Catch a falling star and find out where it came fromDecember 14, 2010 by Colin Smith in Astronomy & Space / Space Exploration
(PhysOrg.com) -- Scientists are celebrating the discovery of a second meteorite in the Western Australian desert using star gazing cameras. The images from the cameras will reveal the space rocks original orbit in the Solar System.
Meteorites are a geological record of the formation of the Solar System, providing important information about early conditions. Locating where they come from is important, because it enables scientists to link geological information to the correct location in space. However, information about where individual meteorites originated, and how they moved around the Solar System before falling to Earth is rare; we know the origins of only a dozen of around 1100 documented meteorite falls over the past 200 years.
Dr Phil Bland, from the Department of Earth Science and Engineering at Imperial College London, leads the team that found the new meteorite: Meteorites are like ancient jigsaw puzzle pieces. When we find out where one comes from, it is like putting in another tiny piece of the puzzle, providing insights into the workings of our solar system and how it began billions of years ago. We are absolutely over the moon that our camera network has helped us to locate a new meteorite for the second consecutive year.
The cameras each take a time-lapse picture every night, to record any meteorites, which can be identified from the fireballs they form as they travel through Earths atmosphere. Every six weeks, the film is collected by local farmers, who mail the film to the researchers for analysis. If a meteorite fireball is detected on the film, the researchers use complex calculations and climate models to predict what orbit the meteorite was following and where the meteorite is likely to have landed, so that they can retrieve it. The cameras are accurate, enabling the researchers to pinpoint the most recent meteorite to within 150 metres from where it had landed.
This new meteorite, which is the size of a fifty pence piece, was found in the Nullarbor Plain in Western Australia by researchers from Imperial College London, the Ondrejov Observatory in the Czech Republic, and the Western Australian Museum and Curtin University in Perth, Australia. The next step will see the team analysing the space rock to find out more about its chemistry and original orbit.
The researchers hope that the new meteorite will add to the information revealed by the meteorite found in 2009 using the same cameras. This first meteorite was composed of a rare basaltic igneous rock that had broken away from its parent asteroid in the rocky belt between Mars and Jupiter, orbiting the Sun on a similar trajectory to Earth, before crashing into it. Finding the meteorite helped to support the theory that asteroids provided the building blocks for terrestrial planets when the Solar System was forming.
Dr Bland believes that using networks of cameras to locate meteorites on Earth could provide a low-cost alternative to expensive space missions. He explains:
NASA is planning the 2018 OSIRIS-Rex mission, which could see a space probe landing on an asteroid called 1999 RQ36. The hope is to collect and bring the rock back to Earth for analysis. Missions like these are extremely valuable, but there are considerable risks. Research like ours could supplement such missions, by providing a low-cost alternative that can be rapidly deployed around the planet to help us learn more about our Solar System.
Provided by Imperial College London
"Catch a falling star and find out where it came from" December 14, 2010 http://phys.org/news/2010-12-falling-star.html