1656 Suomi
| Discovery | |
|---|---|
| Discovered by | Y. Väisälä |
| Discovery site | Turku Obs. |
| Discovery date | 11 March 1942 |
| Designations | |
| (1656) Suomi | |
Named after | Finland (country) |
| 1942 EC · 1955 HL | |
| Mars-crosser · Hungaria binary | |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 75.24 years (27,480 days) |
| Aphelion | 2.1093 AU |
| Perihelion | 1.6456 AU |
| 1.8774 AU | |
| Eccentricity | 0.1235 |
| 2.57 yr (940 days) | |
| 174.69° | |
| 0° 22m 59.16s / day | |
| Inclination | 25.067° |
| 175.57° | |
| 287.44° | |
| Known satellites | 1 1.98+ km (> 0.26Ds/Dp; P: 57.92 h) |
| Earth MOID | 0.7551 AU |
| Physical characteristics | |
| 7.86±0.7 km (IRAS:3) 7.9 km | |
| 2.42±0.02 h 2.583±0.004 h 2.5879±0.0002 h 2.5879±0.0003 h 2.59±0.01 h 62.16 h (wrong) | |
| 0.1556±0.032 (IRAS:3) 0.157 | |
| Tholen = S · S | |
| 12.9 · 12.97±0.31 · 13.13±0.11 · 13.146±0.1 · 13.16 | |
1656 Suomi (prov. designation: 1942 EC) is a binary Hungaria asteroid and sizable Mars-crosser from the innermost regions of the asteroid belt. It was discovered on 11 March 1942, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland, who named it "Suomi", the native name of Finland. The stony asteroid has a short rotation period of 2.6 hours and measures approximately 7.9 kilometers in diameter. In June 2020, a companion was discovered by Brian Warner, Robert Stephens and Alan Harris. The satellite measures more than 1.98 kilometers in diameter, about 26% of the primary, which it orbits once every 57.9 hours at an average distance of 30 kilometers.