Southern Neighborhood of Christmas Tree Cluster (Rosette Neb) (David McClain)

Celestial hemisphere: Northern · Constellation: Monoceros (Mon) · Contains: Christmas Tree cluster · Cone nebula · IC 2169 · IC 448 · NGC 2239 · NGC 2244 · NGC 2251 · NGC 2252 · NGC 2264 · Rosette nebula · The star 12Mon · The star 13Mon · The star 15Mon · The star 16Mon · The star εMon

Southern Neighborhood of Christmas Tree Cluster (Rosette Neb), David McClain

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Southern Neighborhood of Christmas Tree Cluster (Rosette Neb)

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Southern Neighborhood of Christmas Tree Cluster (Rosette Neb)

Old data, newly processed with Drizzle integration. 22 frames at F:5.6

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Rev C - I found that by softening the nebular features in my extracted luminosity image, just ahead of star mask creation, allows for much cleaner star mask creation. I do that with HDRMT on the grayscale image after histogram stretching, using a scale length of 3. Thereafter I use the usual MLT transforms to extract the star mask.

I use that star mask back on the grayscale linear luminosity image, then use iterated morphological selection to diminish field stars. Then that diminished luminosity image is re-stretched to nonlinear to become the luminosity channel of the stretched color image.

That accomplishes two things: (A) by eroding stars in the linear domain, the steep wings of the star profiles do a much better job of diminishing field stars, and (B) by eroding only the luminosity channel I leave the colors of the original stars intact in the stretched color image.

I find that the slight improvement made during star mask creation, dramatically reduces the residual fogging that accompanies field star reduction. Much of the cloudy mottling in the background of prior images is directly attributable to that residual fogging, caused largely by the median mixing of close star pairs.

Original
B
Final
C

B

Description: A little HDRMT + re-stretch to bring out more details in the nebula

Uploaded: ...

C

Description: Slight improvement to star mask creation increases image credibility dramatically!

Uploaded: ...

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Astrometry.net job	1357707
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Southern Neighborhood of Christmas Tree Cluster (Rosette Neb)

Southern Neighborhood of Christmas Tree Cluster (Rosette Neb)

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Image Index:

Contribution Index (beta):

Southern Neighborhood of Christmas Tree Cluster (Rosette Neb)

Southern Neighborhood of Christmas Tree Cluster (Rosette Neb)

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Acquisition details

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Revisions

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C

Sky plot

Histogram

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