(51) Nemausa Main-belt Asteroid

Discovered on 22 January 1858 by J. J. P. Laurent at Nimes.

Where Nemausa is today

Seen from above the solar system on 2026-10-14: Nemausa is 2.44 au from the Sun and 2.48 au from Earth. Computed from JPL's orbital elements.

Number	51
Provisional designation	A858 BA
Orbit class	Main-belt Asteroid
Diameter	138 km (#106 largest of 17,440 named asteroids with a measured size)
Albedo	0.100
Rotation period	7.78 hours
Spectral type	CU
Absolute magnitude (H)	7.72
Orbital period	3.64 years
Semi-major axis	2.37 au
Perihelion – aphelion	2.21 – 2.52 au
Eccentricity	0.0660
Inclination	9.97°
Closest distance between its orbit and Earth's (MOID)	1.21 au