ภาพ:2003 UB313-Moon.jpg

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2003_UB313-Moon.jpg (65KB, MIME type: image/jpeg)

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Reason for deletion request: Claim of PD-NASA image is not verifyable. No trace of this image can be found on the NASA frontpage that is specified as the source for this image. Actually, the source seems the be http://www2.keck.hawaii.edu/optics/staff/mvandam/gabrielle.html (full image at http://www2.keck.hawaii.edu/optics/staff/mvandam/images/xena.jpg), withe the image converted from a negative (brights sky, dark object) to a positive (darks sky, bright obejct). Images from the Keck Observatory website, however, are not released under a free license, see [2]. --Vesta 14:58, 18 September 2006 (UTC)


Description

During 2005, the adaptive optics team at the Keck telescopes in Hawaiʻi carried out observations of the four brightest Kuiper belt objects (Pluto, Template:Mp, Template:Mp, and Template:Mp), using the newly commissioned laser guide star adaptive optics system. Observations taken on 10 September revealed a moon in orbit around Template:Mp, provisionally designated Template:Mpm-. In keeping with the "Xena" nickname already in use for Template:Mp, the moon was nicknamed Gabrielle by its discoverers, after the television warrior princess's sidekick. As with the "Xena" name, this is purely informal and it is expected another official name will be chosen for the moon, depending upon the final decided status of Template:Mp.

The satellite is about 60 times fainter than Template:Mp, and its diameter is estimated to be approximately eight times smaller. Its orbital period is currently crudely estimated to be about two weeks (14 days), but further observations to be made with the Keck telescope in August 2006 will allow a much better measurement on the period. Once astronomers refine the period and the semimajor axis of the satellite's orbit (currently estimated at 36,000 km[1]), they will be able to determine the mass of the system.

Astronomers now know that three of the four brightest Kuiper belt objects (KBOs) have satellites, while among the fainter members of the belt only about 10% are known to have satellites. This is believed to imply that collisions between large KBOs have been frequent in the past. Impacts between bodies of the order of 1000 km across would throw off large amounts of material which would coalesce into a moon. A similar mechanism is believed to have led to the formation of Earth's own Moon when the Earth was struck by a giant impactor early in the history of the solar system.

Source

http://www.nasa.gov/

Date
Author

Keck

Permission
Public domain This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA copyright policy page or JPL Image Use Policy).

Warnings:

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  • Materials from the Hubble Space Telescope may be copyrighted if they do not explicitly come from the STScI. [3]
  • All materials created by the SOHO probe are copyrighted and require permission for commercial non-educational use. [4]
  • Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [5]

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