1656 Suomi
| Discovery [1] | |
|---|---|
| Discovered by | Y. Väisälä |
| Discovery site | Turku Observatory |
| Discovery date | 11 March 1942 |
| Designations | |
| MPC designation | 1656 Suomi |
|
Named after
|
Finland (country)[2] |
| 1942 EC · 1955 HL | |
| Mars-crosser · Hungaria [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 73.61 yr (26,886 days) |
| Aphelion | 2.1090 AU |
| Perihelion | 1.6463 AU |
| 1.8777 AU | |
| Eccentricity | 0.1232 |
| 2.57 yr (940 days) | |
| 228.24° | |
| Inclination | 25.068° |
| 175.57° | |
| 287.43° | |
| Earth MOID | 0.7546 AU |
| Physical characteristics | |
| Dimensions | 7.86 km[4] 7.9 km[5] |
| 2.583 h[6] 2.42±0.02 h[5] 2.59±0.01 h[7] 2.59±0.01 h[8] 62.16 h[9] 2.5879±0.0002 h[10] 2.59±0.01 h[11] 2.5879±0.0003 h[lower-alpha 1] |
|
| 0.1556[4] 0.157[5] |
|
| Tholen = S S [3] |
|
| 12.9 | |
1656 Suomi, provisional designation 1942 EC, is a stony asteroid in the asteroid belt classified as a Mars-crosser, about 8 kilometers in diameter. It was discovered by Finnish astronomer Yrjö Väisälä at Turku Observatory on March 11, 1942.[12]
The S-type asteroid orbits the Sun at a distance of 1.6–2.1 AU once every 2.57 years (940 days). Its orbit shows an eccentricity of 0.12 and is tilted by 25 degrees to the plane of the ecliptic. It has a rotation period of 2.583 hours and an albedo of 0.156.
Measurements by IRAS show that the asteroid is 8 kilometers in diameter, making it the 9th largest Mars crossing asteroid with a known diameter.[13] This asteroid is a Hungaria family object with a rotational period of 2.583 hours based on 2009 observations.[14] Earlier observations published in 2004 and 2008 had estimated rotational period of 2.59 hours, while observations published in 1997 had originally estimated a rotational period of 2.42 hours.[15][16]
As with 1453 Fennia, it is named after Finland, Suomi being the Finnish word for Finland.[2][17]
References
- ↑ Warner(2015) web: rotation period of 2.5879±0.0003, summary figures at Asteroid Lightcurve Database for (1656) Suomi
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- ↑ Warner, Brian D. ASTEROID LIGHTCURVE ANALYSIS AT THE PALMER DIVIDE OBSERVATORY: 2008 DECEMBER – 2009 MARCH, Minor Planet Bulletin, Vol. 36, No.3 (2009)
- ↑ Stephens, Robert D. Photometry of 1196 Sheba, 1341 Edmee, 1656 Suomi, 2577 Litva, and 2612 Kathryn, Minor Planet Bulletin, Vol. 31, No. 4, p. 95 - 97 (2004)
- ↑ Wisniewski, W. Z., et al. Photometric Observations of 125 Asteroids, Icarus, Volume 126, Issue 2, pp. 395-449.
- ↑ Turun Ursa, Retrieved 27 May 2015 (in Finnish)
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1656 Suomi at the JPL Small-Body Database
