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(meteorobs) Excerpts from "CCNet 48/2001 - 27 March 2001"
------- Forwarded Message
From: Peiser Benny <B.J.Peiser@livjm.acdot uk>
To: cambridge-conference <cambridge-conference@livjm.acdot uk>
Subject: CCNet, 27 March 2001
Date: Tue, 27 Mar 2001 12:40:07 +0100
CCNet 48/2001 - 27 March 2001
-----------------------------
"Russian controllers of the Mir space station, which was
successfully burned up in the atmosphere last week and its remains sunk in
the Pacific Ocean, said on Monday they had not revealed the true risks
involved in the operation. [...] Russian specialists had previously
calculated the probabilities of the craft's debris falling on populated
areas but did not publish the information to avoid panic, Semyonov
told the Itar-Tass news agency."
--Business Day, 26 March 2001
[...]
(2) RUSSIANS REVEAL TRUE RISK INVOLVED IN DITCHING MIR
Business Day, 26 March 2001
[...]
(6) EMP [really electrophonic sounds] AND ASTEROID ENTRY
Phil Bland <P.A.Bland@open.acdot uk>
[...]
(12) ANALYSIS OF COMA DUST PROPERTIES IN COMET HALE-BOPP
D.X. Kerola & S.M. Larson
===========================================================================
(2) RUSSIANS REVEAL TRUE RISK INVOLVED IN DITCHING MIR
>From Business Day, 26 March 2001
http://www.bday.co.za/bday/content/direct/1,3523,818610-6080-0,00.html
Russians reveal true risks involved in ditching Mir
RUSSIAN controllers of the Mir space station, which was successfully burned
up in the atmosphere last week and its remains sunk in the Pacific Ocean,
said on Monday they had not revealed the true risks involved in the
operation.
If the final descent of Mir had gone wrong, debris could have fallen in
Europe, Asia, Africa and America, says Yury Semyonov, director of the
Energia space rocket corporation which ran Mir for the Russian government.
Russian specialists had previously calculated the probabilities of the
craft's debris falling on populated areas but did not publish the
information to avoid panic, Semyonov told the Itar-Tass news agency.
Now all had gone smoothly, with remnants of the station hitting the south
Pacific clear of humans in a textbook operation on Friday, Semyonov said
debris would have posed most danger for Latin America, the probability of it
falling there set at 8,6 percent.
The risk of fragments raining on Africa was 8,2 percent and on parts of Asia
was 6,9 per cent.
Probabilities were 1,7 percent for the US, 1,5 percent for Australia, and
0,5 for West Europe.
Russia's Aviation and Space Agency took out a $200-million insurance policy
against any damage or injury caused when the Mir was toppled from its orbit
after 15 years of service.
Russian engineers said before the operation that the chances of successfully
sinking several tons of Mir's remains were 97 to 98 percent. - Sapa-DPA.
) BDFM Publishers 2000
MODERATOR'S NOTE: Before you get overexcited about this apparent case of
Russian cover-up, one should keep in mind that there isn't that much of a
difference between a 91% or a 97% success rate estimate. BJP
===========================================================================
(6) EMP [really electrophonic sounds] AND ASTEROID ENTRY
>From Phil Bland <P.A.Bland@open.acdot uk>
Benny,
On EMP and asteroid entry, see also ELECTROPHONIC SOUNDS FROM THE RE-ENTRY
OF THE MOLNIYA 1-67 SATELLITE OVER AUSTRALIA: CONFIRMATION OF THE
ELECTROMAGNETIC LINK. A. Verveer, P. A. Bland and A. W. R. Bevan,
Meteoritics and Planetary Sciences 35, A163-A164 (2000).
best wishes,
Phil
=============
* ABSTRACTS *
=============
(12) ANALYSIS OF COMA DUST PROPERTIES IN COMET HALE-BOPP
Kerola DX, Larson SM: Analysis of coma dust optical properties in Comet
C/1995 O1 (Hale-Bopp) II. Effects of polarization ICARUS 149: (2) 351-356
FEB 2001
Efforts to apply a single-scattering polarized radiative transfer code to
interpret photopolarimetric measurements of coma dust optical properties in
Comet Hale-Bopp corroborate previous photometrically derived conclusions
concerning the predominance of small sized particles in Hale-Bopp's coma.
Calculations of the degree of linear polarization (DP) as a function of
observation phase angle (alpha) produced by prolate spheroidal crystalline
olivine particles with effective radii (a = 0.216 mum) are compatible with
the comet's measured polarization in standard filters at lambda = 0.4845 and
0.684 mum. Our rudimentary "trade-off" studies highlight the extreme
sensitivity of DP to dust particle size and shape. A combination of viewing
geometry effects in association with enhanced multiple scattering might
provide a quantitative explanation of the negative polarization for 0
degrees less than or equal to alpha less than or equal to 20 degrees seen in
Hale-Bopp and other comets. (C) 2001 Academic Press.
Addresses:
Kerola DX, Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA.
Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA.
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