498 Tokio

498 Tokio (1902 KU) is a main-belt asteroid discovered on 2 December 1902 by Auguste Charlois at the Nice Observatory. Attribution to Astronomer Shin Hirayama of the Azabu Observatory, Tokyo, Japan for the 1900 discovery and naming of Tokio as cited in the 1947 Monthly Newsletter of the Royal Astronomical Society Vol 107, page 45.

Tokio

Discovery
Discovered by	Auguste Charlois
Discovery site	Nice
Discovery date	2 December 1902
Designations
MPC designation	(498) Tokio
Pronunciation	/ˈtoʊkioʊ/
Alternative designations	1902 KU
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	112.09 yr (40942 d)
Aphelion	3.2459283 AU (485.58396 Gm)
Perihelion	2.0591298 AU (308.04143 Gm)
Semi-major axis	2.6525291 AU (396.81271 Gm)
Eccentricity	0.2237107
Orbital period (sidereal)	4.32 yr (1577.9 d)
Mean anomaly	178.62454°
Mean motion	0° 13m 41.327s / day
Inclination	9.493271°
Longitude of ascending node	97.404216°
Argument of perihelion	241.19753°
Physical characteristics
Mean radius	40.915±1.15 km
Synodic rotation period	41.85 h (1.744 d)
Geometric albedo	0.0694±0.004
Absolute magnitude (H)	8.95