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- EMBARGOED UNTIL: 11:00 A.M. (EDT)
- JUNE 14, 1995
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- PHOTO RELEASE NO.: STScI-PRC95-26
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- HUBBLE DETECTION OF COMET NUCLEUS
- AT FRINGE OF SOLAR SYSTEM
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- This is sample data from NASA's Hubble Space Telescope that illustrates
- the detection of comets in the Kuiper Belt, a region of space beyond
- the orbit of the planet Neptune. This pair of images, taken with the
- Wide Field Planetary Camera 2 (WFPC2), shows one of the candidate
- Kuiper Belt objects found with Hubble. Believed to be an icy comet
- nucleus several miles across, the object is so distant and faint that
- Hubble's search is the equivalent of finding the proverbial
- needle-in-haystack.
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- Each photo is a 5-hour exposure of a piece of sky carefully selected
- such that it is nearly devoid of background stars and galaxies that
- could mask the elusive comet.
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- The left image, taken on August 22, 1994, shows the candidate comet
- object (inside circle) embedded in the background. The right picture,
- take of the same region one hour forty-five minutes later shows the
- object has apparently moved in the predicted direction and rate of
- motion for a kuiper belt member. The dotted line on the images is a
- possible orbit that this Kuiper belt comet is following. A star (lower
- right corner) and a galaxy (upper right corner) provide a static
- background reference. In addition, other objects in the picture have
- not moved during this time, indicating they are outside our solar
- system.
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- Through this search technique astronomers have identified 29 candidate
- comet nuclei belonging to an estimated population of 200 million
- particles orbiting the edge of our solar system. The Kupier Belt was
- theorized 40 years ago, and its larger members detected several years
- ago. However, Hubble has found the underlying population of normal
- comet-sized bodies.
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- Credit: A. Cochran (University of Texas) and NASA
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