太阳系的角动量对于太阳系的形成和演化来说是一个非常重要的物理量。以前人们在计算太阳系的角动量时,通常只考虑太阳的自转角动量和八大行星的轨道角动量;这种做法现在看起来有些狭隘和保守。我们用Eggleton’s恒星演化程序来计算太阳的转动惯量,进而求出太阳的自转角动量为1.8838 × 1041 kg∙m2∙s−1。除了太阳的自转角动量和八大行星的轨道角动量,我们还考虑了小行星带、柯伊伯带、奥尔特云、第九大行星和太阳伴星的轨道角动量,算出整个太阳系的角动量为3.3212 × 1045 kg∙m2∙s−1。 The angular momentum of the Solar System is a very important physical quantity to the formation and evolution of the Solar System. Previously, the spin angular momentum of the Sun and the orbital angular momentum of the Eight Giant Planets were only taken into consideration, when researchers calculated the angular momentum of the Solar System. Nowadays, it seems narrow and conservative. Using Eggleton’s code, we calculate the rotational inertia of the Sun. Furthermore, we obtain that the spin angular momentum of the Sun is 1.8838 × 1041 kg∙m2∙s−1. Besides the spin angular momentum of the Sun and the orbital angular momentum of the Eight Giant Planets, we also account for the orbital angular momentum of the Asteroid Belt, the Kuiper Belt, the Oort Cloud, the Ninth Giant Planet and the Solar Companion. We obtain that the angular momentum of the whole Solar System is 3.3212 × 1045 kg∙m2∙s−1.
太阳系,角动量,太阳自转, Solar System Angular Momentum Solar Rotation太阳系的角动量
小行星带主要位于火星和木星轨道之间,虽然数量众多,可是它们的总质量却仅为(或者小于)地球质量的千分之一。小行星的轨道半径都采用小行星主带的平均半径2.65 AU [31] ,小行星距离太阳比较近,轨道椭率一般都不大,我们近似认为小行星都在正圆轨道上绕日公转。根据公式(8),可以算出小行星带的轨道角动量为。
The orbital momentum of the Eight Giant Planets in the Solar Syste
仓荣琴,郭建坡,胡娟秀,何超琼. 太阳系的角动量The Angular Momentum of the Solar System[J]. 天文与天体物理, 2016, 04(02): 33-40. http://dx.doi.org/10.12677/AAS.2016.42004
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