(8500) Hori Main-belt Asteroid

Discovered on 10 October 1990 by Endate, K., Watanabe, K. at Kitami.

Named in honor of Gen-Ichiro Hori (b. 1930), professor emeritus at Tokyo University who gave lectures on celestial mechanics at Tokyo University, Yale University and the University of Texas at Austin. He developed the famous perturbation theory based on Lie transformations that has been adopted by many scientists to solve a set of differential equations by perturbation methods. In fact, his publication on this in 1966 is the most frequently cited paper during the 50-year history of the Publication of the Astronomical Society of Japan. Name proposed by the discoverers, following a suggestion by S. Murayama, K. Hurukawa and A. Fujii, and endorsed by Y. Kozai, K. Aksnes and B. G. Marsden.Naming citation (19981005/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL

Where Hori is today

Seen from above the solar system on 2026-10-14: Hori is 2.64 au from the Sun and 1.85 au from Earth. Computed from JPL's orbital elements.

Facts

Number	8500
Provisional designation	1990 TU
Orbit class	Main-belt Asteroid
Diameter	6.62 km (#8,099 largest of 17,440 named asteroids with a measured size)
Albedo	0.336
Absolute magnitude (H)	13.16
Orbital period	5.20 years
Semi-major axis	3.00 au
Perihelion – aphelion	2.59 – 3.41 au
Eccentricity	0.137
Inclination	12.3°
Closest distance between its orbit and Earth's (MOID)	1.59 au

Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.

Also named after someone called Ichiro

All asteroids named after someone called Ichiro

Also discovered on 10 October 1990

More named asteroids discovered by Endate, K., Watanabe, K.

All 535

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