Bubble Nebula in RGB (David McClain)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: Bubble nebula · M 52 · NGC 7538 · NGC 7635 · NGC 7654

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Bubble Nebula in RGB

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Bubble Nebula in RGB

Whew! This one was a real challenge because of the proximity of extremely bright stars next to a subtle nebula that needed to be enhanced. Pull out all stops on masking with PI to keep those stars from ruining the image as they go into full saturation.

This is the limit of what my backyard allows, having nearly 7 arcsec seeing on the red brick patio after heating in the direct Tucson sunlight all day long. But it was worth it for comparison with the SHO data from Rowe, NM at DSW Remote Observatory.

.. there is one advantage to having "poor seeing". With the quality of the Paramount MyT I don't need to do any guiding for exposures like these. At this declination, I could even go longer, if it weren't for the strong sky background. I probably have no more than about 0.6 pixel drift in these exposures over 180 sec. And my pixels are 1.79 arcsec. So that's about 1/2 arcsec / min drift, at the Equator, in the Paramount. With stars averaging around 7 arcsec FWHM, that's in the noise.

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Rev D: Improved field star reduction.

Original
B
C
Final
D

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	Image of the day	Top pick	Top pick nominations	Total submitted
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Mix of multiple sources
Other
Unknown

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Status	Basic success
Started	...
Astrometry.net job	1291691
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Bubble Nebula in RGB

Bubble Nebula in RGB

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Bubble Nebula in RGB

Bubble Nebula in RGB

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