Fraternal Twins - Sh2-216 & 221 - SHO (Timothy Martin)

Celestial hemisphere: Northern · Constellation: Auriga (Aur) · Contains: B25 · LBN 737 · LBN 742 · LBN 744 · LBN 745 · LBN 747 · LBN 754 · LBN 755 · LBN 759 · LDN 1465 · LDN 1475 · Sh2-216 · Sh2-217 · Sh2-219 · Sh2-221

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Fraternal Twins - Sh2-216 & 221 - SHO

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Fraternal Twins - Sh2-216 & 221 - SHO

This image depicts many phases of stellar birth and death.

Sh2-221 (on the left) is a supernova remnant about 2,600 light years distant that came from a star that exploded approximately 6,000 years ago. It's roughly 130 light years in diameter. The star, which was once much like our sun, that created the planetary nebula Sh2-216 (on the right) started dying its slow death a half million years ago, which makes it ancient by planetary-nebula standards. Sh2-216 is much closer at around 400 light years and is much smaller, at 11 light years in diameter. It's the second-closest known planetary nebula--also the largest and the oldest.

The yellow-orange blob above Sh2-221 is Sh2-217. It's part of a larger star-forming region and contains around 4,100 solar masses of material. The aforementioned star-forming region is very young for such things at only 4 million years old. Sh2-217 is about 13,700 light years away and about 35 light years across at its widest point. Looking like it sits atop Sh2-221's right shoulder, the smaller Sh2-219 is part of the same star-forming region as Sh2-217 and is about the same distance from us. The emission nebula BFS 44/LBN 755 at the bottom of the frame between the two large objects is also part of the same star-forming region.

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	Distinct awarded users	Total awarded images
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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.
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	7087086
PixInsight job	R5W57JVR4MCAC02YC5V8M33XRYLMWB6U
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	04h51m38s.17
RA (top/left)	05h08m01s.95
RA (top/right)	04h35m15s.50
RA (bottom/right)	04h36m21s.19
RA (bottom/left)	05h06m57s.66

Dec (center)	+46°50′04″.4
Dec (top/left)	+48°34′15″.8
Dec (top/right)	+48°34′10″.8
Dec (bottom/right)	+44°57′55″.6
Dec (bottom/left)	+44°57′50″.10

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Fraternal Twins - Sh2-216 & 221 - SHO

Fraternal Twins - Sh2-216 & 221 - SHO

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Fraternal Twins - Sh2-216 & 221 - SHO

Fraternal Twins - Sh2-216 & 221 - SHO

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