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Dátum: 2005-07-30 06:15:44
Feladó: Szöllősi Attila
Tárgy: Fw: {MPML} Scientists Discover Tenth Planet (2003 UB313)
----- Original Message -----
From: "Ron Baalke"
To: "Minor Planet Mailing List"
Sent: Saturday, July 30, 2005 2:19 AM
Subject: {MPML} Scientists Discover Tenth Planet (2003 UB313)

> http://www.nasa.gov/home/hqnews/2005/jul/HQ_05209_10th_Planet.html
> Dolores Beasley
> Headquarters, Washington
> (Phone: 202/358-1753)
> Jane Platt/Gay Hill
> Jet Propulsion Laboratory
> (Phone: 818-354-0880/0344)
> July 29, 2005
> RELEASE: 05-209
> Scientists Discover Tenth Planet
> A planet larger than Pluto has been discovered in the outlying regions
> of the solar system.
> The planet was discovered using the Samuel Oschin Telescope at Palomar
> Observatory near San Diego, Calif. The discovery was announced today by
> planetary scientist Dr. Mike Brown of the California Institute of
> Technology in Pasadena, Calif., whose research is partly funded by NASA.
> The planet is a typical member of the Kuiper belt, but its sheer size in
> relation to the nine known planets means that it can only be classified
> as a planet, Brown said. Currently about 97 times further from the sun
> than the Earth, the planet is the farthest-known object in the solar
> system, and the third brightest of the Kuiper belt objects.
> "It will be visible with a telescope over the next six months and is
> currently almost directly overhead in the early-morning eastern sky, in
> the constellation Cetus," said Brown, who made the discovery with
> colleagues Chad Trujillo, of the Gemini Observatory in Mauna Kea,
> Hawaii, and David Rabinowitz, of Yale University, New Haven, Conn., on
> January 8.
> Brown, Trujillo and Rabinowitz first photographed the new planet with
> the 48-inch Samuel Oschin Telescope on October 31, 2003. However, the
> object was so far away that its motion was not detected until they
> reanalyzed the data in January of this year. In the last seven months,
> the scientists have been studying the planet to better estimate its size
> and its motions.
> "It´s definitely bigger than Pluto," said Brown, who is a professor of
> planetary astronomy.
> Scientists can infer the size of a solar system object by its
> brightness, just as one can infer the size of a faraway light bulb if
> one knows its wattage. The reflectance of the planet is not yet known.
> Scientists can not yet tell how much light from the sun is reflected
> away, but the amount of light the planet reflects puts a lower limit on
> its size.
> "Even if it reflected 100 percent of the light reaching it, it would
> still be as big as Pluto," says Brown. "I´d say it´s probably one and a
> half times the size of Pluto, but we´re not sure yet of the final size.
> "We are 100 percent confident that this is the first object bigger than
> Pluto ever found in the outer solar system," Brown added.
> The size of the planet is limited by observations using NASA´s Spitzer
> Space Telescope, which has already proved its mettle in studying the
> heat of dim, faint, faraway objects such as the Kuiper-belt bodies.
> Because Spitzer is unable to detect the new planet, the overall diameter
> must be less than 2,000 miles, said Brown.
> A name for the new planet has been proposed by the discoverers to the
> International Astronomical Union, and they are awaiting the decision of
> this body before announcing the name.
> For more information on the discovery and to view images, visit:
> http://www.nasa.gov/vision/universe/solarsystem/newplanet-072905-images.html
> For information about NASA and agency programs on the Web, visit:
> http://www.nasa.gov/home/index.html
> - end -
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