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Sh2-132 - The Lion Nebula


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Well been having an exceptionally busy period, so just managing to squeeze in some processing and I still have more to do, here's my latest: -

This was captured at the beginning of November 2020 from my Backyard Observatory.

I have reprocessed this a number of times and finally found some interesting scripts that help me achieve what I was aiming for.

Using a 2007mm FL it is a really busy image, reminiscent of some of my early childhood nightmares, it may well have been better at a shorter focal length.

Here's the link to all the equipment and capture settings, there is just over 10 hours in this. I was trying to concentrate on the start colour and learnt the HSV repair script which was amazing: -


Well here's the Bumf: -

Sharpless 132 is home to Wolf-Rayet star WR153ab. These massive stars are nearing their transition to supernova or black hole. In the OIII wavelength there appears to be a river of blue gasses running up through the nebula. However, reading through as much as I can understand of an abstract on this (https://academic.oup.com/mnras/article/405/3/1976/967297), they note:

"New Hα and [O iii] images taken by Miller & Chu (1993) revealed an arc of 4 arcmin in size to the south of the WR star (at [l, b]=[102°46′, −0°43′]). They concluded that the filament probably indicates the position of an ionization front and considered it to be a ring nebula related to the star. Based on optical data, Esteban & Rosado (1995) found velocities in the range −41 to −59 km s−1 for the arc and derived an electron density of 290 ± 100 cm−3 from line ratios. The [O iii]/Hα ratio is consistent with values derived for ring nebulae, suggesting that WR 153ab is the main source of ionization (Esteban & Rosado 1995). These authors classify the arc as Rs type based on the morphology of this feature and on the absence of a clear evidence of expanding motions in the line profiles. This last point suggests that the massive progenitor of the WR star contributed in the shaping of the nebula (see Chu 1981)."

Fascinating! So this appears to be part of a ring nebula being pushed by the WR star

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Posted by: @AstronomyUkraine

Excellent image John, I have used the HSV repair script a few times on images, some with more success than others.

Thanks Brian, Indeed, I am working on another image at the moment and I used the HSV script on that and they have come out unbelievable, I think a lot depends on the magnitude and with 2007mm FL the stars are a lot bigger, so its the smaller starts that seem much more reactive.

The lion was my first image that I used it on and the star colour was OK, probably better than I would have achieved otherwise.

@GazAstro & @Bob-c Cheers for the compliments, I'd love to get my self onto better bortle skies, but can't see that happening so Bortle 5 it is.


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