Can I have this RC when the mission is done???

http://www.galex.caltech.edu/TECHNOLOGY/telescope.html

It can be arranged, but you've go to pick it up yourself!

*****
May you have clear skies & a star to steer by! =A4Michael=A4

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the optic set was done by Jerry Brunache on zerodur. I believe it was
F4 at 1/37 wave. if you ask politely he might make another. if You
really do want one you might try Aries or kodak and get it ion milled
for 1/100 wave. the OTA was made by lightworks. if I had to estimate
I'd say it would be about $200K for them to do it plus at least 100k
for the sensor (which I believe was a SITe). you could get something
similar for ~20k if you just want it for visual/CCD.

mike

On 16 Dec 2004 18:33:33 -0800, wrote:

It can be arranged, but you've go to pick it up yourself!

*****

Not a problem! It's within a couple hundred miles!
-Rich

On 16 Dec 2004 21:56:34 -0800, wrote:

the optic set was done by Jerry Brunache on zerodur. I believe it was
F4 at 1/37 wave. if you ask politely he might make another. if You
really do want one you might try Aries or kodak and get it ion milled
for 1/100 wave. the OTA was made by lightworks. if I had to estimate
I'd say it would be about $200K for them to do it plus at least 100k
for the sensor (which I believe was a SITe). you could get something
similar for ~20k if you just want it for visual/CCD.

mike

On a more serious note, no one does ground-based ultraviolet study, do
they?
-Rich

RichA wrote:
On 16 Dec 2004 21:56:34 -0800, wrote:

the optic set was done by Jerry Brunache on zerodur. I believe it was
F4 at 1/37 wave. if you ask politely he might make another. if You
really do want one you might try Aries or kodak and get it ion milled
for 1/100 wave. the OTA was made by lightworks. if I had to estimate
I'd say it would be about $200K for them to do it plus at least 100k
for the sensor (which I believe was a SITe). you could get something
similar for ~20k if you just want it for visual/CCD.

mike

On a more serious note, no one does ground-based ultraviolet study, do
they?

Not as long as we've left some of the ozone layer in place, no. You
can work down to about 320nm if you're looking almost straight up
and make appropriate absorption corrections plus deal with the
huge differehtial refraction (while observing some galaxies at that
range from Kitt Peak, I was amused to find that when the UV light
came down the 6" spectrograph aperture, the visual image on the
TV was completely outside that little hole).
Even going to an SR-71 (which was tried a few times) gets you only
a narrow window somewhere around 250nm; the ozone is almost all above
that. The very tip of what we can do from the ground used to be called
near-ultraviolet, but that's sort of been taken over by part of the
range accessible only from space (formerly "vacuum ultraviolet").

And please don't arrange pickup of the optics until at least my GALEX
project is completed, thanks...

Bill Keel

In article ,
William C. Keel wrote:
RichA wrote:

On a more serious note, no one does ground-based ultraviolet study, do
they?

Not as long as we've left some of the ozone layer in place, no.

Would going to Antarctica help, or is the ozone hole only a relative
depletion of ozone, so there's enough left to absorb in the UV?

Tom

RichA wrote:
On 16 Dec 2004 21:56:34 -0800, wrote:


the optic set was done by Jerry Brunache on zerodur. I believe it was
F4 at 1/37 wave. if you ask politely he might make another. if You
really do want one you might try Aries or kodak and get it ion milled
for 1/100 wave. the OTA was made by lightworks. if I had to estimate
I'd say it would be about $200K for them to do it plus at least 100k
for the sensor (which I believe was a SITe). you could get something
similar for ~20k if you just want it for visual/CCD.

mike


On a more serious note, no one does ground-based ultraviolet study, do
they?

Aren't you part of the Astro-conspiracy? We're working on reducing the
Ozone Layer to where ground-based uv astronomy is feasible. Buy
sunscreen stock.

Thomas Womack wrote:
In article ,
William C. Keel wrote:
RichA wrote:

On a more serious note, no one does ground-based ultraviolet study, do
they?

Not as long as we've left some of the ozone layer in place, no.

Would going to Antarctica help, or is the ozone hole only a relative
depletion of ozone, so there's enough left to absorb in the UV?

Only slightly - across most of the UV, absorption is something like
a factor-of-100,000 thing, so half that doesn't help much. You
can nibble around the edges of the problem a bit, though. Antarctic
winter might let you work a little farther into the UV than
other sites (280nm instead of 300?). Being in a high dry site
helps right around the cutoff, where scattering by small particles
ca also be important. Don Hayes (guru of photometric calibrations)
put together a table years ago showing that from typical mountaintops,
this scattering was as important as ozone absorption around 320nm.
I recall seeing some spectra from Mauna Kea that were usable down
around 310. (For bright enough targets, you can go a bit farther - I
dimly recall a spectrum of Venus taken from altitude 1300 m which
went down almost to 280 nm).

Bill Keel