Rosetta sends back gorgeous asteroid closeups
The European space probe Rosetta passed about 3000 km from the asteroid Lutetia on Saturday, July 10, 2010, and it sent back incredible closeup images of the rock. Check 'em out below!
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Emily Lakdawalla at the Planetary Society Blog has more details, as always.
Related posts:
- Rosetta takes some home pictures
- Rosetta swings past home one final time
- Rosetta swings by Mars
Bad Astronomy Gallery
(click any image to see it full size)
This image, taken at closest approach, shows how battered and worn Lutetia is. Craters pockmark the surface, including several that are many kilometers across. Like the Martian moon Phobos, grooves line the surface, which may be from boulders rolling around, perhaps ejected from some of the craters when they were formed. They may alternatively be stress fractures from impacts; there is still a lively debate over what causes these features in small bodies.
Much of the surface appears smooth, indicating great age for this object. Over billions of years it's been assaulted by dust grains moving at incredible speeds, as well as the solar wind. This has essentially sandblasted the surface, taking - literally - the edge off of the rims of craters.
We have very few high-resolution images of asteroids, and the more we get, the more we learn about them. Given that every now and again we get hit by them, I'm a big fan of understanding them better.
Credit: ESA 2010 MPS for OSIRIS Team. MPS/UPD/LAM/IAA/RSSD/INTA/UPM/DASP/IDA
This series of pictures was taken as Rosetta approached Lutetia.
The first image in the upper left was taken about 9.5 hours before closest approach, when Rosetta was still 510,000 km (315,000 miles) from the asteroid - more distant than the Moon is from the Earth!
The last image (lower right) was obtained an hour and a half before the close encounter when the probe was still 81,000 km (50,000 miles) from Lutetia.
In the first image, details only about 20 km (12 miles) across can be seen, but that improves by almost a factor of 10 in the last image!
Credit: ESA 2010 MPS for OSIRIS Team. MPS/UPD/LAM/IAA/RSSD/INTA/UPM/DASP/IDA
Credit: ESA 2010 MPS for OSIRIS Team. MPS/UPD/LAM/IAA/RSSD/INTA/UPM/DASP/IDA
Credit: ESA 2010 MPS for OSIRIS Team. MPS/UPD/LAM/IAA/RSSD/INTA/UPM/DASP/IDA
Credit: ESA 2010 MPS for OSIRIS Team. MPS/UPD/LAM/IAA/RSSD/INTA/UPM/DASP/IDA
Credit: ESA 2010 MPS for OSIRIS Team. MPS/UPD/LAM/IAA/RSSD/INTA/UPM/DASP/IDA
Credit: ESA 2010 MPS for OSIRIS Team. MPS/UPD/LAM/IAA/RSSD/INTA/UPM/DASP/IDA