(428) Monachia Main-belt Asteroid

Discovered on 18 November 1897 by W. Villiger at Munich.

Where Monachia is today

Seen from above the solar system on 2026-10-14: Monachia is 2.20 au from the Sun and 2.12 au from Earth. Computed from JPL's orbital elements.

Facts

Number	428
Provisional designation	A897 WA
Orbit class	Main-belt Asteroid
Diameter	20.2 km (#2,182 largest of 17,440 named asteroids with a measured size)
Albedo	0.0690
Rotation period	3.63 hours
Absolute magnitude (H)	11.99
Orbital period	3.51 years
Semi-major axis	2.31 au
Perihelion – aphelion	1.90 – 2.72 au
Eccentricity	0.178
Inclination	6.19°
Closest distance between its orbit and Earth's (MOID)	0.903 au

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

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