Hirayama — is a Japanese surname. Notable people with this surname include two astronomers: * Kiyotsugu Hirayama, who discovered the Hirayama families of asteroids * Shin Hirayama, the first Japanese astronomer to discover an asteroid … Wikipedia
1999 Hirayama — Minor Planet name=1999 Hirayama discoverer=Luboš Kohoutek discovery date=February 27, 1973 designations=1935 GF; 1940 EH; mp|1951 EY|1; 1951 FA; 1965 UF; 1969 NB; 1973 DR; 1975 NE category=Main belt epoch=June 14, 2006 (JD 2453900.5)… … Wikipedia
Kiyotsugu Hirayama — was a Japanese astronomer, best known for his discovery that many asteroid orbits were more similar to one another than chance would allow, leading to the concept of , now called Hirayama families in his honour.Hirayama crater on the Moon is… … Wikipedia
Asteroid family — An asteroid family is a population of asteroids that share similar orbital elements, such as semimajor axis, eccentricity, and orbital inclination. The members of the families are thought to be fragments of past asteroid collisions. General… … Wikipedia
Asteroid — For the arcade video game, see Asteroids (video game). For other uses, see Asteroid (disambiguation). A composite image, to scale, of the asteroids that have been imaged at high resolution. As of 2011 they are, from largest to smallest: 4 Vesta,… … Wikipedia
asteroid — asteroidal, adj. /as teuh royd /, n. 1. Also called minor planet. Astron. any of the thousands of small bodies of from 480 miles (775 km) to less than one mile (1.6 km) in diameter that revolve about the sun in orbits lying mostly between those… … Universalium
Flora family — The Flora family of asteroids is a large grouping of S type asteroids in the inner main belt, whose origin and properties are relatively poorly understood at present. Roughly 4 5% of all main belt asteroids belong to this family.Because of its… … Wikipedia
1918 in science — The year 1918 in science and technology involved some significant events, listed below.Astronomy* Kiyotsugu Hirayama identifies several groups of main belt asteroids, now known as Hirayama families. * Harlow Shapley demonstrates that globular… … Wikipedia
Pleosporales — Temporal range: Eocene–recent … Wikipedia
Social work with groups — Social Work with GroupsThe group process contains the secret of collective life, it is the key to democracy, it is the master lesson for every individual to learn, it is our chief hope for the political, the social, the international life of the… … Wikipedia
