太阳系的角动量

The Angular Momentum of the Solar System

摘要: 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。

Abstract: 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.