Repeating one more of the Sharpless2 Group to see what my new CMOS system can find with a deeper look at the H-alpha here.... unfortunately not much to see.
Previous version of SH2 120-121. 5h on the CCD and he objects "pop". With the CMOS you get all the background H-alpha.
Sh2 120 and 121 H-alpha RGB Discussion of GHS aspects of processing:
GHS Forum DiscussionFrom GalaxyMap:A radio map of Sh 2-120 shows a shell-like structure around a central source. Very little information is available in the literature apart from this map.
According to a 1978 study, 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".
Sh 2-120 appears behind the much closer dark nebula
LDN 988, which has been informally called the Pincushion cloud.
GENERAL NOTE ON SHARPLESS2 OBJECTS>>>>>>>>>>>>>There are 313 Sh2 objects. All now imaged.
This is my collection:
Sharpless2Wide-Angle Hydrogen Alpha Nikon Image Sh2 79-171Please note there is also a Sharpless2 Group with now more than 2700 examples.
Sharpless2 GroupOther useful links include:
Gary Imm's CollectionGalaxyMap's CollectionThe Sharpless CatalogThe MDW H-alpha Sky SurveyReiner Vogel's detailed observing catalogHope you enjoy these obscure but interesting objects...
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