AP#68 : M13
Name: The "Great Hercules"cluster
Constellation:Hercules
Instrument: 8-inch F5 reflector with sky watcher coma corrector and a modified Nikon D3300.
Exposure time: A stack of 16 five-minute exposures at ISO 800.
Star Chart from Michael Vlasov's Deep sky hunter star atlas available on line https://www.deepskywatch.com/deep-sky-hunter-atlas.html
Magnitude: 5.8
Angular size: 20'
This is the second, and last, globular cluster on the list. M13 has rival globular clusters visible from the northern hemisphere (M22, M3, M5, M4) but M13 is prominently placed in the sky and it has an interesting shape that puts it on the list. There is a nearby galaxy (NGC 6207) that is at the top in this image. An even smaller galaxy (IC 4617) can be seen about halfway between NGC 6207 and the cluster.
