In message , Stephen Tonkin
writes
Jonathan Silverlight
wrote:
It's even being used by amateurs, which is definitely not the case for
the Doppler technique.

Not so. See the magnificent achievements of Tome Kaye and his
collaborators at:
http://www.spectrashift.com/

That was quick! As Samuel Johnson noted "you will find it a very good
practice always to verify your references!" and when I don't, I usually
regret it.
I'm very impressed. It seems there's very little well-equipped amateurs
can't do. It wasn't long before Jack Newton imaged the Hubble Deep
Field, for instance.
Which brings me to something I saw recently. How faint is Io in eclipse,
as imaged by Galileo and shown on the last "Sky at Night"? Could an
interference filter be used to isolate aurora light, for instance?
--
Rabbit arithmetic - 1 plus 1 equals 10
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