Object name: SH2
Designation(s): SH2, 239, LBN821,
Sharpless 239 is a mostly reflection/dark nebula with several Herbig-Haro objects embedded in it -- the pink spots. It also contains a mystery I've not been able to solve. Notice the three near star-like points in a triangle in its center. The POSS 1 and 2 plates show only two. The one at the lower left is missing! I've tried to find out about it but so far with no luck. My first thought was a variable star though I couldn't find any listed for its position. Checking what few images of this object exist on the net I find all modern ones show the star-like object but those dating to the time of the POSS plates don't. I contacted an astronomer in Hawaii that was supposed to be an expert and was told it was on his narrow band image (great shot with a 2.5 meter scope) but he provided no date. Since it wasn't a "new" object he wasn't interested and told me that it was worthless to compare narrow-band images to the POSS plates, totally ignoring the fact my shot wasn't narrow-band! I wrote him back asking why it wasn't allowed to compare wide-band red images to red POSS plates and got no reply. Maybe my email didn't get through his filters. My original email was relayed by another astronomer who I didn't bother to relay my reply. Thus he will remain nameless here. It appears that sometime between the POSS plates and today this object has come out of the murky depths of the nebula for us to see. Though in doing so it didn't change the nebula much that I can see. I do see a slight brightening in this area on the POSS 2 plates so it may have just started to appear about that time. Or maybe it is a variable star everyone since has caught at near maximum. I just don't know.
Related Designation(s):2MASX J04403475+5027419, 2MASX J23050983+6014560, 6C B043646.6+502153, 7C 0436+5022, 87GB 043647.6+502152, 87GB 230304.2+595825, 87GB[BWE91] 0436+5021, 87GB[BWE91] 2303+5958, IC 1470, NGC 1624, NVSS J044036+502744, NVSS J230510+601438, SHARPLESS 212, TXS 2303+599, [GMT2008] IR 23030, [KC97] G110.1+00.0, [KC97] G155.4+02.6, [WB92] 0436+5021, [WB92] 2303+5958, [ZHB90] G110.109+00.047,