Object name: SH2
Designation(s): SH2, 165, LBN565,
Sh2-165 AKA LBN 565 is a rather faint emission nebula Cassiopeia 1.75 degrees east of M52. It is likely part of the Cas OB5 supershell. I found three different distance measurements: 1.6±.5kpc, 1.9±.4kpc and simply 1.7kpc. In light-years that's 5,200±1,600; 6,200±1,300 and 5,500 light-years respectively. So say between 5000 and 6000 light years wouldn't be too far off. Distances to such objects is not easy to determine. It's surprising three different methods agreed so well. The one reference to its illuminating star says it is a B0.5V star but didn't give a position. I assume it is the bright one at the core but sometimes this isn't correct. While it is blue it doesn't seem as blue as I'd expect for a main sequence early B giant star.
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,