Wolf-Rayet 157 An Enormous Ring Nebula (Jeff Reitzel)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: 1 Cas · 2 Cas · LBN 533 · LBN 536 · LBN 537 · LBN 540 · LBN 544 · NGC 7510 · PK112-00.1 · Sh2-157 · The star 1 Cas · The star 2 Cas

Wolf-Rayet 157 An Enormous Ring Nebula

Most of us recognize this structure as Sh2-157 The Lobster Claw Nebula. An enormous creature with "claws" reaching toward the famous Bubble Nebula (NGC 7635) as if to claim the beautiful jewel for a prize. These "claws" are actually intricate rings carved out of the surrounding nebulosity by emissions from a powerful Wolf-Rayet Star identified as WR157. Wolf-Rayet stars are often associated with spectacular Oiii bubbles formed around them. In other cases like this the result can be much different but equally amazing. This entire nebula spans ~215 light years to give an idea of the size of these rings formed by WR157.

This area is very strong in both Ha and Sii emissions. I have always found it difficult to show much contrast between these emissions in similar areas with my images. During processing I attempted to create some additional contrast between the Ha and Sii using my own custom Pixel Math combinations. A close approximation would be a Foraxx type combination of the Sii and Oiii data with the Ha data added as a luminance layer.

Final
Original
B

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
Artificial satellite

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	...
PixInsight job	RMH3F1DIEOCCINNS5J76GFZH7586S7YS
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	23h15m40s.83
RA (top/left)	23h26m09s.73
RA (top/right)	23h05m12s.51
RA (bottom/right)	23h05m43s.37
RA (bottom/left)	23h25m37s.82

Dec (center)	+60°09′05″.4
Dec (top/left)	+60°58′14″.2
Dec (top/right)	+60°58′21″.3
Dec (bottom/right)	+59°16′55″.9
Dec (bottom/left)	+59°16′47″.7

AstroBin

AstroBin

Image Index:

Contribution Index (beta):

Wolf-Rayet 157 An Enormous Ring Nebula

Wolf-Rayet 157 An Enormous Ring Nebula

Equipment

Acquisition details

Description

Comments

Revisions

Sky plot

Histogram

		...
You have no new notifications.

AstroBin

AstroBin

Image Index:

Contribution Index (beta):

Wolf-Rayet 157 An Enormous Ring Nebula

Wolf-Rayet 157 An Enormous Ring Nebula

Equipment

Acquisition details

Description

Comments

Revisions

Sky plot

Histogram

Notifications

AstroBin is in READ ONLY mode

Sorry :-(

Sorry :-(

Sorry :-(

Are you really sure?

Warning!

Warning!

Are you sure?

Report abuse

Slideshow settings

IOTD/TP stats (last [x] days)

Distribution of astrophotographers

Distribution of subject types

Distribution of data sources

Sorry

Sorry

Share

Upload new revision

Upload uncompressed source (XISF/FITS/PSD/TIFF)

Delete image and all its revisions?

Delete original image?

Delete all other versions?

Delete all revisions?

Delete this revision?

IOTD/TP stats

The following people like this image

The following people bookmarked this image

Error

Flag malfunctioning thumbnails

Contains

Remove yourself as a collaborator

Plate-solving information