SH2-216 Planetary Nebula (rdhand)

Celestial hemisphere: Northern · Constellation: Perseus (Per) · Contains: HD28772 · HD29093 · HD29203 · HD29818 · HD29900 · HD29997 · LBN 742 · LBN 744 · PK158+00.1 · Sh2-216

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SH2-216 Planetary Nebula

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SH2-216 Planetary Nebula

Photos were taken on 19, 20 and 24th of Oct 2022.

Sh2-216 is the largest planetary nebula at about 3X as wide as the full moon as seen from earth. The nebula is old for a planetary nebula at 500,000 years. This type of nebula fades away as the ball of gas spreads. The old age explains its size and dimness. It's also the second closest planetary nebula to Earth at about 400 light-years distant. The planetary nebula is very diffuse on one side with only a hint showing in the photo. Planetary nebulae are formed when stars that are too small to go supernova throw off shells of gas in their dying stages. It leaves behind a small dense white dwarf star. Planetary nebulae have nothing to do with planets. Early astronomers mis-named them because of the circular shape. This photo took 13.6 hours of exposure time.

Cloudy Nights

Planetary Nebula

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	Distinct awarded users	Total awarded images
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Deep sky
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	Image of the day	Top pick	Top pick nominations	Total submitted
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Other
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	6473900
PixInsight job	ID75U4OFTCMM60ZX9JVTH6UBGHZ6OK8V
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	04h41m39s.15
RA (top/left)	04h33m15s.39
RA (top/right)	04h46m00s.18
RA (bottom/right)	04h50m25s.54
RA (bottom/left)	04h37m03s.40

Dec (center)	+46°42′08″.6
Dec (top/left)	+45°30′49″.5
Dec (top/right)	+44°58′45″.4
Dec (bottom/right)	+47°51′03″.4
Dec (bottom/left)	+48°24′41″.5

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SH2-216 Planetary Nebula

SH2-216 Planetary Nebula

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SH2-216 Planetary Nebula

SH2-216 Planetary Nebula

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