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Mon, 3 Dec 1990 01:36:22 -0500 (EST)
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Date: Mon, 3 Dec 1990 01:35:47 -0500 (EST)
Subject: SPACE Digest V12 #612
SPACE Digest Volume 12 : Issue 612
Today's Topics:
sts35 orbital data
Galileo's Earth-Moon Encounter Set for December 8
Re: Visual Observation of Galileo
Re: Naive HST question
Re: Visual Observation of Galileo
Re: HST images via anonFTP and SPAN/HEPnet
Re: Translunar/interplanetary shuttle?
Re: HST images via anonFTP and SPAN/HEPnet
Re: Total Solar Eclipses
Re: $$/pound of Freedom vs LLNL (was: ELV Support...)
Re: HST images via anonFTP and SPAN/HEPnet
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------------------------------
Date: 30 Nov 90 18:47:53 GMT
From: acd!fetzer@handies.ucar.edu (Eric Fetzer)
Subject: Galileo's Earth-Moon Encounter Set for December 8
There is an article entitled "Galileo's Earth-Moon Encounter Set for
December 8" in the November 20 _Eos, Transactions of the American Geophysical
Union_. For those not familiar with _Eos_, it is a weekly publication in
newspaper format sent to AGU members. The contents are only slightly more
technical than _Scientific American_.
This article describes the scientific objectives of the encounter. These
include:
-- Imaging and spectral measurements (in IR, visible and UV) of large areas
of the Moon hidden from Earth view.
-- Remote sounding of the Earth's atmosphere, including several previously
unmeasured quantities.
-- Observations of dust and particle properties in local space.
-- A 24 hr movie by the imaging system of the Earth flyby, similar to those
from the Voyagers' flybys of the outer planets.
Despite several decades of observing the Earth and Moon from space and the
ground, many of these measurements will be unique.
Eric Fetzer
fetzer@ncar.ucar.edu
------------------------------
Date: 30 Nov 90 03:26:32 GMT
From: agate!shelby!snorkelwacker.mit.edu!usc!zaphod.mps.ohio-state.edu!lavaca.uh.edu!menudo.uh.edu!lobster!lescsse!gamorris@ucbvax.Berkeley.EDU (Gary A. Morris)
Subject: Re: Visual Observation of Galileo
In <901128.08462687.045202@RMC.CP6> Somers_PW@RMC.CA (Somers_PW) writes:
> Galileo is fast approaching its first Earth flyby. If the
>Sun-Earth-Galileo geometry is right, it should be possible to
>observe the spacecraft. Somewhere on Earth, that geometry
>should be right.
Iberia is your best spot. Warm up your Learjet :-) I was told Iberia
is in Spain, but I can't find it on my map, anyone know where it is?
>Unfortunately, I have been unable to obtain any info
>about its present orbit or near Earth trajectory. Is there anyone
>who could provide heliocentric orbital elements, or better still
>some details of its actual flyby path?
This ASCII diagram below isn't nearly as nice as the diagram I was given
but I hope you get the idea. This is a view looking down at the North
Pole of the Earth. For North America there is really no opportunity to
see Galileo.
"The best place to see Galileo as it does its Earth fly-by is Iberia.
It will be evening twilight there. Observers might see the sunlit side
of Galileo against the dark night sky before it enters Earth shadow.
Observers in the Far East also have a chance to see it as it leaves
Earth shadow, but they will be looking at Galileo's dark side against
the lighter morning twilight sky. It will be early afternoon in
Houston, so we don't have a prayer of seeing it."
| | .
| Earth | +
| Shadow .|
| . |
| . |
|. | 0 = North Pole
.| ***** | 1 = Japan
+ | 1******** | 2 = Houston
. |***********| 3 = Iberia
******0****3*
. ooooooooooooo * = Night side
ooooooooooo o = Day side
ooooo2ooo + = Galileo
ooooo . = Galileo's Trajectory
|
|
V
SUN
In the diagram above, Galileo approaches from the upper right, passes
thru the shadow and departs toward the lower left of the diagram.
Many thanks to JPL for providing the original diagram and information.
--GaryM
--
Gary Morris Internet: lobster!lescsse!gamorris@menudo.uh.edu