2204 Lyyli
| Discovery [1] | |
|---|---|
| Discovered by | Y. Väisälä |
| Discovery site | Turku Observatory |
| Discovery date | 3 March 1943 |
| Designations | |
| MPC designation | 2204 Lyyli |
|
Named after
|
Lyyli Heinänen (Esperantist)[2] |
| 1943 EQ · 1968 DN | |
| Mars crosser [1][3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 72.46 yr (26,465 days) |
| Aphelion | 3.6433 AU |
| Perihelion | 1.5337 AU |
| 2.5885 AU | |
| Eccentricity | 0.4074 |
| 4.16 yr (1,521 days) | |
| 160.95° | |
| Inclination | 20.561° |
| 160.45° | |
| 283.28° | |
| Earth MOID | 0.6852 AU |
| Physical characteristics | |
| Dimensions | 25.16 km[4] 27.12±1.31 km[5] 25.27 km (derived)[3] |
| 11.063 h[6] 10 h[7] 9.51±0.01 h[8] 11.09±0.01 h[lower-alpha 1] |
|
| 0.0232[4] 0.020±0.002[5] 0.050±0.006[9] 0.0537 (derived)[3] |
|
| SMASS = X X [3] |
|
| 12.1 | |
2204 Lyyli, provisional designation 1943 EQ, is a dark asteroid and very eccentric Mars-crosser from the inner regions of the asteroid belt, about 25 kilometers in diameter. It was discovered on 3 March 1943 by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland.[10]
The X-type asteroid orbits the Sun at a distance of 1.5–3.6 AU once every 4 years and 2 months (1,521 days). Its orbit shows an outstanding eccentricity of 0.41, which is also notably tilted by 21 degrees to the plane of the ecliptic. It has a rotation period of 11 hours[6] and a very low albedo between 0.02 and 0.05, according to the surveys carried out by IRAS, Akari, and WISE/NEOWISE.[4][5][9]
Other large Mars crossing minor planets include 132 Aethra and 323 Brucia, with diameters of 43 and 36 kilometers, respectively.
The asteroid 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.[2]
References
- ↑ Warner (2015) web: rotation period 11.09±0.01 hours with a brightness amplitude of 0.39 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (2204) Lyyli
- ↑ 1.0 1.1 1.2 Lua error in package.lua at line 80: module 'strict' not found.
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- ↑ 3.0 3.1 3.2 3.3 Lua error in package.lua at line 80: module 'strict' not found.
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External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 2204 Lyyli at the JPL Small-Body Database
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