Sh2-188 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: LBN 633 · PK128-04.1 · Sh2-188

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Sh2-188

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Sh2-188

This object is a beautiful planetary nebula that is located approximately 850 light-years from Earth in the constellation of Cassiopeia. This nebula was first thought to be the remnant of a supernova explosion that appeared recently, but the nebula was later confirmed to be an asymmetrical planetary nebula with a crescent-like shape. Most planetary nebulae simply expand outwards symmetrically, forming a spherical shell around the dying star. It is believed that this nebula gets its interesting shape from the speed at which the gas is moving and interacting with the interstellar medium. The sun-like star responsible for expelling all of the gases into space is thought to be moving at about 300,000 mph, and is visible in the image as the brightest orange star just to the right of the center of the nebula. The motion of the star is to the lower right, which creates the visible bow shock of primarily reddish hydrogen gas. Some oxygen is also present as indicated by the bluish tint behind the initial bow wave.

Looking closely at the section towards the center of the nebula, I like how the faint vertical reddish stripes define the bow wave which is coming in our direction, giving the nebula a subtle 3-D look.

The refractors!
Cloudy Nights
ZWO ASI1600MM/QHY163M
Narrowband imaging
Sharpless2 Objects

Ancient PN
Orphaned Beauties Catalog (Complete)
Sharpless Catalog (200/313)

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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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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	6172082
PixInsight job	ZIU0HKQBTBEJK7Z72ON8IMAY0KP735NF
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	01h30m22s.378
RA (top/left)	01h28m12s.641
RA (top/right)	01h30m15s.130
RA (bottom/right)	01h32m31s.166
RA (bottom/left)	01h30m30s.300

Dec (center)	+58°25′23″.79
Dec (top/left)	+58°33′27″.57
Dec (top/right)	+58°06′38″.48
Dec (bottom/right)	+58°17′11″.52
Dec (bottom/left)	+58°44′09″.29

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Sh2-188

Sh2-188

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Sh2-188

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