Sh2-308 (Extracted Emission Lines) True-Color HOx (Alex Woronow)

Celestial hemisphere: Southern · Constellation: Canis Major (CMa) · Contains: HD50492 · HD50563 · HD50591 · HD50679 · HD50896 · HD51034 · HD51155 · LBN 1052 · Sh2-308

Sh2-308 (Extracted Emission Lines) True-Color HOx

Sh2-308 (Extracted Emission Lines) True-Color HOx

OTA:……………….PlaneWave 17” f/6.8
Camera:………….FLI ML16803
Observatory:…. Deep Sky West, Chile

EXPOSURES:
B: 14 x 600 sec
G: 12 x 600
R: 16 x 600
H: 18 x 1800
O: 12 x 1800
Total exposure 19.2 hours

Image Width: 40 arc-minutes
Processed by Alex Woronow (2022) using PixInsight, Topaz, Custom Scripts

This bubble surrounds a Wolf-Rayet star that is in its brief pre-supernova phase. As the bubble expands, it is encountering debris from an earlier, similar event. The nebula apparently formed just 70,000 years ago and is reported on a Hubble web page as consisting of ionized hydrogen, but considerable OIII also exists, as this data set shows.

This image shows the distribution and colors of the isolated emission lines (Ha and OIII) with the continuum flux removed. My color-mapping of the Ha and OIII lines is described in previous images, or contact me for more information. The L-channel of this image is from the ratio of OIII/Ha with a small amount of L introduced from the emission-line image.

The image was color-calibrated using Pixinsight’s photometric method, and a battery of Topaz programs provided most of the post-processing.

Alex W

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Status	Advanced success
Started	...
Astrometry.net job	6108720
PixInsight job	JQ66QIZIJJ0945MOLUB5H74LCP21YRWP
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	06h53m47s.81
RA (top/left)	06h52m08s.63
RA (top/right)	06h55m01s.79
RA (bottom/right)	06h55m26s.69
RA (bottom/left)	06h52m34s.32

Dec (center)	-23°41′51″.3
Dec (top/left)	-23°58′41″.2
Dec (top/right)	-24°04′29″.4
Dec (bottom/right)	-23°24′55″.7
Dec (bottom/left)	-23°19′09″.1

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Sh2-308 (Extracted Emission Lines) True-Color HOx

Sh2-308 (Extracted Emission Lines) True-Color HOx

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Sh2-308 (Extracted Emission Lines) True-Color HOx

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