魍魉 发表于 2011-2-14 21:25 http://www.astronomy.com.cn/bbs/images/common/back.gif
LS说的也有道理~！ 还是等真正能观测到的时候再说“发现”吧，否则难免又是只“周老虎”:sleepy: ...以前不是说啥nibiru啥的.... 难道就是这...
魍魉 发表于 2011-2-14 21:25 http://www.astronomy.com.cn/bbs/images/common/back.gif
建议用这个名称额(⊙o⊙)…看看MK们还起什么名字::070821_13.jpg:: 早有传言说有这么个东西
不过都是推测啊 淡定，淡定，别急着下结论！
::070821_06.jpg:: 找到大概方位后，如果哈勃或其他望远镜再观测无误，那就是真的了 找到大概方位后，如果哈勃或其他望远镜再观测无误，那就是真的了
txdtj 发表于 2011-2-16 09:59 http://www.astronomy.com.cn/bbs/images/common/back.gif
奥尔特云内的巨行星。。。现有的光学望远镜能直接看到吗？ 还远远不能说"发现"了吧 转一段喂鸡上的东西
Tyche is the nickname given to a possible gas giant located in the outer Oort cloud of the solar system. Astronomers John Matese and Daniel Whitmire of the University of Louisiana at Lafayette claimed in 2011 that evidence of this object would be detectable in the archive of data that was collected by NASA's Wide-field Infrared Survey Explorer (WISE) telescope, but the two have said that more analysis of the WISE data is required to determine if such a world exists or not
History
Matese and Whitmire first proposed the existence of this planet in 1999, based on a perceived bias in the points of origin for long-period comets. Rather than arriving from random points across the sky as is commonly thought, Matese and Whitmire concluded that they were in fact clustered in a band inclined to the ecliptic. Such clustering could be explained if they were disturbed by an unseen object at least as large as Jupiter, possibly a brown dwarf. The hypothetical planet—or companion of the Sun—would be located in the outer part of the Oort cloud. They suggest that such an object might also explain Sedna's peculiar orbit. However, their sample size was small and the results were inconclusive.
Orbit
The orbit of the possible new planet is speculated to lie at approximately 500 times Neptune's distance; equivalent to 15,000 AU (2.2×1012 km; 1.4×1012 mi) from the Sun, a little over one-fourth of a light year. This is still well within the Oort cloud, whose boundary is estimated to be beyond 50,000 AU. It would have an orbital period of roughly 1.8 million years.
Mass
The discoverers speculate that Tyche could be up to four times the mass of Jupiter and have a relatively high temperature of approximately 200 Kelvin (-73°C), due to residual heat from its formation. With a mass of four times the mass of Jupiter, it would still be too small to be a brown dwarf, the ignition of which requires an astronomical object to possess a mass of at least 13 Jupiter masses.
Origin of name
In ancient Greek city cults, Tyche (Τύχη, meaning "fortune" or "luck" in Greek) was the presiding tutelary deity that governed the fortune and prosperity of a city, its destiny (Roman equivalent: Fortuna). The use of the name "Tyche" for the planet may also be a reference to an earlier theory of the Solar System's structure that involved the Sun having a dim companion named Nemesis as it was proposed as a cause for mass-extinctions on Earth. Tyche was the name of the sister of Nemesis. 那么远的地方还能形成这么巨大的行星么？ 奥尔特云只是个假说而已！况且上面刚才说是太阳系外！就算真的有，你有百分之几的把握保证那是太阳系的行星？？如果那颗星只是一种人类每见过的不属于行星的星呢？？？ 这么远的距离用哈勃恐怕不行了，还得等詹姆斯韦伯上阵吧 搜狐的。。还是洗洗睡吧。。
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