Ced 211 revisited (lowenthalm)

Celestial hemisphere: Southern · Constellation: Aquarius (Aqr) · Contains: R Aqr

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Ced 211 revisited

Acquisition type: Lucky imaging

Powered byPixInsight

Ced 211 revisited

Acquisition type: Lucky imaging

Whenever this object (Ced 211, short for Cederblad 211) is near the meridian when I am observing from a dark sky site, I check this object in case low altitude seeing is decent. Its always low in the sky from northern Oregon, so usually the results aren't great. I first posted an image of this object about a year ago, but back in August 2019, I captured some better data and just got back to processing it. Here is the result, which is somewhat better than the last version I posted. I have duplicated my description from my earlier posting below:

"Ced 211 is a very unusual object around the Mira type variable star R Aquarii that despite appearances, is not a planetary nebula. Its apparently created by a white dwarf orbiting the variable and being enveloped by the stars atmosphere during part of the star's 300 day cycle. Material accumulating on the white dwarf then causes recurring novae that eject these glowing gas clouds. According to data on Wikipedia, the last one of these was 190 years ago."

The fuzzy dots are the brighter galaxies in a large and rich galaxy cluster in the distant background that spans the sky behind Ced 211. I wouldn't be surprised if they aren't 2 or 3 billion light years away.

There are hints of structure beyond the bright parts of the nebula, so a deeper image would be worthwhile, however, I have had bad luck obtaining more than one image of this object. Someday I'll get a lot of data on a good observing night so I can stacking a half hour or more of data and produce a deeper image. The nebula evolves over time spans of only a few years, so I will keep an eye on it to watch for changes.

ZWO ASI 294MC PRO
Astrophotography with Dobson

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Bests: Unusual objects
Nebula

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Status	Advanced success
Started	...
Astrometry.net job	3215656
PixInsight job	5I816OM9BG5NJYZSIUE3YY1OQQKWOH7W
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	23h43m49s.980
RA (top/left)	23h44m10s.484
RA (top/right)	23h43m13s.946
RA (bottom/right)	23h43m29s.457
RA (bottom/left)	23h44m26s.200

Dec (center)	-15°17′39″.25
Dec (top/left)	-15°10′09″.40
Dec (top/right)	-15°15′26″.10
Dec (bottom/right)	-15°25′08″.81
Dec (bottom/left)	-15°19′52″.19

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Ced 211 revisited

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Ced 211 revisited

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