask will only be honored if you replace the original NB image.

That's it.

Thank you to Barry Wilson for originally publishing this technique for removing the stars.

Original
Final
B

B

Description: I wasn't happy with the way that the RGB stars were looking in this image, so I went back and reworked it. I think this is a much better result.

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Status	Advanced success
Started	...
Astrometry.net job	3656462
PixInsight job	QR8M1DH09194SDF0PNM8Y68CDE74FA6R
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	19h59m32s.86
RA (top/left)	20h03m39s.74
RA (top/right)	19h55m01s.19
RA (bottom/right)	19h55m28s.68
RA (bottom/left)	20h04m02s.22

Dec (center)	+22°43′10″.3
Dec (top/left)	+23°26′35″.4
Dec (top/right)	+23°17′51″.6
Dec (bottom/right)	+21°59′21″.8
Dec (bottom/left)	+22°08′10″.4

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M27 - Dumbbell Nebula

M27 - Dumbbell Nebula

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