Abell 71 - Sh2-116 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: PK085+04.1 · Sh2-116

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Abell 71 - Sh2-116

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Abell 71 - Sh2-116

This object, also known as Pk 85+04.1, is a faint nebula located 2400 light years away in the constellation of Cygnus at a declination of +47 degrees. The nebula spans 3 arc-minutes in our apparent view, which corresponds to a diameter of 2 light years.

Not much has been written about this object. The big question is - what is it? It was classified as a planetary nebula by Abell. I imaged a very faint OIII signal for this nebula, but because it is so faint, most doubt now whether it truly is a planetary nebula.

A paper by Pismis, Hasse and Quintero in 1991 identified this object as simply a region of HII gas. But I have imaged many circular regions of Ha gas, and none look like this nebula. The nebula has a bit of a spiral shape, similar to a galaxy, with arms seen at the top and bottom.

Even more intriguing to me about this object is that I see a very, very faint bluish central star in my image, at the exact center of the nebula. Examining the image in detail, I do not think this is an artifact or an accident.

Because of the faint central star and the faint OIII signal, plus the unique "spiral" nature of this nebula, I think there is more to it than simply being an HII region. The object begs further study by experts to identify its morphology.

The faint nebulosity surrounding Abell 71 is part of SH2-115.

Narrowband imaging
Takahashi Refractors
Sharpless2 Objects
Planetary Nebulae
ZWO ASI183/QHY183
Abell Planetary Nebula
The refractors!
Cloudy Nights

Abell PN Catalog (Complete)
All of My PN Images (264)
HII-Dominated Nebulae
PN Point Symmetric Jets
Sharpless Catalog (200/313)
Small Packages Catalog (Complete)

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Distribution of astrophotographers

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	Distinct awarded users	Total awarded images
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	Image of the day	Top pick	Top pick nominations	Total submitted
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Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	3020449
PixInsight job	7DIITUM1SWZJMHENZJSE0M3QT0H9J052
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h32m23s.885
RA (top/left)	20h34m07s.126
RA (top/right)	20h31m25s.810
RA (bottom/right)	20h30m40s.850
RA (bottom/left)	20h33m22s.108

Dec (center)	+47°20′54″.73
Dec (top/left)	+47°24′30″.79
Dec (top/right)	+47°35′44″.25
Dec (bottom/right)	+47°17′12″.67
Dec (bottom/left)	+47°06′03″.18

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Abell 71 - Sh2-116

Abell 71 - Sh2-116

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Abell 71 - Sh2-116

Abell 71 - Sh2-116

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