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2204 Lyyli

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Dark asteroid

2204 Lyyli
Shape model of Lyyli from its lightcurve
Discovery 
Discovered byY. Väisälä
Discovery siteTurku Obs.
Discovery date3 March 1943
Designations
MPC designation(2204) Lyyli
Named afterLyyli Heinänen (Esperantist)
Alternative designations1943 EQ · 1968 DN
Minor planet categoryMars-crosser 
Orbital characteristics 
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc73.75 yr (26,937 days)
Aphelion3.6435 AU
Perihelion1.5354 AU
Semi-major axis2.5894 AU
Eccentricity0.4071
Orbital period (sidereal)4.17 yr (1,522 days)
Mean anomaly350.25°
Inclination20.561°
Longitude of ascending node160.45°
Argument of perihelion283.25°
Earth MOID0.6872 AU
Mars MOID0.2547 AU
Physical characteristics
Mean diameter25.16±2.4 km (IRAS:11)
25.27 km (derived)
27.12±1.31 km
Synodic rotation period9.51±0.01 h
10 h
11.063±0.001 h
11.09±0.01 h
Geometric albedo0.020±0.002
0.0232±0.005 (IRAS:11)
0.050±0.006
0.0537 (derived)
Spectral typeSMASS = X  · P  · X 
Absolute magnitude (H)11.61±0.44 · 11.78 · 12.1 · 12.70

2204 Lyyli (prov. designation: 1943 EQ) is a dark asteroid and very eccentric Mars-crosser from the middle region of the asteroid belt, approximately 25 kilometers (16 miles) in diameter. It was discovered on 3 March 1943 by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland.

Orbit and classification

Lyyli orbits the Sun in the central main-belt at a distance of 1.5–3.6 AU once every 4 years and 2 months (1,522 days). Its orbit has an eccentricity of 0.41 and an inclination of 21° with respect to the ecliptic.

Naming

This minor planet was named in honour of Lyyli Heinänen (1903–1988), née Hartonen, a Finnish female Esperantist, professor of mathematics, amateur astronomer and former assistant of the discoverer. The official naming citation was published by the Minor Planet Center on 26 May 1983 (M.P.C. 7944).

Physical characteristics

Lyyli is an X-type asteroid in the SMASS classification. It has also been characterized as a P-type asteroid by NASA's NEOWISE mission.

It has a rotation period of 11 hours and a very low albedo between 0.02 and 0.05, according to the surveys carried out by IRAS, Akari, and WISE/NEOWISE. Other large Mars crossing minor planets include 132 Aethra and 323 Brucia, with diameters of 43 and 36 kilometers, respectively.

References

  1. ^ "JPL Small-Body Database Browser: 2204 Lyyli (1943 EQ)" (2016-12-01 last obs.). Jet Propulsion Laboratory. Retrieved 12 June 2017.
  2. ^ Schmadel, Lutz D. (2007). "(2204) Lyyli". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 179. doi:10.1007/978-3-540-29925-7_2205. ISBN 978-3-540-00238-3.
  3. ^ "2204 Lyyli (1943 EQ)". Minor Planet Center. Retrieved 7 December 2016.
  4. ^ Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
  5. ^ "LCDB Data for (2204) Lyyli". Asteroid Lightcurve Database (LCDB). Retrieved 7 December 2016.
  6. ^ Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
  7. Gil-Hutton, R.; Cañ; ada, M. (April 2003). "Photometry of Fourteen Main Belt Asteroids". Revista Mexicana de Astronomía y Astrofísica. 39: 69–76. Bibcode:2003RMxAA..39...69G. Retrieved 7 December 2016.
  8. Mohamed, R. A.; Krugly, Yu. N.; Velichko, F. P. (April 1994). "Photometry of two Mars-crossing asteroids 2078 Nanking and 2204 Lyyli". Planetary and Space Science. 42 (4): 341–343. Bibcode:1994P&SS...42..341M. doi:10.1016/0032-0633(94)90107-4. Retrieved 7 December 2016.
  9. ^ Warner, Brian D. (October 2010). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2010 March - June" (PDF). Minor Planet Bulletin. 37 (4): 161–165. Bibcode:2010MPBu...37..161W. ISSN 1052-8091. Retrieved 18 March 2020.
  10. Warner, Brian D. (January 2016). "Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2015 June-September" (PDF). Minor Planet Bulletin. 43 (1): 57–65. Bibcode:2016MPBu...43...57W. ISSN 1052-8091. Archived from the original (PDF) on 3 October 2020. Retrieved 18 March 2020.
  11. ^ Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 2 May 2016.
  12. 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 7 December 2016.
  13. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 7 December 2016.

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