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Emergence of the tenth planet

机译:第十颗行星的出现

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After a prolonged debate and suspense, Pluto was accepted as the ninth planet orbiting around the sun1'2. One of the major difficulties in the recognition of Pluto as the ninth planet going round the sun was its non-concentric orbit that did not conform to the general trend of elliptical motion of the eight planets discovered earlier, as shown in Figure 1. Scientific efforts for exploring the Kuiper belt continued and two more objects, 2005FY9 and 2003EL61, of somewhat smaller sizes were found. The recently discovered third object, known as KBO 2003UBS 13, is larger in size compared to earlier discov-ered nonconcentric planets3. A debate of the International Astronomical Union (IAU) was scheduled to be held on 24 August 2006 for taking appropriate decision about non-concentric orbits of planets. We sent our proposal by 11 August 2006 for reclassification: eight planets to be placed in the first category and Pluto to be placed in a separate category along with 2003 UBS 13, the fourth non-concentricplanet. We also suggested new names based on historical developments of Indian ancient astronomy as 'Aryabhata' or 'Vivekananda'. In the meeting on 24 August 2006, a decision was taken in conformity with our suggestions, to a large extent4. The two smaller objects, namely 2005FY9 and 2003EL61, were not included and the remaining two non-concentric planets, Pluto and 2003UB313, were taken in a separate category of dwarf planets along with Ceres. The General Assembly named object 2003UB313 as Eris and its moon as Dysnomia. Considering the importance of 2003UB313, details were investigated and it was even named as the tenth planet.
机译:经过长时间的辩论和悬念,冥王星被公认为绕太阳1'2绕行的第九颗行星。认识冥王星为第九颗绕太阳旋转的行星的主要困难之一是其非同心轨道,它不符合早先发现的八颗行星的椭圆运动的总体趋势,如图1所示。科学努力为了继续探索柯伊伯带,还发现了另外两个尺寸较小的物体2005FY9和2003EL61。与早先发现的非同心行星相比,最近发现的第三个物体KBO 2003UBS 13更大。原定于2006年8月24日举行国际天文学联盟(IAU)辩论,以就行星的非同心轨道作出适当决定。我们在2006年8月11日之前提出了重新分类的建议:将八颗行星置于第一类,将冥王星与另一类2003 UBS 13置于第四类,这将是另一类。我们还根据印度古代天文学的历史发展建议了新名称“ Aryabhata”或“ Vivekananda”。在2006年8月24日的会议上,很大程度上根据我们的建议做出了决定4。不包括两个较小的天体,即2005FY9和2003EL61,其余两个非同心行星Pluto和2003UB313与谷神星一起被归类为矮行星。大会将物体2003UB313命名为Eris,并将其卫星命名为Dysnomia。考虑到2003UB313的重要性,对其进行了详细调查,甚至被命名为第十颗行星。

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