Abell 61 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: PK077+14.1

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Abell 61

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Abell 61

This object is a faint planetary nebula located 3000 light years away in the constellation of Cygnus, at a declination of +46 degrees. The nebula is framed by a beautiful star field. Its apparent size to us of 3 arc-minutes corresponds to a true diameter of about 3 light years. The central 17th magnitude variable star (WD1917+461) is plainly visible in the center of the nebula. The OIII signal is much stronger than Ha for this nebula.

The most interesting aspect of this object to me is the faint thin rim around the outside edge of the top half of the nebula. The rim is not present on the lower half. A 1994 paper (The Ionization Structure of Old Planetary Nebulae which Interact with the Interstellar Medium, Tweedy and Kwitter) indicates that this effect is due to interaction with the ISM. Some subtle structure is visible on the inside of the nebula, including what looks like the start of a more transparent region in the central region of the nebula.

Several other PN I have imaged have a similar structure (Strong OIII signal with a rim and a more transparent section in the central region), most notably Abell 39 and Jones 1. However, these other nebulae do not show the same non-symmetric ISM impact as this object.

Narrowband imaging
Takahashi Refractors
Abell Planetary Nebula
The refractors!
Cloudy Nights
ZWO ASI1600MM/QHY163M
Planetary Nebulae

Abell PN Catalog (Complete)
All of My PN Images (264)

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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.
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Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
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Status	Advanced success
Started	...
Astrometry.net job	2838883
PixInsight job	62KSGTVLC7QIK8U0PRCFKP6TEFAGN5C9
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	19h19m10s.872
RA (top/left)	19h18m56s.808
RA (top/right)	19h17m19s.412
RA (bottom/right)	19h19m24s.756
RA (bottom/left)	19h21m02s.801

Dec (center)	+46°14′50″.38
Dec (top/left)	+46°35′10″.34
Dec (top/right)	+46°07′58″.36
Dec (bottom/right)	+45°54′30″.26
Dec (bottom/left)	+46°21′35″.35

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Abell 61

Abell 61

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