(2820) Iisalmi Main-belt Asteroid

Discovered on 8 September 1942 by Y. Vaisala at Turku.

Named for a town, parts of which date back to the stone age, in the lake district of central Finland. Known for the spa Runni, monuments there memorialize important events in Finnish history. Iisalmi was also the home of famous writers, including Eero Salmelainen, who compiled the celebrated collection Suomen kansa satuja i tarinita (Finnish Folk Tales and Stories), published during 1852–1866.Naming citation (WGSBN Bull. 5, #9, 5), IAU / Minor Planet Center, via NASA/JPL

Where Iisalmi is today

Seen from above the solar system on 2026-10-14: Iisalmi is 2.18 au from the Sun and 2.38 au from Earth. Computed from JPL's orbital elements.

Facts

Number	2820
Provisional designation	1942 RU
Orbit class	Main-belt Asteroid
Diameter	6.83 km (#7,844 largest of 17,440 named asteroids with a measured size)
Albedo	0.264
Rotation period	2.76 hours
Absolute magnitude (H)	13.03
Orbital period	3.33 years
Semi-major axis	2.23 au
Perihelion – aphelion	1.87 – 2.59 au
Eccentricity	0.161
Inclination	2.95°
Closest distance between its orbit and Earth's (MOID)	0.870 au

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

Also discovered on 8 September 1942

More named asteroids discovered by Y. Vaisala

All 128

← (2819) Ensor · (2821) Slavka →