Discovery[1] | |
---|---|
Discovered by | Y. Väisälä |
Discovery site | Turku Obs. |
Discovery date | 11 March 1942 |
Designations | |
(1656) Suomi | |
Named after | Finland (country)[2] |
1942 EC · 1955 HL | |
Mars-crosser[1] · Hungaria[3] binary | |
Orbital characteristics[1] | |
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)[4][5][6] |
Earth MOID | 0.7551 AU |
Physical characteristics | |
7.86±0.7 km (IRAS:3)[7] 7.9 km[8] | |
2.42±0.02 h[8] 2.583±0.004 h[9] 2.5879±0.0002 h[10] 2.5879±0.0003 h[11] 2.59±0.01 h[12][13][14] 62.16 h (wrong)[15] | |
0.1556±0.032 (IRAS:3)[7] 0.157[8] | |
Tholen = S[1] · S[16][5] | |
12.9[1][17] · 12.97±0.31[18] · 13.13±0.11[8] · 13.146±0.1[5][19] · 13.16[7] | |
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,[3] who named it "Suomi", the native name of Finland.[2] 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.[6] 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.[4][5]
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