Scottie wrote:
> Martin, I had a look at your link showing amateur astronomers photographs.
> While looking at the wonderful shot of the moon, I was amazed at the
clarity
> and detail of this shot. It made me wonder, if you used the most powerful
> telescope available, how small an object could be identified from earth? I
> know this question is nothing to do with this thread but I just had to ask
> you. Hope you don't mind?
The maximum usable power for a telescope based on Earth is limited by a
number of factors, the most significant of which is our dirty and unstable
atmosphere. Therefore, no matter how large the telescope is, occasions when
magnifications over 500x can be beneficially employed are rare. Even then,
perhaps 700x to 800x is the maximum which can be used without "seeing
conditions," no matter how good, getting in the way.
A scope's resolution is another significant factor and this is directly
proportional to the diameter of the primary lens or mirror. My main
telescope has a 12.5 inch diameter primary mirror and with it, under good
conditions and at a power of 400x or so, lunar objects of a thousand feet
across are visible although things this small don't show much detail. They
just *show* ;o)
It is not possible to see debris or flags or other remnants left on the moon
by the missions of last century through any telescope based on earth -- no
matter how large the scope may be.
--
Martin
"Photographs From the Universe of Amateur Astronomy"
http://home.earthlink.net/~martinhowell