RCW58 (John Dziuba)

Celestial hemisphere: Southern · Constellation: Carina (Car) · Contains: HD96265 · HD96309 · HD96548

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RCW58

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RCW58

RCW58 is an E type nebula, formed by a bubble of ejecta around the massive Wolf Rayet star WR40. When viewed in two dimensions, it appears as a ring. In these type of nebula, it is common to see the outer most edge O3 emission leading the Ha emission. This is due to the shock wave from the Wolf Rayet bubble expanding into the surrounding envelope.

Although the shape and mechanism (central star ejecta) responsible for the formation of the bubble is similar to that of a planetary nebula, the nature of the central star is completely different. Wolf Rayet stars are immense, short lived, and extremely hot stars that usually end their short lives in a supernova. Planetary nebula have much smaller degenerate stars at their centers, usually a white dwarf. Both types eject material from their atmospheres, causing the ionized bubble to form.

This was an exceedingly difficult image to process, and this explains why there are so few images of this object on Astrobin. The signal is weak and the star field is dense. My goal was to separate and amplify the extremely faint background Ha signal and the very faint O3 signal from the noise floor. I collected 42hrs of data which is more than my usual in order to resolve these faint features.

Hope you like it.
CS

Fine Art Astrophotography
Southern Hemisphere Astro

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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.
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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	9684919
PixInsight job	FO48NRCGNYSQ5YC8L0HY1R9K9UW0K3G0
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	11h05m41s.364
RA (top/left)	11h03m04s.686
RA (top/right)	11h08m13s.699
RA (bottom/right)	11h08m15s.898
RA (bottom/left)	11h03m11s.502

Dec (center)	-65°29′23″.60
Dec (top/left)	-65°40′30″.19
Dec (top/right)	-65°41′09″.00
Dec (bottom/right)	-65°18′06″.82
Dec (bottom/left)	-65°17′29″.11

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RCW58

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