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Date: 11 Jul 2007 08:13:09
From: enigma
Subject: want some hints on this topic....
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astronomical observatory at moon surface vis-a vis low earth orbiting
observatory.....give your ideas....and help...i want it urjently....
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Date: 12 Jul 2007 14:56:21
From: David Knisely
Subject: Re: want some hints on this topic....
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For an optical observatory, the moon would not make quite as much sense
as an observatory in Earth orbit. However, for RADIO Astronomy, the
moon makes a great shield against electromagnetic interference from the
Earth. I can see large radio telescopes being built in craters just
over the far side of the moon for this reason, although they would have
the same observing restrictions due to the moon's blocking of a large
portion of the sky for many days at a time. Clear skies to you.
--
David W. Knisely KA0CZC@navix.net
Prairie Astronomy Club: http://www.prairieastronomyclub.org
Hyde Memorial Observatory: http://www.hydeobservatory.info/
**********************************************
* Attend the 14th Annual NEBRASKA STAR PARTY *
* July 15th-20th, 2007, Merritt Reservoir *
* http://www.NebraskaStarParty.org *
**********************************************
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Date: 12 Jul 2007 20:08:16
From: Sam Wormley
Subject: Re: want some hints on this topic....
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David Knisely wrote:
> For an optical observatory, the moon would not make quite as much sense
> as an observatory in Earth orbit. However, for RADIO Astronomy, the
> moon makes a great shield against electromagnetic interference from the
> Earth. I can see large radio telescopes being built in craters just
> over the far side of the moon for this reason, although they would have
> the same observing restrictions due to the moon's blocking of a large
> portion of the sky for many days at a time. Clear skies to you.
Two lunar radio telescopes at longitudes almost 180 degrees difference,
but still shadowed from the earth and its radiating satellites, would
give close to full coverage of the sky at all times.
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Date: 11 Jul 2007 23:42:54
From: IMPEACH BUSH NOW!
Subject: Re: want some hints on this topic....
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enigma wrote:
> astronomical observatory at moon surface vis-a vis low earth orbiting
> observatory.....give your ideas....and help...i want it urjently....
Welllll
......................................................................................
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Date: 11 Jul 2007 11:33:57
From: AustinMN
Subject: Re: want some hints on this topic....
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On Jul 11, 3:13 am, enigma <enigma11.unsol...@gmail.com > wrote:
> astronomical observatory at moon surface vis-a vis low earth orbiting
> observatory.....give your ideas....and help...i want it urjently....
On the moon, only half the sky is accessible at a time because the
moon is in the way. It could take weeks for the moon to rotate to
gain access to an important event such as a powerful GRB or supernova.
In low earth orbit, only half the sky is accessible at a time because
the earth is in the way. But the maximum you would have to wait to
gain access would be about 45 minutes, depending on exactly how high
the orbit was.
On the moon, an active tracking mechanism is needed to keep the
telescope on target.
In low earth orbit, an aiming mechanism is needed, but once positioned
and stabilized, the scope will stay on target until acted on by an
outside force.
On the moon, a telescope would either 1) Only be able to operate 50%
of the time (when the scope's solar cells are facing the sun), or 2)
be able to store sufficient operating energy to run for several weeks
without solar power. This would require twice as much solar panel
capacity (along with much bigger batteries) because the solar panels
would have to not only power the telescope, but charge the batteries.
In low earth orbit, the scope could be placed where it got solar power
most or even nearly all the time, with "blackout" periods lasting
minutes instead of weeks. Smaller batteries, smaller solar arrays.
I know of no significant optical advantage to either.
Austin
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Date: 11 Jul 2007 16:58:13
From: Sam Wormley
Subject: Re: want some hints on this topic....
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enigma wrote:
> astronomical observatory at moon surface vis-a vis low earth orbiting
> observatory.....give your ideas....and help...i want it urjently....
>
A given telescope is less costly to deploy, operate and maintain
in LEO as opposed to the moon.
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Date: 11 Jul 2007 10:54:50
From: Howard Lester
Subject: Re: want some hints on this topic....
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"Sam Wormley" wrote
> A given telescope is less costly to deploy, operate and maintain
> in LEO as opposed to the moon.
I agree. The moon is very difficult to maintain.
;-)
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Date: 11 Jul 2007 18:19:02
From: Chris L Peterson
Subject: Re: want some hints on this topic....
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On Wed, 11 Jul 2007 10:54:50 -0700, "Howard Lester" <hlester@mmto.org >
wrote:
>I agree. The moon is very difficult to maintain.
But fortunately, it seems to require very little maintenance. Its
condition doesn't seem to have changed significantly over my life. Wish
my cars held up as well!
_________________________________________________
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
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Date: 11 Jul 2007 18:55:11
From: John Nichols
Subject: Re: want some hints on this topic....
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"Chris L Peterson" <clp@alumni.caltech.edu > wrote in message
news:1m7a93psth78j5arqn69n5lnstqnfg1gk9@4ax.com...
> On Wed, 11 Jul 2007 10:54:50 -0700, "Howard Lester" <hlester@mmto.org>
> wrote:
>
>>I agree. The moon is very difficult to maintain.
>
> But fortunately, it seems to require very little maintenance. Its
> condition doesn't seem to have changed significantly over my life. Wish
> my cars held up as well!
>
> _________________________________________________
>
There is that dust issue, though.
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Date: 11 Jul 2007 23:48:15
From: OG
Subject: Re: want some hints on this topic....
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"John Nichols" <bejay@worldnet.att.net > wrote in message
news:jI9li.164289$Sa4.79403@bgtnsc05-news.ops.worldnet.att.net...
>
> "Chris L Peterson" <clp@alumni.caltech.edu> wrote in message
> news:1m7a93psth78j5arqn69n5lnstqnfg1gk9@4ax.com...
>> On Wed, 11 Jul 2007 10:54:50 -0700, "Howard Lester" <hlester@mmto.org>
>> wrote:
>>
>>>I agree. The moon is very difficult to maintain.
>>
>> But fortunately, it seems to require very little maintenance. Its
>> condition doesn't seem to have changed significantly over my life. Wish
>> my cars held up as well!
>>
>> _________________________________________________
>>
> There is that dust issue, though.
and the footprints.
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Date: 11 Jul 2007 12:32:57
From: Howard Lester
Subject: Re: want some hints on this topic....
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"John Nichols" wrote
>>>I agree. The moon is very difficult to maintain.
> There is that dust issue, though.
Easy: broom, dust pan, garbage can. Or, send my mother up there -- she'll
keep the place dusted.
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Date: 11 Jul 2007 23:44:10
From: IMPEACH BUSH NOW!
Subject: Re: want some hints on this topic....
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No air Howard!
Howard Lester wrote:
> "John Nichols" wrote
>
> >>>I agree. The moon is very difficult to maintain.
>
> > There is that dust issue, though.
>
> Easy: broom, dust pan, garbage can. Or, send my mother up there -- she'll
> keep the place dusted.
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Date: 12 Jul 2007 22:22:56
From: Marty
Subject: Re: want some hints on this topic....
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>No air Howard!
It's a nice place to visit, but there's no atmosphere.
A HAW HAW HAW A HAW HAW HAW HAW HAW A HAW HAW HAW a hack hack kaff kaff
kaff...
Marty :D
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Date: 12 Jul 2007 00:18:56
From: George
Subject: Re: want some hints on this topic....
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"Howard Lester" <hlester@mmto.org > wrote in message
news:f73b9a$k7h$1@onion.ccit.arizona.edu...
>
> "John Nichols" wrote
>
>>>>I agree. The moon is very difficult to maintain.
>
>> There is that dust issue, though.
>
> Easy: broom, dust pan, garbage can. Or, send my mother up there -- she'll
> keep the place dusted.
Except that the dust on the moon has a characteristic that makes such a
task problemmatic: There is no moisture, and so the dust is extremely
clingy. Ask an apollo astronaut of the difficulties they faced with moon
dust.
George
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Date: 11 Jul 2007 20:09:37
From: John Nichols
Subject: Re: want some hints on this topic....
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"Howard Lester" <hlester@mmto.org > wrote in message
news:f73b9a$k7h$1@onion.ccit.arizona.edu...
>
> "John Nichols" wrote
>
>>>>I agree. The moon is very difficult to maintain.
>
>> There is that dust issue, though.
>
> Easy: broom, dust pan, garbage can. Or, send my mother up there -- she'll
> keep the place dusted.
>
:)
What some guys won't do to get away from their mother. ; >
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Date: 11 Jul 2007 15:07:02
From: Howard Lester
Subject: Re: want some hints on this topic....
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"John Nichols" wrote
>> Easy: broom, dust pan, garbage can. Or, send my mother up there -- she'll
>> keep the place dusted.
>>
>
> :)
>
> What some guys won't do to get away from their mother. ;>
Hey, I tried! My brother told me I should have moved to Alaska instead of
to Arizona.
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Date: 12 Jul 2007 00:57:19
From: John Nichols
Subject: Re: want some hints on this topic....
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"Howard Lester" <hlester@mmto.org > wrote in message
news:f73ka7$ml2$1@onion.ccit.arizona.edu...
>
> "John Nichols" wrote
>
>>> Easy: broom, dust pan, garbage can. Or, send my mother up there --
>>> she'll keep the place dusted.
>>>
>>
>> :)
>>
>> What some guys won't do to get away from their mother. ;>
>
> Hey, I tried! My brother told me I should have moved to Alaska instead of
> to Arizona.
>
And _where_ does he live, hmmm?
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Date: 11 Jul 2007 13:19:14
From: George
Subject: Re: want some hints on this topic....
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"Sam Wormley" <swormley1@mchsi.com > wrote in message
news:F_7li.8502$Xa3.3749@attbi_s22...
> enigma wrote:
>> astronomical observatory at moon surface vis-a vis low earth orbiting
>> observatory.....give your ideas....and help...i want it urjently....
>>
>
> A given telescope is less costly to deploy, operate and maintain
> in LEO as opposed to the moon.
Spitzer appears to be doing well. Isn't it about 2 million miles out?
George
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