Asteroid Lutetia as viewed by the Rosetta spacecraft on July 10, 2010.
Click on image for full size
Image courtesy of ESA 2010 MPS for OSIRIS Team MPS/UPD/LAM/IAA/RSSD/INTA/UPM/DASP/IDA.
Lutetia is a medium-sized asteroid which orbits in the main asteroid belt between the planets Mars and Jupiter. It is officially known as "21 Lutetia" because it was the 21st asteroid discovered. The asteroid was first observed by the German-French astronomer Hermann Goldschmidt from the balcony of his apartment in Paris on November 15, 1852. Lutetia is the Latin name for Paris.
This lumpy object is roughly 96 km (60 miles) in diameter, though it is not quite a sphere. The asteroid measures 132 km (82 miles) along its longest axis and about 76 km (47 miles) along its shortest. The composition of Lutetia is somewhat mysterious; some evidence indicates that it is a metallic asteroid, while other data point to a rocky composition. The material that an asteroid is made of provides clues about the body's formation and history.
The European space probe Rosetta flew past Lutetia on July 10, 2010, giving us our first good look at the asteroid. Lutetia is the largest asteroid visited by a spacecraft to date, and the first M-type asteroid to be seen up close by a space probe. Rosetta passed within 3,160 km (1,964 miles) of the asteroid while travelling at a speed of 15 km/s (9 miles/sec or more than 33,000 mph). Rosetta sent some highly detailed images, as well lots of other data, back to Earth before continuing on its long journey to land on a comet in 2014.
Shop Windows to the Universe Science Store!
Our online store
includes issues of NESTA's quarterly journal, The Earth Scientist
, full of classroom activities on different topics in Earth and space science, ranging from seismology
, rocks and minerals
, and Earth system science
You might also be interested in:
Scientists believe that the solar system was for med when a cloud of gas and dust in space was disturbed, maybe by the supernova of a nearby star. Shock waves from the explosion compressed the cloud of...more
Rosetta is a European space probe that was launched in March 2004. Its primary mission is to rendevous with and land on a comet in November 2014. Along the way it has flown by two asteroids. On July 1...more
Comet 67P/Churyumov-Gerasimenko was discovered in 1969 by Klim Churyumov and Svetlana Gerasimenko. The comet orbits the Sun once every 6.57 years. Its orbit brings it closer to the Sun than Mars at the...more
Toutatis is a very odd asteroid. It appears to be two asteroids that are either loosely stuck together, rolling around against each other, or orbiting very close to one another. The orbit of Toutatis crosses...more
Lutetia is a medium-sized asteroid which orbits in the main asteroid belt between the planets Mars and Jupiter. It is officially known as "21 Lutetia" because it was the 21st asteroid discovered. The asteroid...more