1656 Suomi

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]
binary
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc75.24 years (27,480 days)
Aphelion2.1093 AU
Perihelion1.6456 AU
1.8774 AU
Eccentricity0.1235
2.57 yr (940 days)
174.69°
0° 22m 59.16s / day
Inclination25.067°
175.57°
287.44°
Known satellites1 1.98+ km (> 0.26Ds/Dp; P: 57.92 h)[4][5][6]
Earth MOID0.7551 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]

  1. ^ a b c d e Cite error: The named reference jpldata was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference springer was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference MPC-Suomi was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference johnstonsarchive was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference lcdb was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Warner-2020 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference SIMPS was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Wisniewski-1997 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Warner-2009k was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Warner-2012s was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Warner-2016b was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Stephens-2004f was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Brinsfield-2008a was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Warner-2014j was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference geneva-obs was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Sanchez-2013 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Faure-2007 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference Veres-2015 was invoked but never defined (see the help page).
  19. ^ Cite error: The named reference Pravec-2012b was invoked but never defined (see the help page).