Sh2-82 is often called the Little Cocoon which it does resemble with the
inner emission region and halo of reflection blue though it is much
fainter and lower in the sky being in Sagitta. Galaxymap.org puts it at
about 3600 light years. It is also known as the Little Triffid though I
can't see the resemblance other than both emission and reflection
elements are involved with both. The bright star in the center of the
emission (red) region is HD 231616 which Galaxymap credits as being the
illuminating star. There are several dark nebula in the image
identified at Simbad. But some I really wanted to know about aren't
listed. Those that are I've noted on the annotated image though I left
off a few that were so indistinct I couldn't see anything at those
locations. Yet some very dark ones have no listing. It's very
discouraging. SDC stands for the Spitzer Dark Catalog. Since the
Spitzer space telescope operates deep in the infrared part of the
spectrum it might be these stand out well at those wavelengths. I found
no LN or other visual dark catalog entries for this field.
This one needs a much wider field of view than I can give it. For that
See Tom Davis' superb image at:
http://tvdavisastropics.com/astroimages-1_000086.htm He used nearly 14
hours of data, over 10 times what I used so shows fainter detail.
Due to two massively bright satellites, one in red and one in green
frames that I didn't know were there until I went to process this I am
limited in color data for those channels. All attempts to process them
out with only two frames failed miserably. Even my old darken combine
trick didn't work, leaving some nasty color traces. I really need to
put a lot more time into this one this summer.
14" L200R @ f/10, L=4x10' GR=1x10'x3 B=2x10'x3, ST-11000CM, Paramount ME
Rick
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Correct domain name is Arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".