The Egg Nebula - Protoplanetary nebula (StarDiver)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg)

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The Egg Nebula - Protoplanetary nebula

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The Egg Nebula - Protoplanetary nebula

Many people, including myself, probably had no idea that such a type of nebula exists—it's a brief intermediate stage between the final phase of a star's evolution as it transitions into a white dwarf and the formation of a planetary nebula. This stage lasts about 10,000 years.

The Egg Nebula (also known as RAFGL 2688 and CRL 2688) is a bipolar protoplanetary nebula approximately 3,000 light-years away from Earth. Its peculiar properties were first described in 1975 using data from the 11 μm survey obtained with sounding rocket by Air Force Geophysical Laboratory (AFGL) in 1971 to 1974. (Previously, the object was catalogued by Fritz Zwicky as a pair of galaxies.)
The Egg Nebula's defining feature is the series of bright arcs and circles surrounding the central star. A dense layer of gas and dusts enshrouds the central star, blocking its direct light from our view. However, the light from the central star penetrates the thinner regions of this dusty enclosure,illuminating the outer layers of gas to create the arcs.
The dusty enclosure around the central star is very likely a disc. The bipolar outflows in the image indicate that the system has angular momentum, which is very likely generated by an accretion disc. In addition, a disc geometry would account for the varying thickness of the enclosure that allows light to escape along the disc's axis and illuminate the outer layers of gas, but still blocks it from our direct view along the disc edge.

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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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	Image of the day	Top pick	Top pick nominations	Total submitted
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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.

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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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Status	Advanced success
Started	...
PixInsight job	1PP0VLK6W0WQ0MDT5IITUL99LDHBKBN6
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	21h02m18s.727
RA (top/left)	21h02m57s.826
RA (top/right)	21h01m38s.850
RA (bottom/right)	21h01m39s.713
RA (bottom/left)	21h02m59s.320

Dec (center)	+36°41′37″.95
Dec (top/left)	+36°47′05″.90
Dec (top/right)	+36°46′36″.14
Dec (bottom/right)	+36°36′09″.98
Dec (bottom/left)	+36°36′39″.19

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The Egg Nebula - Protoplanetary nebula

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