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Sh2 131 LRGB


Sh2 131   LRGB

Sharpless 131 is a large Ha region that surrounds the IC 1396 star cluster. This is an image of the IC 1396A globule known as the Elephant’s Trunk nebula. These objects are typically created by a hot star pushing away gas. The globules typically point towards the star. This region is located approximately 2,400 light-years away in Cepheus.

Other noted objects:

The stars around the nebula are part of the Trumpler 27 open cluster.
The dark nebula at the top left is Barnard 161.
There’s a small, blue reflection nebula near the center of the end of the trunk. This is cataloged as vdB 142.

I originally imaged this in Ha and RGB (as I normally do for Sharpless objects) but I thought it might look good in LRGB.

Ha – 12x1800s – 360 minutes – binned 1x1
Luminance – 12x600s – 120 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2

600 minutes total exposure – 10 hours – between the two images

Imaged from Dardenne Prairie, Missouri (a red zone) over five nights in October and November, 2013 with a SBIG ST-8300M on an Astro-Tech AT90DT at f/6.7 603mm.

LRGB – http://www.flickr.co...146485/sizes/l/

HaRGB - http://www.flickr.co...292973/sizes/l/

This would be a great target for a smaller telescope (or 300mm lens) or a mosaic from a dark site. I would have too many gradients to do it from my house.




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