Sh2-155: Faint but Active (Alex Woronow)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: HD216629 · HD216658 · HD216711 · HD216898 · HD217035 · HD217061 · HD217086 · HD217099 · HD217312 · HD217463 · LBN 524 · LBN 527 · LBN 529 · PK110+01.1 · Sh2-155

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Sh2-155: Faint but Active

Powered byPixInsight

Sh2-155: Faint but Active

SH2-15:

OTA: Star Fire (175mm f/8)
Camera: FLI PL-16070AE
Observatory: Deep Sky West

EXPOSURES:
Red:        32 x 900 sec
Blue:       17 x 900
Green:       20 x 900
Lum:       23 x 900
Total exposure = 23 hours
Image Width: 1.5 deg

Processed by Alex Woronow in 2018 and redone in 2022 (LRGB stacks by Lloyd from DSW)

(Source: largely Wikipedia )
The Cave Nebula is a molecular cloud at about 2400 light-years, in the constellation of Cepheus. This nebula is a complex of dark nebulae and bright emission nebulae, radiating largely in Hydrogen Alpha (Red). There is active star formation in the nebula. The outer edge of the crescent is illuminated by several massive OB stars. (OB stars are short-lived, and therefore do not move far from where they were born. During their lifetime, they will emit immense amounts of ultraviolet radiation.)

Sh2-155 is relatively faint for amateur observation, some of its structure may be seen visually through a moderately sized telescope under dark skies. I’m not sure what part is the “cave” proper…but then the common names may make sense to a visual observer and be totally enigmatic to an imager; or vice versa!

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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	6395985
PixInsight job	7JDZYL6RTGSIOGN5HO5WUH1DDEPKZFE4
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	22h56m43s.35
RA (top/left)	23h00m52s.74
RA (top/right)	23h00m48s.28
RA (bottom/right)	22h52m22s.25
RA (bottom/left)	22h52m50s.35

Dec (center)	+62°37′11″.5
Dec (top/left)	+61°54′50″.2
Dec (top/right)	+63°20′16″.4
Dec (bottom/right)	+63°19′02″.4
Dec (bottom/left)	+61°53′37″.1

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Sh2-155: Faint but Active

Sh2-155: Faint but Active

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Sh2-155: Faint but Active

Sh2-155: Faint but Active

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