Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  Bubble nebula  ·  M 52  ·  NGC 7510  ·  NGC 7538  ·  NGC 7635  ·  NGC 7654  ·  PK110-00.1  ·  PK112-00.1  ·  Sh2-157  ·  Sh2-158  ·  Sh2-159  ·  Sh2-161  ·  Sh2-162
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Sh2-157 - 2018, Gary Imm
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Sh2-157 - 2018

Getting plate-solving status, please wait...
Sh2-157 - 2018, Gary Imm
Powered byPixInsight

Sh2-157 - 2018

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Description

This narrowband image captures many different deep sky objects in the constellation of Cassiopeia. I have added an annotated image to accompany the description below.

The largest object in this image is Sh2-157. This bright emission nebula is located 8000 light-years away and is over 200 light-years across. This nebula has been described as a ring nebula surrounding the Wolf-Rayet star WR 157. WR 157 is a member of the Markarian 50 star cluster. Although I can see the emission fronts expanding from the WR 157 source star, the surrounding structures are very complex and it seems a bit simplistic to me to just describe this fascinating object as a ring nebula.

The most striking object in this image is NGC 7635, the Bubble Nebula, which is located about 7,000 light years away. Although it looks small in the image, the bubble diameter is about 7 light years across, or 500,000 times the distance from the earth to the sun. The bubble is caused by a stellar wind emitted from the source star (another Wolf-Rayet star). These WR stars expel a significant amount of mass, resulting in the expanding gas bubble which is contained by the molecular cloud which surrounds it.

The very dim and uniquely shaped tubular planetary nebula KjPn8 is seen above the Bubble Nebula. This object, first identified by Kazaryan and Parsamyan in 1971, is a small faint planetary nebula located 5000 light years away in the constellation of Cassiopeia. Its unique shape is believed to be due to a bipolar, rotating jet.

Numerous other deep sky objects, including star clusters, planetary nebulae, reflection nebulae, dark nebulae and emission nebulae, are identified on the annotated image. It is amazing to me how many small dark nebulae and dust lanes are scattered throughout this image.

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    Sh2-157 - 2018, Gary Imm
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  • Sh2-157 - 2018, Gary Imm
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Sh2-157 - 2018, Gary Imm

In these collections

Emission (Full NB) Nebulae