NGC 2237 - Rosette Nebula (Paul Ricker)

Celestial hemisphere: Northern · Constellation: Monoceros (Mon) · Contains: 12 Mon · NGC 2237 · NGC 2238 · NGC 2239 · NGC 2244 · NGC 2246 · Rosette A · Rosette B · Rosette Nebula · Sh2-275 · The star 12Mon

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NGC 2237 - Rosette Nebula

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NGC 2237 - Rosette Nebula

The Rosette Nebula, NGC 2237 (and assorted other NGC numbers). An HII region in the Monoceros molecular cloud whose center has been evacuated by the open cluster NGC 2244.

Used about 1 1/2 hours of LRGB data from a trip to the Everglades last year and 2 hours of Halpha from home this month to make an L(HaR)GB image, blended with a version in which I had regularized the bright stars with StarTools, and then used the processed Halpha data to blend 50% luminosity.

I often get strange stars with this scope, especially in cold weather. They will show an "iron cross" 4-point diffraction pattern, and sometimes they are elliptical and tilted. Not a tracking issue, I think, since it occurs even when tracking is good. I've tried backing off the forward collimation screws and stopping down the aperture a few millimeters, and that helps with the cold weather issue, but not the stretching. So for some images with this scope I first make a processed version of the image, then use the Repair function in StarTools to redistribute each star into a Gaussian (?) shape. This makes stars that look a little too perfect, so I blend it with the original processed image. The result looks better than what I am able to achieve with deconvolution. Ultimately it's a hardware issue of some kind, of course -- perhaps focuser tilt?

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Status	Advanced success
Started	...
Astrometry.net job	4017645
PixInsight job	FIRQ47RBI9RWFVACE3640EGVO3NFYDZY
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	06h32m03s.47
RA (top/left)	06h34m02s.10
RA (top/right)	06h28m45s.13
RA (bottom/right)	06h30m04s.34
RA (bottom/left)	06h35m21s.22

Dec (center)	+04°58′33″.1
Dec (top/left)	+05°41′10″.0
Dec (top/right)	+05°14′48″.8
Dec (bottom/right)	+04°15′53″.4
Dec (bottom/left)	+04°42′15″.7

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NGC 2237 - Rosette Nebula

NGC 2237 - Rosette Nebula

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