Various Collections for Comparison:

I am going over the Sharpless2 Objects again with my new C11 and a few more years experience. 

The current image with the C11 focuses on the details of the small nebula in the starless mouse-over. 

This version is about 2h of Ha and RGB and processed with StarX and BlurX and GHS.

Have photographed this before.  Below are two with my Stellarvue and another with Rob's Astrotech 10" RC.  


Sh2 127

Sh2 127 HA RGB

Sh2 127


Basic Information From GalaxyMap about Sh2 127:

Sh 2-120, Sh 2-121, Sh 2-127 and Sh 2-128 are all at about the same distance of 7500 parsecs and are "probably distant HII regions associated with a spiral feature more distant than the Perseus arm".[1]

Radio analysis reveals that Sh 2-127 consists of two distinct components - a larger weaker and more diffuse source (WB89 85A) to the northeast, consistent with ionisation by an O7 class star, and a stronger but smaller source to the southwest (WB89 85B), consistent with ionisation by an O8.5 class star. (However, it is also possible that both components are ionised by a single star.) Both components are located near the northwestern edge of a molecular cloud and are embedded in the molecular gas.[2]

SIMBAD associates Sh 2-127 with the radio source KR 17, but this paper identifies KR 17 with Sh 2-187 in a completely different region of sky.[3]

Notes: 

1. ^ Crampton, D., Georgelin, Y. M., & Georgelin, Y. P. (1978). "First optical detection of W51 and observations of new H II regions and exciting stars", Astronomy and Astrophysics, Vol. 66, 1-11. [[url=http://adsabs.harvard.edu/abs/1978A%26A....66....1C]1978A&A....66....1C]  

2. ^ Rudolph, Alexander L., Brand, Jan, de Geus, Eugene J., et al. (1996). "Far Outer Galaxy H II Regions", The Astrophysical Journal, Vol. 458, 653. [[url=http://adsabs.harvard.edu/abs/1996ApJ...458..653R]1996ApJ...458..653R]  

3. ^ Kerton, C. R. (2006). "A sharper view of the outer Galaxy at 1420 and 408 MHz from the Canadian Galactic Plane Survey - I. Revisiting the KR catalogue and new Gigahertz Peaked Spectrum sources", Monthly Notices of the Royal Astronomical Society, Vol. 373, 1203-1212. [[url=http://adsabs.harvard.edu/abs/2006MNRAS.373.1203K]2006MNRAS.373.1203K]

Distance Estimates:

9700 pc [[url=http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2003A&A...397..133R]2003A&A...397..133R]
7500 pc [[url=http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1978A&A....66....1C]1978A&A....66....1C]

GENERAL NOTE ON SHARPLESS2 OBJECTS>>>>>>>>>>>>>

There are 313 Sh2 objects.  All now imaged by yours truly.  These are basically the Hydrogen Alpha and other ionized nebulae around the edge of the Milky Way.

This is my collection:

Sharpless2

Wide-Angle Hydrogen Alpha Nikon Image Sh2 79-171

Please note there is also a Sharpless2 Group with now more than 3000 examples.

Sharpless2 Group

Other useful links include:

Gary Imm's Collection

GalaxyMap's Collection

The Sharpless Catalog

The MDW H-alpha Sky Survey

Reiner Vogel's detailed observing catalog

Hope you enjoy these obscure but interesting objects...