Object name: SH2

Designation(s): SH2, 147_SH2, 148_SH2, 149_LBN516_SH2, 152_SH2, 153,

The region of SH2-147, SH2-148, SH2-149, SH2-152 and SH2-153 form the 2 cores of the 105 thousand solar mass molecular cloud [UUT2000] Cloud A according to galaxymap.org. Though their image of SH2-147 is the wrong nebula. I\'d imaged SH2-152 back in 2008 I\'d not realized I could have included all these other objects as well. So I reimaged the area in September 2010 then somehow forgot about it. In yet another sweep of the hard drive, it showed up. So this is yet another long-lost image I didn\'t realize I had. I found a second lost object but it had too poor red and green data so I know why it never got processed but it also never got back on the to-do list either so it sat in limbo as well.

SH2-147, 8 and 9 form one core in the lower right of my image with SH2-149 the bright member. SH2-147 is very faint and mostly off the frame. It would need much more time with a narrow band filter for proper exposure. While SH2-148 is on the frame it is hard to see as well. The annotated image points to its coordinate location. How it\'s seen as a separate object I don\'t know. There are other obvious pieces around SH2-149 that I can\'t find in SIMBAD at all. Some are HII regions other reflection nebulae of some sort (IFN in some cases?). Well above SH2-149 is the variable star DI Cephi. It sits in a dark hole in this large faint nebulosity. Apparently, the dark hole is just a gap in whatever is being illuminated as no dark nebula or bright nebula is listed for this area that I could find.

SH2-152 and SH2-153 seem oddly named since these are normally in Right Ascension order. Like SH2-148, I have trouble seeing SH2-153 as a separate object from the much brighter SH2-152. While the illuminating stars for SH2-149 appears to be a small star cluster [BDS2003] 35 the star cluster [BDS2003] 36 illuminates SH2-152 according to galaxymap. Within the nebula is a young stellar object likely formed from the nebula. Another is nearby to the southeast. See the annotated image. To the southeast of SH2-153 is the large rather faint region apparently caused to glow by CG) 649 a 09.5V star. It is IRAS 22571+5828 as best as I can determine. That object is listed in SIMBAD as a composite object, whatever that means. I have no idea if this object is related to the Sharpless objects or not. Other small reflection nebulae are seen around SH2-152 but I don\'t find them in SIMBAD.

While the annotated image points to the position that SIMBAD and others use for SH2-153 I can\'t help but wonder if the large object to the southwest might not be the \"real\" SH2-153. It seems too obvious to have been overlooked by Sharpless. By the same token SH2-248 is virtually invisible but the small blob to the northeast of SH2-149 is obvious. Could 149 be 148 and the anonymous object 149? I\'m pretty ignorant on the Sharpless objects so I may be way off base here. Anyone have better knowledge here? I have seen some amateur images of SH2-152 and 3 that do consider the large faint cloud as SH2-153 but all of SH2-148 seem to point to the area I\'ve noted in the annotated image.

I find little distance information. One paper says 1000 to 3000 parsecs.

My original 2008 image of the SH2-152 region was taken under better seeing but my color processing was poor or the data was poor. I don\'t know which. It is listed under SH2-152 and SH2-153.

14\" LX200R @ f/10, L=4x10\' RGB=2x10\', STL-11000XM, Paramount ME