ROYAL ASTRONOMICAL SOCIETY PRESS INFORMATION NOTE
Date: 2 February 1999
Ref. PN 99/04
RAS Space Science Advisor.
10 Harrier Close,
Surrey, GU6 7BS,
Phone: +44 (0)1483-268672
Fax: +44 (0)1483-274047
INFORMATION ON CONTACTS AND ILLUSTRATIONS IS GIVEN AT THE END OF THIS
UNIVERSITY OF KENT ON A WILD COMET CHASE!
A UK-built experiment will soon be heading towards Comet Wild 2
(pronounced "Vilt-2") as part of NASA's exciting STARDUST mission.
Professor Tony McDonnell and Dr. Mark Burchell from the University of
Kent will be among the scientists at the Kennedy Spaceflight Centre in
Florida who are eagerly anticipating the forthcoming mission to capture
and return a sample of cometary material.
Stardust is currently set for launch on Saturday, February 6. After a
five year voyage to reach its target, Stardust will fly past the comet
in January 2004. Approaching at a speed of 6 km/s (14,000 mph),
Stardust will capture the tiny dust particles that make up the comet's
tail, eventually returning them to Earth in January 2006. In order to
avoid damaging the fragile particles, panels of aerogel - sometimes
called 'solid smoke' because of its extreme lightness - will be exposed
to the dust stream and used to entrap them.
The overall dust environment around the comet will also be studied in
detail. One of the instruments used to measure the characteristics of
this dust is a sensitive dust detection system.
This Large Area Momentum Sensor (LAMS) is mounted on Stardust's front
bumper shield. The circular shield, which consists of three layers, is
used to protect the vulnerable spacecraft from high speed impacts. At
the rear of the shield is a set of microphones, designed by Kent in
collaboration with the University of Chicago. These will listen to the
'sound' of the dust particles as they strike the spacecraft.
The microphone attached to the back of the external aluminium layer
will record impacts from smaller particles. Larger grains which
penetrate the aluminium will be detected by a second microphone fixed
to a layer of Nextel cloth. The number of impacts on the shield will be
counted from the number of electrical pulses picked up by the Kent
sensors, while the voltage of each pulse will enable particle mass to
UKC team member Dr. Mark Burchell said, "Using the special facilities
in our laboratory, we have been able to recreate the high speed impacts
on a mock-up of the Stardust spacecraft. This allowed us to test the
microphones which will 'listen' to the impacts on the real spacecraft
as it flies past the comet."
Dust particles ejected by comets are thought to have been preserved in
almost pristine condition since our Solar System formed some
4,600,000,000 years ago. Professor Tony McDonnell, Director of the
Unit for Space Sciences, pointed out that "since comets are probably
the most primitive objects in our Solar System, this is a very
important mission which will greatly extend our understanding of them
and of the conditions out of which our Solar System developed".
Also involved in the team is postgraduate student Bryan Vaughan, who
will be basing his doctorate thesis on the University of Kent Stardust
The University of Kent involvement with this NASA mission is funded by
a grant from PPARC, the UK Particle Physics and Astronomy Research
Stardust is a prelude to an even more ambitious European Space Agency
mission called Rosetta. A number of UK groups are involved in this
mission, including the University of Kent, the Open University, and
Rutherford Appleton Laboratory. Scheduled for launch in 2003, Rosetta
will actually land a probe on the surface of a comet, but not until the
Stardust will be the first spacecraft ever to bring cometary material
back to Earth for analysis by scientists worldwide. Its main objective
is to collect return particles flying off the nucleus of Comet Wild-2.
It will also bring back samples of interstellar dust, including the
recently discovered dust streaming into the Solar System from other
stars. Ground-based analysis of these samples after their return in
January 2006 should yield important insights into the evolution of the
Sun and planets, and possibly into the origin of life itself.
Other objectives are to take pictures of the comet, count the comet
particles striking the spacecraft, and produce real-time analyses of the
composition of the material ejected by the comet.
Stardust is the fourth of NASA's low-cost Discovery missions.
Prof. Tony McDonnell: (001) 407-783-2230
Dr. John Zarnecki, +44 (0)1227-823237 Fax (for all) +44 (0)1227-62616
Dr. Simon Green, +44 (0)1227-823780 E-mail: S.F.Green@ukc.ac.uk
Dr. Neil McBride, +44 (0)1227-827654 E-mail: N.McBride@ukc.ac.uk
Unit for Space Sciences and Astrophysics Office, +44 (0)1227-459616
Further details can be found on the World Wide Web as follows:
UKC STARDUST Home Page: http://wwwspace.ukc.ac.uk/stardust.html
UKC Space Activities: http://wwwspace.ukc.ac.uk/
NASA STARDUST Home Page: http://stardust.jpl.nasa.gov/