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1656 Suomi

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1656 Suomi, provisional designation 1942 EC, is a stony Hungaria asteroid and Mars-crosser from the innermost regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 11 March 1942, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland.[3]

1656 Suomi
Discovery [1]
Discovered byY. Väisälä
Discovery siteTurku Obs.
Discovery date11 March 1942
Designations
1656 Suomi
Named after
Finland (country)[2]
1942 EC · 1955 HL
Mars-crosser [1] · Hungaria [3]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc73.90 yr (26993 days)
Aphelion2.1089 AU (315.49 Gm)
Perihelion1.6463 AU (246.28 Gm)
1.8776 AU (280.88 Gm)
Eccentricity0.12319
2.57 yr (939.72 d)
304.83°
0° 22m 58.8s / day
Inclination25.069°
175.57°
287.46°
Earth MOID0.7539 AU
Physical characteristics
Dimensions7.86±0.7 km (IRAS:3)[4]
7.9 km[5]
2.42±0.02 h[5]
2.59±0.01 h[6][7][8]
62.16 h[9]
2.583±0.004 h[10]
2.5879±0.0002 h[11]
2.5879±0.0003 h[12]
0.1556±0.032 (IRAS:3)[4]
0.157[5]
Tholen = S [1] · S [13][14]
12.9[1][15]
12.97±0.31[16]
13.13±0.11[5]
13.146±0.1[14][17]
13.16[4]

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.[18] This asteroid is a Hungaria family object with a rotational period of 2.583 hours based on 2009 observations. 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.

As with 1453 Fennia, it is named after Finland, Suomi being the Finnish word for Finland.[2] Naming citation was published before November 1977 (M.P.C. 3932).[19]

References

  1. ^ a b c d e "JPL Small-Body Database Browser: 1656 Suomi (1942 EC)" (2016-02-03 last obs.). Jet Propulsion Laboratory. Retrieved 24 December 2016.
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1656) Suomi. Springer Berlin Heidelberg. p. 132. ISBN 978-3-540-00238-3. Retrieved 24 December 2016.
  3. ^ a b "1656 Suomi (1942 EC)". Minor Planet Center. Retrieved 24 December 2016.
  4. ^ a b c 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 24 December 2016.
  5. ^ a b c d 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 24 December 2016.
  6. ^ 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 24 December 2016.
  7. ^ 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 24 December 2016.
  8. ^ 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 24 December 2016.
  9. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (1656) Suomi". Geneva Observatory. Retrieved 24 December 2016.
  10. ^ 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 24 December 2016.
  11. ^ 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 24 December 2016.
  12. ^ Warner, Brian D. (January 2016). "Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2015 June-September". The Minor Planet Bulletin. 43 (1): 57–65. Bibcode:2016MPBu...43...57W. ISSN 1052-8091. Retrieved 24 December 2016.
  13. ^ Sanchez, Juan A.; Michelsen, René; Reddy, Vishnu; Nathues, Andreas (July 2013). "Surface composition and taxonomic classification of a group of near-Earth and Mars-crossing asteroids". Icarus. 225 (1): 131–140. arXiv:1302.4449. Bibcode:2013Icar..225..131S. doi:10.1016/j.icarus.2013.02.036. Retrieved 24 December 2016.
  14. ^ a b "LCDB Data for (1656) Suomi". Asteroid Lightcurve Database (LCDB). Retrieved 24 December 2016.
  15. ^ Faure, Gerard; Garret, Lawrence (December 2007). "Suggested Revised H Values of Selected Asteroids: Report Number 3". The Minor Planet Bulletin. 34 (4): 95–99. Bibcode:2007MPBu...34...95F. ISSN 1052-8091. Retrieved 24 December 2016.
  16. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 24 December 2016.
  17. ^ Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved 24 December 2016.
  18. ^ "JPL Small-Body Database Search Engine: orbital class (MCA) and diameter > 0 (km)". JPL Solar System Dynamics. Retrieved 2015-05-26.
  19. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 December 2016.
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