Alternatives to Mauna Kea

[TomK]

Thanks for the link, Carey. I'm a little skeptical about the info there because I'm not sure you can apply it to Mauna Kea. Sky brightness can also be caused by OH- emission high up in the atmosphere. It's not generally a problem for lower altitude sites as they have enough to contend with, but definitely something an experienced night time observer on MK can see (as can certain instruments). Clear sky, no moon but few stars. You can bet that's OH emission and not a lot we can do about it.