(10333) Portnoff Main-belt Asteroid

Discovered on 12 July 1991 by H. Debehogne at La Silla.

Morrie Portnoff (b. 1957) was President (2014–2020) of the RASC Montreal Centre. He led the revitalization of the Centre's activities and resources with the renewal of its partnership with John Abbott College. This included a relocation of the club library, the refitting of the Bellevue Observatory, and the RASC Montreal Centre Centennial celebrations in 2018.Naming citation (WGSBN Bull. 2, #15, 7), IAU / Minor Planet Center, via NASA/JPL

Where Portnoff is today

Seen from above the solar system on 2026-10-14: Portnoff is 2.52 au from the Sun and 1.60 au from Earth. Computed from JPL's orbital elements.

Facts

Number	10333
Provisional designation	1991 NZ6
Orbit class	Main-belt Asteroid
Diameter	8.46 km (#6,173 largest of 17,440 named asteroids with a measured size)
Albedo	0.156
Absolute magnitude (H)	13.38
Orbital period	4.92 years
Semi-major axis	2.89 au
Perihelion – aphelion	2.45 – 3.34 au
Eccentricity	0.153
Inclination	4.40°
Closest distance between its orbit and Earth's (MOID)	1.46 au

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

Also discovered on 12 July 1991

More named asteroids discovered by H. Debehogne

All 203

← (10332) Defi · (10334) Gibbon →