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(meteorobs) Excerpts from "CCNet, 15/2000 - 7 February 2000"
------- Forwarded Message
From: Benny J Peiser <b.j.peiser@livjm.acdot uk>
Sender: HUMBPEIS@livjm.acdot uk
To: cambridge-conference@livjm.acdot uk
Subject: CCNet 7 February 2000
Date: Mon, 7 Feb 2000 11:47:03 -0500 (EST)
CCNet, 15/2000 - 7 February 2000
--------------------------------
(1) METEORITE IMPACT ON THE MOON?
Sirko Molau <molau@informatik.rwth-aachendot de>
(2) QUESTIONABLE IMAGE OF A LUNAR IMPACT
Daniel Fischer <dfischer@astro.uni-bonndot de>
[...]
(9) JAPANESE CONTRIBUTION TO METEOROID & DEBRIS MEASUREMENT
H. Yano, INSTITUE OF SPACE & ASTRONAUT SCIENCE
[...]
====================================================
(1) METEORITE IMPACT ON THE MOON?
>From Sirko Molau <molau@informatik.rwth-aachendot de>
Hello friends,
it seems that on Tuesday, January 18, around 18:00 UT a meteorite
impact on the moon was observed visually and photographically by
different amateur astronomers in Germany. A first picture of the event,
which is currently under investigation, was published in several German
newspapers and can be found at
http://www.tickerdot de/archiv2000/02/02/newsmix/story2.html, for example.
It looks like an artifact, but now there seem to be independent
confimations of the event. Have you heard about similar observations at
that time?
Sirko Molau
================================
(2) QUESTIONABLE IMAGE OF A LUNAR IMPACT
>From Daniel Fischer <dfischer@astro.uni-bonndot de>
Dear Benny,
German media are abuzz with an alleged photograph taken by a
Berlin-based amateur astronomer that seems to show a gigantic impact on
the Moon - and the various experts quoted in the articles apparently
haven't looked at it in any detail. To me the 'feature' looks very much
like an optical artefact (a caustic in the widest sense), judging from
a low-resolution wire service version of the picture. It's also amazing
that the media are celebrating this image as the first one ever of a
lunar impact, completely ignoring the Leonid impact flashes that were
videographed after the storm of 1999...
Here are three links to German media stories - the Berlin newspaper
article that started the buzz, and subsequent wire service coverage:
http://www.tagesspiegeldot de/archiv/2000/02/01/ak-be-st-9206.html
http://rp-onlinedot de/wissenschaft/000202/meteorit.shtml
http://www.tickerdot de/archiv2000/02/02/newsmix/story2.html (with the image).
Regards, Daniel
================================
(9) JAPANESE CONTRIBUTION TO METEOROID & DEBRIS MEASUREMENT
H. Yano: Japanese contribution to in-situ meteoroid and debris
measurement in the near Earth space. EARTH PLANETS AND SPACE, 1999,
Vol.51, No.11, pp.1233-1246
INSTITUE OF SPACE & ASTRONAUT SCI,PLANETARY SCI DIV,3-1-1
YOSHINODAI,SAGAMIHARA,KANAGAWA 229851,JAPAN
This paper reviews major results of present studies and recent
developments for future missions in the Japanese space program
regarding in-situ measurement and collection of micrometeoroids
and orbital debris in the near Earth space. Japan's contribution in
this area began with the post flight impact analysis of the Space Flyer
Unit (SFU) satellite which was returned to Earth in 1996 after 10-month
exposure in space. Despite a decade later than similar efforts first
conducted in the USA and Europe, it resulted in a record of over 700
hypervelocity impact signatures, which now forms the nation's first
database of real space impacts being open to public in the Internet.
Together with laboratory impact tests, both morphological and elemental
analyses of the impact craters yielded new insights of the meteoroid to
debris ratio as well as flux variation compared with the previous
spacecraft. The next step was a passive aerogel exposure in the STS-85
shuttle mission in 1997. No hypervelocity impact was found there but
its experience has been incorporated for designing a microparticle
collector to be on-board the Japan Experiment Module-Exposed Facility
of the International Space Station. All of such ''passive'' collection
of micro-impact features, however, still leave the significant
uncertainty in the quest of their origins. Therefore an aerogel-based
''hybrid'' dust collector and detector (HD-CAD) is currently under the
development. It measures time of impact and deduces impactors'
orbital and physical parameters by detecting impact flash while still
capturing them intact. The system is suitable for both (1) sample
return missions in LEO as well as to parent bodies of meteoroids, i.e.,
comets and asteroids, and (2) one-way mission to where the thermal and
plasma environment is such that impact induced plasma detectors may
suffer from significant noise, e.g., a Mercury orbiter and a solar
probe. Together with unambiguous dust samples from a comet by STARDUST
and an asteroid by MUSES-C as references, the HD-CAD in the LEO will be
able to deduce the accretion rates of the cometary and asteroidal dust
grains on the Earth. Copyright 2000, Institute for Scientific
Information Inc.
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