1656 Suomi

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 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 73.90 yr (26993 days)
Aphelion 2.1089 AU (315.49 Gm)
Perihelion 1.6463 AU (246.28 Gm)
1.8776 AU (280.88 Gm)
Eccentricity 0.12319
2.57 yr (939.72 d)
304.83°
0° 22m 59.124s / day
Inclination 25.069°
175.57°
287.46°
Earth MOID 0.754149 AU (112.8191 Gm)
Jupiter MOID 3.03598 AU (454.176 Gm)
Jupiter Tisserand parameter 3.851
Physical characteristics
Dimensions 7.86 km[4]
7.9 km[5]
Mean radius
 3.93 ± 0.35 km
2.583 h (0.1076 d)[1][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]
0.1556 ± 0.032[1]
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

    1. ↑ Warner(2015) web: rotation period of 2.5879±0.0003, summary figures at Asteroid Lightcurve Database for (1656) Suomi
    1. 1 2 3 4 "JPL Small-Body Database Browser: 1656 Suomi (1942 EC)" (2015-10-19 last obs.). Jet Propulsion Laboratory. Retrieved 22 April 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1656) Suomi. Springer Berlin Heidelberg. p. 132. ISBN 978-3-540-29925-7. Retrieved 12 November 2015.
    3. 1 2 "LCDB Data for (1656) Suomi". Asteroid Lightcurve Database (LCDB). Retrieved 12 November 2015.
    4. 1 2 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 12 November 2015.
    5. 1 2 3 Wisniewski, W. Z.; Michalowski, T. M.; Harris, A. W.; McMillan, R. S. (March 1995). "Photoelectric Observations of 125 Asteroids". Abstracts of the Lunar and Planetary Science Conference. Bibcode:1995LPI....26.1511W. Retrieved 12 November 2015.
    6. ↑ Warner, Brian D. (July 2009). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2008 December - 2009 March". The Minor Planet Bulletin. 36 (3): 109–116. Bibcode:2009MPBu...36..109W. ISSN 1052-8091. Retrieved 12 November 2015.
    7. ↑ Stephens, Robert D. (December 2004). "Photometry of 1196 Sheba, 1341 Edmee, 1656 Suomi, 2577 Litva, and 2612 Kathryn". The Minor Planet Bulletin. 31 (4): 95–97. Bibcode:2004MPBu...31...95S. ISSN 1052-8091. Retrieved 12 November 2015.
    8. ↑ Brinsfield, James W. (March 2008). "The Rotation Periods of 1465 Autonoma, 1656 Suomi 4483 Petofi, 4853 Marielukac, and (85275) 1994 LY". The Minor Planet Bulletin. 35 (1): 23–24. Bibcode:2008MPBu...35...23B. ISSN 1052-8091. Retrieved 12 November 2015.
    9. ↑ Behrend, Raoul. "Asteroids and comets rotation curves – (1656) Suomi". Geneva Observatory. Retrieved 12 November 2015.
    10. ↑ Warner, Brian D. (October 2012). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2012 March - June". The Minor Planet Bulletin. 39 (4): 245–252. Bibcode:2012MPBu...39..245W. ISSN 1052-8091. Retrieved 12 November 2015.
    11. ↑ Warner, Brian D. (July 2014). "Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 January-March". The Minor Planet Bulletin. 41 (3): 144–155. Bibcode:2014MPBu...41..144W. ISSN 1052-8091. Retrieved 12 November 2015.
    12. ↑ "1656 Suomi (1942 EC)". Minor Planet Center. Retrieved 12 November 2015.
    13. ↑ "JPL Small-Body Database Search Engine: orbital class (MCA) and diameter > 0 (km)". JPL Solar System Dynamics. Retrieved 2015-05-26.
    14. ↑ Warner, Brian D. ASTEROID LIGHTCURVE ANALYSIS AT THE PALMER DIVIDE OBSERVATORY: 2008 DECEMBER – 2009 MARCH, Minor Planet Bulletin, Vol. 36, No.3 (2009)
    15. ↑ 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)
    16. ↑ Wisniewski, W. Z., et al. Photometric Observations of 125 Asteroids, Icarus, Volume 126, Issue 2, pp. 395-449.
    17. ↑ Turun Ursa, Retrieved 27 May 2015 (in Finnish)

    External links

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