The Dumbbell Nebula - M27 (Corey Rueckheim)

Celestial hemisphere: Northern · Constellation: Vulpecula (Vul) · Contains: DQ Vul · Dumbbell nebula · M 27 · NGC 6853 · PK060-03.1 · TYC2141-1010-1 · TYC2141-1064-1 · TYC2141-107-1 · TYC2141-1086-1 · TYC2141-1110-1 · TYC2141-1146-1 · TYC2141-1318-1 · TYC2141-1400-1 · TYC2141-1550-1 · TYC2141-1650-1 · TYC2141-1734-1 · TYC2141-257-1 · TYC2141-688-1 · TYC2141-922-1 · TYC2141-926-1 · V0418 Vul · V0498 Vul · V0571 Vul

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The Dumbbell Nebula - M27

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The Dumbbell Nebula - M27

This is an image of the Dumbbell Nebula, Messier 27. Can you find the Goldilocks Variable? To find it, look for the brightest star just inside the lower-right rim of the nebula. The Goldilocks Variable is the next star in towards the center of the nebula. The two stars for an obvious right triangle with a third star, and another fainter but similar right triangle lies just below it tilted just slightly counter-clockwise. Leos Ondra discovered the variability of this star in 1988 by noticing that it was visible in some images, but not in others. It is easily visible here in my image, indicating that it is probably near peak brightness. It is a Mira-type variable star with a period of approximately 213 days. Mira variables are very large, bright stars, so this one must lie far beyond the Dumbbell Nebula, shining through the nebula's thin gases. North is to the right in this image.

I have widely read that you shouldn't oversample the sky (small arcsec/pixel), and this camera at full resolution on my telescope is very oversampled. But to test it for myself, I took an image of this object at full resolution, another binned at 2x, and a third binned at 4x. The one binned at 4x was terrible. The one binned at 2x looked very good, but the full resolution image looked better - it wasn't a huge difference, but enough to matter to me. However, at full resolution, the stars cover so many pixels that I have trouble getting stacking software to align multiple exposures using them.

Central USA

Messier Objects
Planetary Nebulae
ж― 2019-09-06 ―ж Lafayette Home

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Status	Advanced success
Started	...
Astrometry.net job	3065392
PixInsight job	LPBQUWUDEK0U5VMCDFDQ6GD0P2GNZIV0
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	19h59m41s.159
RA (top/left)	20h00m16s.779
RA (top/right)	20h00m09s.720
RA (bottom/right)	19h59m05s.438
RA (bottom/left)	19h59m13s.297

Dec (center)	+22°42′38″.79
Dec (top/left)	+22°32′22″.48
Dec (top/right)	+22°54′07″.60
Dec (bottom/right)	+22°52′54″.10
Dec (bottom/left)	+22°31′09″.90

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The Dumbbell Nebula - M27

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