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| The ] 2005 FY<sub>9</sub> is only provisional. Given the importance of the object and the fact that it may be found on older ]s (]), it may receive a proper name soon. | The ] 2005 FY<sub>9</sub> is only provisional. Given the importance of the object and the fact that it may be found on older ]s (]), it may receive a proper name soon. | ||
| 2005 FY<sub>9</sub> was detected by the ]. Initial estimations gave a diameter of 50% to 75% that of ]. Therefore it is similar in size to 2003 EL<sub>61</sub>, although brighter. This makes it the largest Kuiper belt object after 2003 UB<sub>313</sub> and Pluto. | 2005 FY<sub>9</sub> was detected by the ]. Initial estimations gave a diameter of 50% to 75% that of ]. Therefore it is similar in size to 2003 EL<sub>61</sub>, although brighter. This makes it the largest Kuiper belt object after 2003 UB<sub>313</sub> and Pluto. ] suggested the term ] be used for planetary objects intermediate in size between ] and ], which would include all four of these objects. | ||
| The object orbits the ] every 308 years. Like Pluto's, its ] is somewhat ] and ]. | The object orbits the ] every 308 years. Like Pluto's, its ] is somewhat ] and ]. | ||
Revision as of 10:05, 31 July 2005
The correct title of this article is 2005 FY9. It appears incorrectly here due to technical restrictions.2005 FY9 (also written 2005 FY9) is a very large Kuiper belt object discovered on March 31, 2005 by the team led by Michael Brown. Its discovery was announced on July 29, 2005 on the same day as two other very large trans-Neptunian objects, 2003 EL61 and 2003 UB313.
The designation 2005 FY9 is only provisional. Given the importance of the object and the fact that it may be found on older photographs (precovered), it may receive a proper name soon.
2005 FY9 was detected by the Spitzer space telescope. Initial estimations gave a diameter of 50% to 75% that of Pluto. Therefore it is similar in size to 2003 EL61, although brighter. This makes it the largest Kuiper belt object after 2003 UB313 and Pluto. Isaac Asimov suggested the term mesoplanet be used for planetary objects intermediate in size between Mercury and 1 Ceres, which would include all four of these objects.
The object orbits the Sun every 308 years. Like Pluto's, its orbit is somewhat eccentric and inclined.