说明: 近年来，人们发现鸟神星(Makemake)是太阳系外围的大天体之一。这个科伊伯带天体的发音为MAH-kay MAH-kay，只比冥王星还小一点，距离太阳比冥王星稍微远一点，亮度也只比冥王星稍暗一些。然而，鸟神星的轨道面与黄道面的倾角却比冥王星要大得多。在2005年Mike Brown (Caltech)发现它之后，便有一个编号为 2005FY9，直到最近才以復活岛的神话中，人类的创造神 Makemake 来命名。此外，鸟神星也被分类至矮行星中的类冥矮行星，这也使得鸟神星成为类冥矮行星中，除了冥王星与鬩神星之外的第三个成员。鸟神星的外观偏红色，光谱的观测指出其表面可能覆盖著甲烷冰。目前仍没有鸟神星表面的照片，因此上面这张原本用来描绘赛德娜的艺术家想像图便直接拿来描绘鸟神星。在它与太阳之间的则是想像的卫星。
转自成大
Makemake of the Outer Solar System
Credit: R. Hurt (SSC-Caltech), JPL-Caltech, NASA
Explanation: Recently discovered Makemake is one of the largest objects known in the outer Solar System. Pronounced MAH-kay MAH-kay, this Kuiper belt object is only slightly smaller than Pluto, orbits the Sun only slightly further out than Pluto, and appears only slightly dimmer than Pluto. Makemake, however, has an orbit much more tilted to the ecliptic plane of the planets than Pluto. Designated 2005 FY9 soon after its discovery by a team led by Mike Brown (Caltech) in 2005, the outer Solar System orb was recently renamed Makemake for the creator of humanity in the Rapa Nui mythology of Easter Island. Additionally, Makemake has been recently classified as a dwarf planet under the new subcategory plutoid, making Makemake the third cataloged plutoid after Pluto and Eris. Makemake is known to be a world somewhat red in appearance, with spectra indicating it is likely covered with frozen methane. Since no images of Makemake's surface yet exist, an artist's illustration originally meant to depict Sedna has been boldly co-opted above to now illustrate Makemake. A hypothetical moon is visualized above nearly in the direction of our distant Sun.
[ 本帖最后由 Eldghost 于 2008-7-18 10:08 编辑 ] |
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