97773Re: [sfconsim-l] Earth-Lunar L1 / Diego Garcia
- May 1, 2014the military scope would be a great way to detect the ship ..
and 30 minutes later MP's drag some screaming and kicking astronomers
out of the Keck's control room .. 8-)
seriously - i thing that EVERY large scope on the earth will be pointing
at L1 shortly, ensuring 24 hour coverage .. including cerro paranal for
example - the angular resolution of the VLT is comparable to that of the
Keck (however if they run it in interferometry mode they should be able
to go down to 0,002 arc sec - however i do not know if their software is
set up to recreate pictures form the data they gain that way) ..
Am 30.04.2014 21:17, schrieb Scott M:
> I contacted the communications person for the Keck telescopes in Hawaii
> and asked a few detailed questions. He sent me back the following.
> (note: the ship in question is 1 mile long, about 250 yards wide)
> /L1 for the Earth–Moon system is 345,000 km from the center of the
> Earth, between the Earth and the Moon. At that distance, 1 mile (1.6 km)
> subtends approximately an arc second (arcsec). The median image size at
> WMKO is 0.6 arcsec, so with most of our instruments the length of the
> spacecraft would be barely resolvable./
> /With adaptive optics, of course, we can do much better, 0.055 arcsec,
> for instance. This is enough to be able to tell the shape, for example./
> /Would one or both Keck telescopes be redirected? Maybe. It’s a hard
> question to answer because it has never before occurred. /
> /Note, too, that the Advanced Electro-Optical System Telescope located
> on Haleakala, Maui uses adaptive optics, and could give images of about
> 0.16 arcsec size. Since it is controlled by the Dept. of Defense, it is
> highly likely they would look at such a target./
> On Tue, Apr 29, 2014 at 12:12 PM, Scott M <steppahouse@...
> <mailto:steppahouse@...>> wrote:
> The number of dentists named Macintosh is somewhat surprising, lol.
> On Tue, Apr 29, 2014 at 12:09 PM, eric henry <ehenry0623@...
> <mailto:ehenry0623@...>> wrote:
> Paging Dr Macintosh...
> On Tue, Apr 29, 2014 at 11:38 AM, Scott M <steppahouse@...
> <mailto:steppahouse@...>> wrote:
> I was revisiting this issue as I had some story time-line
> constraints change and was reviewing all data that would be
> affected by that change. One thing occurred to me right
> away, mostly due to research subsequent to this discussion
> from December. The "first-contact" event happens in October
> 2016. Hubble won't be a factor at that point.
> Plus, given the time of day (0730 on the American east
> coast, 0430 on the west coast) Diego Garcia wouldn't see it
> for a couple of hours too late. The original setup had a
> Chinese amateur see it first just after moonrise,
> approximately 1815-1830 (UTC+8...still a lot of light in the
> sky, particularly to the west, but I have to make some
> arbitrary choices somewhere). By the time DG rotates into
> view of the ship, most of the initial flurry of events have
> already taken place.
> I /could/ use the Keck Observatory in Hawaii, but I'm not
> sure how an optical/infrared setup that's designed for deep
> space viewing would handle something that close. Common
> sense says closer=better, but I don't know all the in's and
> out's. I emailed their info office and am waiting on a
> On Tue, Dec 10, 2013 at 11:14 AM, Isaac Kuo
> <mechdan@... <mailto:mechdan@...>> wrote:
> >I think what we're looking at, then, is whether or not
> the U.S. leadership would have first-hand "eyes on"
> without having to rely on other feeds. GEODSS at Diego
> Garcia was the closest I could come up with, assuming
> that Hubble and Spitzer (JPL assets) were on the wrong
> side of the planet to see this thing. I'm assuming the
> latter arbitrarily, although it wouldn't hurt to see
> what Hubble and Spitzer's orbits look like, ie, if they
> are ever actually both blocked from seeing the L1.
> Spitzer is in an Earth trailing orbit, and it can't view
> in any
> direction closer than 80 degrees to the Sun. This means
> for the next 10 years, Spitzer can see everything around
> at any time, except if it's blocked by Earth itself or
> the Moon.
> Due to the inclination of the Moon's orbit, it's really
> that the object would be blocked.
> However, after another 10 years, Spitzer won't be able
> to point
> at Earth at all...and not again until the Earth catches
> up with
> Spitzer (in another 30 years).
> So, you can simply set the story in another 10 years or
> so to
> avoid Spitzer's gaze.
> Hubble, OTOH, is in Earth orbit. It's in a typical prograde
> orbit, circling Earth about once every 1.5 hours. As such,
> Hubble will have a direct line of sight with the object
> within minutes. However, Hubble can't point near the Sun.
> If the object were to appear near the Sun in the sky (new
> Moon), then Hubble wouldn't be able to view it.
> Isaac Kuo mechdan@... <mailto:mechdan@...>
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