Re: Difficult galaxies.

> These are all extremely low surface brightness dwarfs requiring
> excellent conditions, experienced eyes and generally a 12-inch to 20-
> inch scope.

Thanks Steve,

In perusing the local group, I kind of divided the list into the easy, the medium, the hard, and the impossible.

easy includes things like NGC 147 and NGC 6822.
medium includes some of the items you listed below like sculptor dwarf and some of the IC's
hard is that list I posted yesterday
and impossible are the ones that I can't see even with averted vision on the DSS images!

> If you decide to go after these, be sure to add the Draco Dwarf, Ursa
> Minor Dwarf, Sculptor Dwarf, Pegasus Dwarf, Fornax Dwarf, Pisces
> Dwarf and other toughies to this list.

Yes - those are all on the list already.

I now need to invent a toughness formula that can give a single toughness measure as a function of both surface brightness and size that can be used to produce a total ordering by toughness.

Thanks! -DG

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