PLEASE NOTE:
*
From: Benny J Peiser B.J.PEISER@livjm.ac.uk
Subject: CC DIGEST, 18/02/98
To: cambridge-conference@livjm.ac.uk
Priority: NORMAL
CAMBRIDGE-CONFERENCE DIGEST, 18 February 1998
---------------------------------------------
(1) INTERNATIONAL CONFERENCE ON 90TH ANNIVERSARY OF TUNGUSKA
EVENT
Bas van Geel vangeel@bio.uva.nl
(2) ROTATIONAL PROPERTIES OF MAIN BELT ASTEROIDS
M. Florczak et al., PARIS OBSERVATORY
(3) WHAT MAKES COMETS AND ASTEROIDS TICK?
M. DiMartino et al., TORINO OBSERVATORY
(4) THE CHALLENGE AHEAD: CREATING THE FUTURE SPACE DRIVE
M.G. Millis, NASA, LEWIS RESEARCH CENTER, CLEVELAND, OH, 44135
(5) DETERMINING THE PARAMETERS OF FRAGMENTING METEOROIDS
G.G. Novikov et al. ACADADEMY OF SCIENCE OF THE CZECH REPUBLIC,
=====================================
(1) INTERNATIONAL CONFERENCE ON 90TH ANNIVERSARY OF TUNGUSKA
EVENT
From: Bas van Geel vangeel@bio.uva.nl
Dear Benny,
In EOS (Transactions American Geophysical Union vol. 79, number
5,
February 3, 1998 I found under Meeting Announcements:
June 27-30, 1998: 90th Anniversary of the Tunguska Program,
Krasnoyarsk, Russia. Sponsors: Russian Academy of Science; Fund
of
the Development of the Lower Angara-River Region; Tomsk State
University; others. (Organizing Committee, Krasnoyarsk 660017,
Russia; tel. +7-3912-296-998; fax +7-3912-296-995; e-mail
root@n-angara.krasnoyarsk.su; Internet: http://www.tm.ru/tunguska)
This conference will summarize the 90 years of research on the
1908 Tunguska event and discuss past and present roles of other
Tunguska-like events. A field trip to the Tunguska epicenter is
also planned.
So far the announcement in EOS.
Best wishes,
Bas
from: www.tm.ru/tunguska/conference.htm
INTERNATIONAL CONFERENCE
"90-TH ANNIVERSARY OF THE TUNGUSKA PROBLEM"
Krasnoyarsk (Russia), June 27-30, 1998
On June 27, 1998 the International Conference "90-TH
ANNIVERSARY OF
THE TUNGUSKA PROBLEM" is to open in Krasnoyarsk, Russia.
The main purpose of the conference is to summ up the 90 years of
the
research of the 1908 Tunguska event and to discuss a possible
role
of Tunguska-like events in the past and in the future. A trip to
the Tunguska epicenter is also planned.
Because the nature of the Tunguska is still disputable, a priori
there
are no preferable interpretations. All explanations, which are in
agree- ment with facts should be considered.
Because the conference is still in organizational phase, some
minor alterations are possible and so this text will be updated
from time to time.
ORGANIZERS
Presidium of Russian Academy of Science;
Committee on meteorites Russian Academy of Science;
Commission on meteorites and cosmic dust Siberian
branch Russian Academy of Science;
Fund of the development of the lower Angara-river region
Krasnoyarsk);
Tomsk State University;
Sientific research institute of biology and biophysics (Tomsk)
Administration of the Evenk autonomous region;
and many others
CONTRIBUTIONS
Authors wishing to present contributions should submit a 0.5-page
abstract before March 26 to the address listed below.
PROCEEDINGS
The abstracts and the reports are planned to be published in the
Proceedings of the conference.
CORRESPONDENCE
Preferable to be conducted via e-mail as much as possible.
e-mail: root@n-angara.krasnoyarsk.su;
fax: 7+ 3912-296-995;
phones: 7+ 3912-296-998;
7+ 3912-296-113;
post-address:
Russia, 660017,
Krasnoyarsk, ul. Lenina 111,
orgcommittee Tunguska-98;
==================================
(2) ROTATIONAL PROPERTIES OF MAIN BELT ASTEROIDS
M. Florczak*), E. Dotto, M.A. Barucci, M. Birlan, A. Erikson,
M. Fulchignoni, A. Nathues, L. Perret, and P. Thebault:
Rotational
properties of main belt asteroids: photoelectric and CCD
observations of 15 objects. PLANETARY AND SPACE SCIENCE, 1997,
Vol.45, No.11, pp.1423-1435
*) PARIS OBSERVATORY,F-92195 MEUDON, FRANCE
In this paper we present the results of several observational
campaigns carried out during 1996 at the 1.2 m telescope of the
Haute Provence Observatory (France) and at the 1.5 m Danish, 0.9
m
Dutch, 0.6 m Bochum and 0.5 m telescopes of the European Southern
Observatory (ESO, La Silla, Chile), in order to enlarge the
available sample of know asteroid rotational periods. A total of
64 single night lightcurves for 15 asteroids were obtained. The
rotational periods have been determined for 12 objects, with
different quality code: 424 Gratia (P-syn = 19.47 h), 440
Theodora
(P-syn = 4.828 h), 446 Aeternitas (P-syn = 15.85 h), 491 Carina
(P-syn = 14.87 h), 727 Nipponia (P-syn = 4.6 h), 732 Tjilaki
(P-syn = 12.34 h), 783 Nora (P-syn = 34.4 h), 888 Parysatis
(P-syn
= 5.49 h), 1626 Sadeya (P-syn = 3.438 h), 2209 Tianjin (P-syn =
9.47 h), 2446 Lunacharsky (P-syn = 3.613 h) and 3776 Vartiovuori
(Psyn = 7.7 h). For 1246 Chaka, 1507 Vaasa and 1994 Shane the
complete rotational phase was not covered and for two of them it
was possible to find only an indication of the rotational period.
(C) 1997 Elsevier Science Ltd. All rights reserved.
============================
(3) WHAT MAKES COMETS AND ASTEROIDS TICK?
M. DiMartino*), A. Carusi, E. Dotto, M. Lazzarin, F. Marzari, and
E. Migliorini: Dynamical and physical properties of
comet-asteroid
transition objects. ASTRONOMY AND ASTROPHYSICS, 1998, Vol.329,
No.3, pp.1145-1151
*) ASTRONOMICAL OBSERVATORY OF TORINO, I-00025 PINO TORINESE,
ITALY
In the last few years it has been pointed out that, from both
physical and dynamical point of view, it is becoming more and
more
difficult to distinguish comets from asteroids and indeed there
are some examples of small bodies first designated as comets
which
had, later, to be reclassified as asteroids and vice versa
(Hartmann et al., 1990; McFadden, 1994). In order to investigate
the evolutionary path of comets and asteroids in terms of both
dynamical and physical properties, we performed spectroscopic
observations of three objects discovered between 1990 and 1995 -
(6042) 1990 WW2, (6144) 1994 EQ(3), and 1995 QY(2) - and analyzed
their orbital evolution. Obtained spectra show the typical trend
of low-albedo, 'primitive' objects, similar to those of
outer-belt
asteroids and comet nuclei. The dynamical analysis shows that
(6042) 1990 WW2 is on a stable orbit with a typical asteroidal
behavior; (6144) 1994 EQ(3) is on a Jupiter-crossing chaotic
orbit
and in the past could have spent some time in a Jupiter's
horsehoe
orbit; 1995 QY(2) is a Mars crosser and librates about the 15/7
resonance with Jupiter and has a 40% chance to make a transition
from asteroid to comet orbit over a timescale of about 3-5 x
10(5)
yr. Copyright 1998, Institute for Scientific Information Inc.
===========================
(4) THE CHALLENGE AHEAD: CREATING THE FUTURE SPACE DRIVE
M.G. Millis: Challenge to create the space drive. JOURNAL OF
PROPULSION AND POWER, 1997, Vol.13, No.5, pp.577-582
NASA, LEWIS RESEARCH CENTER, CLEVELAND, OH, 44135
To travel to our neighboring stars as practically as envisioned
by
science fiction, breakthroughs in science are required. One of
these breakthroughs is to discover a self-contained means of
propulsion that requires no propellant. To chart a path toward
such a discovery, seven hypothetical space drives are presented
to illustrate the specific unsolved challenges and associated
research objectives toward this ambition. One research objective
is to discover a means to asymmetrically interact with the
electromagnetic fluctuations of the vacuum. Another is to develop
a physics that describes inertia, gravity, or the properties of
space-time as a function of electromagnetics that leads to using
electromagnetic technology for inducing propulsive forces.
Another
is to determine if negative mass exists or if its properties can
be synthesized, An alternative approach that covers the
possibility that negative mass might not exist is to develop a
formalism of Mach's principle or reformulate ether concepts to
lay
a foundation for addressing reaction forces and conservation of
momentum with space drives. Copyright 1998, Institute for
Scientific Information Inc.
=================================
(5) DETERMINING THE PARAMETERS OF FRAGMENTING METEOROIDS
G.G. Novikov*), P. Pecina and N.A. Konovalova: The determination
of
the parameters of fragmenting meteoroids. ASTRONOMY AND
ASTROPHYSICS,
1998, Vol.329, No.2, pp.769-775
*) ACADADEMY OF SCIENCE OF THE CZECH REPUBLIC, INSTITUE OF
ASTRONOMY, CS-25165 ONDREJOV, CZECH REPUBLIC
Taking into account the quasi-continuous fragmentation of meteor
particles, the formulae describing the variation of both light
and
ionization along the atmospheric trajectory of meteoroids, are
derived. Two methods of data processing are presented enabling
the
determination of the parameters of quasicontinuous fragmentation,
R-0, and
R-1, characterizing the parent body and the fragmentation
products, as well
as the bulk density of the parent meteoroid from the light and/or
ionization
curve. The use of these methods is shown by means of two examples
of
processing of model curves. Copyright 1998, Institute for
Scientific
Information Inc.
--------------------------------
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