(4139) Ul'yanin Main-belt Asteroid

Discovered on 2 November 1975 by T. M. Smirnova at Nauchnyj.

Named in memory of Sergej Alekseevich Ulʹyanin (1871–1921), Russian pilot and talented inventor, who graduated from the Farman pilot school in France in 1910. Two of his projects involved the design of new airplanes, one of which was realized. He also designed a radio navigation system for airplanes in flight, as well as apparatus for air photography.Naming citation (WGSBN Bull. 6, #10, 5), IAU / Minor Planet Center, via NASA/JPL

Where Ul'yanin is today

Seen from above the solar system on 2026-10-14: Ul'yanin is 3.35 au from the Sun and 2.93 au from Earth. Computed from JPL's orbital elements.

Facts

Number	4139
Provisional designation	1975 VE2
Orbit class	Main-belt Asteroid
Diameter	12.7 km (#3,821 largest of 17,440 named asteroids with a measured size)
Albedo	0.158
Absolute magnitude (H)	12.35
Orbital period	5.58 years
Semi-major axis	3.15 au
Perihelion – aphelion	2.63 – 3.66 au
Eccentricity	0.164
Inclination	1.59°
Closest distance between its orbit and Earth's (MOID)	1.62 au

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

Also named after someone called Sergej

All asteroids named after someone called Sergej

Also discovered on 2 November 1975

More named asteroids discovered by T. M. Smirnova

All 134

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