Enigmatic Kuiper Object Quaoar Might Be Outgassing

OUTERPLANETS

Quaoar by Hubble

Moscow, Russia (UPI) Dec 08, 2004
A giant rock spotted on the fringes of the Solar System has frozen water crystals on its surface, an intriguing discovery that suggests it may harbour volcanic activity, a study says.

The object, dubbed Quaoar, inhabits the Kuiper Belt, an area beyond the orbit of Neptune that is dotted with rubble left over from the building of the Solar System.

Quaoar has a diameter of about 1,300 kilometers (800 miles), making it about half the size of Pluto, the most distant planet from the Sun.

In a study published on Thursday in the British journal Nature, US astronomers David Jewitt and Jane Luu of the Institute for Astronomy in Hawaii and the Massachusetts Institute of Technology (MIT) say Quaoar has crystalline water on its surface, and possibly ammonia too.

That finding, derived by infrared photography, is a surprise, for the Kuiper Belt is so far from the Sun that the temperature there is less than 50 C (90 F) above absolute zero (-273 C, -459 F).

Crystalline ice is thought to form at 100 C (180 C F) above absolute zero.

Jewitt and Luu conclude that the ices may have been in Quaoar's interior and were exposed by an impact with another rock that smashed away part of its surface.

Alternatively, the ices could have been formed by outgassing from a volcano, they theorise.

Quaoar (pronounced kwah-o-wahr), spotted in 2002, was named in honour of the Tongva people who inhabited southern California before the arrival of Europeans.

In their creation mythology, Quaoar is a primeval force who, by singing and dancing, creates the deities.

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OUTERPLANETS

Pluto-Spitzer Astronomers Say KBO's May Be Smaller Than Thought

Pasadena CA (JPL) Nov 11, 2004
Pluto's status as our solar system's ninth planet may be safe if a recently discovered Kuiper Belt Object is a typical "KBO", and not just an oddball. Astronomers have new evidence that KBOs (Kuiper Belt Objects) are smaller than previously thought.

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