Sharpless nebulae and SNR G114.3+0.3 east of the Bubble (Göran Nilsson)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: Bubble Nebula · LBN 533 · LBN 536 · LBN 537 · LBN 540 · LBN 542 · LBN 543 · LBN 544 · LBN 547 · LBN 548 · LBN 549 · LBN 557 · LBN 565 · LBN 566 · LDN 1225 · LDN 1231 · LDN 1245 · M 52 · NGC 7510 · NGC 7538 · NGC 7635 · NGC 7654 · PK112-00.1 · Sh2-157 · Sh2-158 · Sh2-159 · Sh2-161 · Sh2-162 · Sh2-163 · Sh2-164 · And 2 more.

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Sharpless nebulae and SNR G114.3+0.3 east of the Bubble

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Sharpless nebulae and SNR G114.3+0.3 east of the Bubble

I realized that the area east of the Bubble and Lobster Claw nebulae are rather seldom imaged, including some objects from the Sharpless catalogue inhabiting that region. So I had a go at it the other night. Then I remembered that I had data from 2021 that I could add to the right of the image, making it a 2-panel mosaic with quite a bit of overlap. There are nine Sharpless objects in the image, from Sh2-157 to Sh2-166.

What I did not know I would find is the faint arch-like Oiii and Ha emitting structure up to the left (encircling Sh2-165). Searching the SNR catalogue (https://www.mrao.cam.ac.uk/surveys/snrs/snrs.data.html) I found that it belongs to the supernova remnant SNR G114.3+0.3.. I have not seen any clear optical image showing this SNR so this may be the first one, It is described in this paper: https://adsabs.harvard.edu/full/1997AJ....113..767F

Here is a starless crop that more clearly shows SNR G114.3+0.3:

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Status	Advanced success
Started	...
Astrometry.net job	9402418
PixInsight job	I2IRST5EF2X4P45UPWBNNQA69ZOD9ZSH
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	23h26m25s.73
RA (top/left)	23h45m02s.60
RA (top/right)	23h07m28s.87
RA (bottom/right)	23h09m10s.28
RA (bottom/left)	23h44m07s.74

Dec (center)	+60°54′52″.1
Dec (top/left)	+61°59′50″.1
Dec (top/right)	+61°54′35″.1
Dec (bottom/right)	+59°40′53″.1
Dec (bottom/left)	+59°45′49″.8

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Sharpless nebulae and SNR G114.3+0.3 east of the Bubble

Sharpless nebulae and SNR G114.3+0.3 east of the Bubble

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Sharpless nebulae and SNR G114.3+0.3 east of the Bubble

Sharpless nebulae and SNR G114.3+0.3 east of the Bubble

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