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2204 Lyyli

Dark asteroid

Field	Value
minorplanet	yes
name	2204 Lyyli
background	#FA8072
image	002204-asteroid shape model (2204) Lyyli.png
caption	Shape model of Lyyli from its lightcurve
discovery_ref
discovered	3 March 1943
discoverer	Y. Väisälä
discovery_site	Turku Obs.
mpc_name	(2204) Lyyli
alt_names	1943 EQ1968 DN
named_after	Lyyli Heinänen (Esperantist)
mp_category	Mars-crosser
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	73.75 yr (26,937 days)
aphelion	3.6435 AU
perihelion	1.5354 AU
semimajor	2.5894 AU
eccentricity	0.4071
period	4.17 yr (1,522 days)
mean_anomaly	350.25°
inclination	20.561°
asc_node	160.45°
arg_peri	283.25°
moid	0.6872 AU
mars_moid	0.2547 AU
mean_diameter	(IRAS:11)
25.27 km (derived)
km
rotation
h
h
albedo
(IRAS:11)
0.0537 (derived)
spectral_type	SMASS = XPX
abs_magnitude	11.7812.112.70

25.27 km (derived) km

h h (IRAS:11)

0.0537 (derived)

2204 Lyyli (prov. designation: ) is a dark asteroid and very eccentric Mars-crosser from the middle region of the asteroid belt, approximately 25 km 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

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

mars-crossing-asteroids discoveries-by-yrjö-väisälä named-minor-planets astronomical-objects-discovered-in-1943

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