(5479) Grahamryder Main-belt Asteroid

Discovered on 30 October 1989 by S. J. Bus at Cerro Tololo.

Graham Ryder (1949-2002) was a U.S. lunar scientist who pioneered several important concepts about the moon and its evolution. He was among the first to recognize evidence in the lunar sample collection that mare volcanism began very early in lunar history, before the period of late heavy bombardment had ended.Naming citation (20020624/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL

Where Grahamryder is today

Seen from above the solar system on 2026-10-14: Grahamryder is 2.09 au from the Sun and 1.18 au from Earth. Computed from JPL's orbital elements.

Facts

Number	5479
Provisional designation	1989 UT5
Orbit class	Main-belt Asteroid
Diameter	5.78 km (#9,250 largest of 17,440 named asteroids with a measured size)
Albedo	0.304
Rotation period	7.60 hours
Absolute magnitude (H)	13.38
Orbital period	4.13 years
Semi-major axis	2.58 au
Perihelion – aphelion	2.01 – 3.14 au
Eccentricity	0.218
Inclination	13.5°
Closest distance between its orbit and Earth's (MOID)	1.04 au

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

Also named after someone called Graham

All asteroids named after someone called Graham

Also discovered on 30 October 1989

More named asteroids discovered by S. J. Bus

All 464

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