(6859) Datemasamune Inner Main-belt Asteroid

Discovered on 13 February 1991 by M. Koishikawa at Ayashi.

Named in honor of Date Masamune (1567-1636), the Japanese feudal lord who built the Sendai castle in 1601 and established the foundation of Date Clan. He made efforts to increase international relationships and trade with foreign countries, sending a mission led by his retainer Hasekura Tsunenaga to Mexico, Spain and Rome. Sendai will celebrate the 400th anniversary of its founding in 2001.Naming citation (19990202/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL

Where Datemasamune is today

Seen from above the solar system on 2026-10-14: Datemasamune is 1.81 au from the Sun and 2.24 au from Earth. Computed from JPL's orbital elements.

Facts

Number	6859
Provisional designation	1991 CZ
Orbit class	Inner Main-belt Asteroid
Diameter	3.81 km (#13,200 largest of 17,440 named asteroids with a measured size)
Albedo	0.404
Rotation period	5.94 hours
Absolute magnitude (H)	13.93
Orbital period	2.48 years
Semi-major axis	1.83 au
Perihelion – aphelion	1.81 – 1.86 au
Eccentricity	0.0139
Inclination	23.2°
Closest distance between its orbit and Earth's (MOID)	0.805 au

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

Also discovered on 13 February 1991

(11514) Tsunenaga

More named asteroids discovered by M. Koishikawa

All 19

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