Wikipedia
Hirayama (written: 平山) is a Japanese surname. Notable people with this surname include:
- Aya Hirayama - an actress
- Hideyuki Hirayama - a film director
- Ikuo Hirayama - a painter
- Kiyotsugu Hirayama, who discovered the Hirayama families of asteroids
- Kōji Hirayama - a politician
- Satoshi Hirayama - a Japanese-American baseball player
- Shin Hirayama, the first Japanese astronomer to discover an asteroid
- Sōta Hirayama - an international football (soccer) player
- Tomonori Hirayama, football player
- Yu Hirayama - a badminton player
- Yuji Hirayama - a rock climber
Hirayama can also refer to:
- 1999 Hirayama - an asteroid
- Hirayama (crater) - a luner crater
- Hirayama family - a family of asteroids
- Hirayama Station - a train station in Chiba Prefecture
- Hirayama syndrome - a lower motor neuron disease
Hirayama is a large lunar impact crater that is located on the far side of the Moon, just beyond the eastern limb. This region of the surface is sometimes brought into view from Earth during periods of favourable libration. However it is best viewed from orbit. This crater is located along the southeastern edge of the Mare Smythii, to the northeast of the crater Brunner. To the northeast of Hirayama is Wyld.
This is a worn and eroded crater with multiple impacts overlapping the outer rim and the interior floor. Hirayama K has broken across the rim to the southeast and Hirayama C crosses the northeastern rim. Along the southwestern outer edge is Hirayama Q. The small Hirayama T is located along the western inner wall, and attached to its eastern edge is Hirayama S. The crater Hirayama Y is adjacent to the northern inner walls of Hirayama and covers a significant part of the northern interior floor. Several smaller craters lie within the floor, including Hirayama N in the south. The floor otherwise forms a relatively level surface within the inner wall.