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Old 07-September-2005, 08:01 PM
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Default Largest Asteroid May Be 'Mini Planet' with Water Ice

Hubble Press Release



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Observations of Ceres, the largest known asteroid, have revealed that the object may be a "mini planet," sharing many characteristics of the rocky, terrestrial planets like Earth. Ceres' mantle, which wraps around the asteroid's core, may even be composed of water ice. The observations by NASA's Hubble Space Telescope also show that the asteroid has a nearly round shape like Earth's and may have a rocky inner core and a thin, dusty outer crust. The four Hubble images of Ceres [above] were taken over a 2-hour and 20-minute span, the time it takes the Texas-sized object to complete one quarter of a rotation. One day on Ceres lasts 9 hours. The bright spot that appears in each image is a mystery.
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Old 07-September-2005, 08:05 PM
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That's my secret atomic pile.
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Old 07-September-2005, 08:26 PM
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It is very cool to see these images of Ceres. I'm looking forward to the Dawn mission in a few years which will get a chance to image it closeup.
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Old 08-September-2005, 06:27 PM
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Just a thought, probably off topic.

Have anyonte tried to do interferometry using Hubble coupled with smoething like one of the Kecks? I would hope it can provide improved pictures of Ceres then.

Wondering...
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Old 08-September-2005, 08:41 PM
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That's impossible.

To create an interferometer you must know the distance between the telescopes more accurately than the wavelenght used. In visible light it is nanometers. There is other, worser problems like the fact that you must collect the light of the telescopes in one point with mirrors in extreme accuracy.

Experts may explain it better.

So no optical Earth/space interferometers. On the other hand, true space-borne interferometers are possible.

Radio interferometry is much easier and has been done with satellites.
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Old 08-September-2005, 08:59 PM
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If the manage to build the 100 meter optical telescope (OWLT), it should be able to get fairly sharp images of several of the larger asteroids. By the time it is built, we will have good closeups of Ceres and Vesta from the "Dawn" mission, but Pallas, and several other big ones will still be waiting to be imaged.

On the other hand, asteroids, while being pretty cool to people like us, are probably not that interesting to people assigning telescope time. Notice how long Hubble's been up there, and it's only just now that we get these images of Ceres.
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Old 08-September-2005, 09:54 PM
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It may be fading, but I've been told there used to be a definite caste system in astronomy, with prestige accruing in direct proportion to the distance of the objects being studied. So astronomers studying clusters of galaxies would far "outrank" those who study asteroids.
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Old 08-September-2005, 11:26 PM
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Hubble has studied many Main Belt asteroids as well as Kuiper Belt objects. It has also discovered several moons around them.
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Old 09-September-2005, 06:13 AM
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Quote:
Originally Posted by antoniseb
On the other hand, asteroids, while being pretty cool to people like us, are probably not that interesting to people assigning telescope time. Notice how long Hubble's been up there, and it's only just now that we get these images of Ceres.
Yeah, I've been wondering if they'd ever get around to doing a Ceres set after they released that series of Vesta images showing its rotation...

Very cool.
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Old 09-September-2005, 07:38 AM
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Actually this is at least the second time when Hubble has studied Ceres. Last time it was imaged with the WFPC2 camera. Less details were visible, of course.
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Old 12-September-2005, 03:08 AM
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Ice on asteroids, eh? That would definitely make colonizing the asteroid belt easier.

- Maha "iceteroid" Vailo
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Old 12-September-2005, 08:05 AM
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A white splotch on Ceres? It's gotta be milk.
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Old 12-September-2005, 12:20 PM
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Good. I like milk with my cereal.
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