Object name: SH2
Designation(s): SH2, 155, CAVE_NEBULA, LBN529,
This nebula, mostly emission (red) with some reflection characteristics as well (blue) is located in Cepheus. It is part of the Cepheus B molecular cloud. The illuminating stars are considered to be HD 217086 at the top of my image, an O7 star and HD 217061 above center, a B1 star (very slightly smaller and cooler). IR images show a tremendous amount of star formation going on in the cloud (darker portions of my image). These are thought to be triggered by HD 217086. It is outside the cloud itself. Radiation from the star is thought to drive a compression wave into the cloud triggering star formation in the interior while blowing away the cloud's outer layers. Chandra/Spitzer observation in X-ray and IR light show this is happening. The region is thought to be about 2400 light years from us.
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,