(5191) Paddack Main-belt Asteroid

Discovered on 13 November 1990 by Ueda, S., Kaneda, H. at Kushiro.

Stephen J. Paddack (b. 1934) is an aeronautical engineer, who was involved with many spacecraft missions, including Cobe, ICE, and ISEE 1, 2 and 3. His research on the effects of radiation pressure contributed significantly towards understanding the Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect.Naming citation (MPC batch dated 2015-06-02), IAU / Minor Planet Center, via NASA/JPL

Where Paddack is today

Seen from above the solar system on 2026-10-14: Paddack is 2.69 au from the Sun and 1.69 au from Earth. Computed from JPL's orbital elements.

Facts

Number	5191
Provisional designation	1990 VO3
Orbit class	Main-belt Asteroid
Diameter	13.9 km (#3,434 largest of 17,440 named asteroids with a measured size)
Albedo	0.134
Rotation period	5.87 hours
Absolute magnitude (H)	12.32
Orbital period	5.23 years
Semi-major axis	3.01 au
Perihelion – aphelion	2.69 – 3.34 au
Eccentricity	0.108
Inclination	9.02°
Closest distance between its orbit and Earth's (MOID)	1.69 au

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

Also named after someone called Stephen

All asteroids named after someone called Stephen

Also discovered on 13 November 1990

More named asteroids discovered by Ueda, S., Kaneda, H.

All 96

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