Development of a telescope on the moon for investigating the property of the lunar core through rotational fluctuations

通过设置在月球表面的小型望远镜观测月球自转，可以有效地研究月球内部。我们开发了一台小型天顶管(PZT)型望远镜，承担未来的月球任务，将望远镜放在月球上。结果表明，物镜中的衍射镜可以大大放宽精确观测所需的温度条件。考虑到水银表面的振动可能会对观测精度造成严重影响，我们研制了一种可以减小振动对观测精度影响的水银池。

The interior of the Moon can be effectively investigated by observations of the lunar rotation using a small telescope set on the lunar surface. We developed a small telescope of PZT (Photographic Zenith Tube) type, assuming a future lunar mission which will set the telescope on the Moon. It was shown that a diffraction lens in the objective can loosen the temperature condition required for accurate observations very much. We developed a mercury pool which can reduce the effects of vibrations on the observational accuracy, considering the vibration of the mercury surface may cause a serious effect.