(8190) Bouguer Main-belt Asteroid

Discovered on 20 July 1993 by E. W. Elst at La Silla.

Named in memory of the French scientist Pierre Bouguer (1698-1758), the founder of astronomical photometry. In 1720 he made some of the earliest measurements in astronomical photometry by comparing the apparent brightness of celestial objects to the light of a candle. In 1735 he followed de la Condamine to measure an arc of the meridian near the equator in Peru. During his stay he investigated the absorption of light in the atmosphere, which led to the formulation of “Bouguer's absorption law”.Naming citation (19990402/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL

Where Bouguer is today

Seen from above the solar system on 2026-10-14: Bouguer is 2.32 au from the Sun and 1.79 au from Earth. Computed from JPL's orbital elements.

Facts

Number	8190
Provisional designation	1993 ON9
Orbit class	Main-belt Asteroid
Diameter	3.57 km (#13,777 largest of 17,440 named asteroids with a measured size)
Albedo	0.318
Rotation period	6.85 hours
Absolute magnitude (H)	14.47
Orbital period	3.28 years
Semi-major axis	2.21 au
Perihelion – aphelion	1.94 – 2.48 au
Eccentricity	0.122
Inclination	3.04°
Closest distance between its orbit and Earth's (MOID)	0.955 au

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

Also named after someone called Pierre

All asteroids named after someone called Pierre

Also discovered on 20 July 1993

More named asteroids discovered by E. W. Elst

All 1035

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