Sh2-170 (Kirby Collins)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: 10 Cas · HD225273 · LBN 577 · LDN 1260 · LDN 1263 · Sh2-170 · The star 10 Cas

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Sh2-170

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Sh2-170

SH2-170 is an emission nebula in the constellation Cassiopeia, along the edge of the Cassiopeia supershell. With its circular shape and layered detail, it resembles a smaller version of the Rosette Nebula.

A study of the nebula (Roger et al, https://ui.adsabs.harvard.edu/abs/2004A%26A...425..553R/abstract) concluded that it consistent with the "champagne" model of an ionized HII region created by a newly formed star near the edge of a dense hydrogen cloud. When the shock wave from the expanding ionization front reaches the edge of the cloud, the ionized gases erupt from the cloud at supersonic velocities.

This is another really faint nebula...I collected 60x30 seconds each RGB for the stars, then 90x300 seconds each of Ha (hydrogen), OIII (oxygen), and SII (sulfur) emission data. At 24 hours total over three nights, this is the most exposure time I've ever collected for a single target.

Please note: The following tables are updated every 24 hours.

Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
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	6605440
PixInsight job	B3VMIYB5BMSNSDM83WYFWYR347FCYPUW
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h01m38s.36
RA (top/left)	00h07m01s.41
RA (top/right)	00h06m00s.98
RA (bottom/right)	23h55m59s.99
RA (bottom/left)	23h57m29s.73

Dec (center)	+64°37′34″.6
Dec (top/left)	+63°59′35″.7
Dec (top/right)	+65°21′11″.4
Dec (bottom/right)	+65°14′49″.8
Dec (bottom/left)	+63°53′34″.10

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Sh2-170

Sh2-170

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Image Index:

Contribution Index (beta):

Sh2-170

Sh2-170

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Description

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