15224 Penttilä
| Discovery [1] | |
|---|---|
| Discovered by | E. Bowell |
| Discovery site | Anderson Mesa Station |
| Discovery date | 15 May 1985 |
| Designations | |
| MPC designation | 15224 Penttila |
|
Named after
|
Antti Penttilä (astronomer)[2] |
| 1985 JG · 1970 HB 2000 HR19 |
|
| main-belt · (inner) [3] | |
| Orbital characteristics [1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 45.30 yr (16,545 days) |
| Aphelion | 3.0001 AU |
| Perihelion | 1.8330 AU |
| 2.4166 AU | |
| Eccentricity | 0.2414 |
| 3.76 yr (1,372 days) | |
| 41.185° | |
| Inclination | 12.346° |
| 70.121° | |
| 196.29° | |
| Physical characteristics | |
| Dimensions | 7.924±0.119 km[4] 8.79±3.79 km[5] 4.93 km (calculated)[3] |
| 4.377±0.001 h[6] 4.3771±0.0064 h[7] |
|
| 0.0849±0.0241[4] 0.069±0.175[5] 0.20 (assumed)[3] |
|
| S [3] | |
| 13.9[1][3] 13.8[4][5] 14.309±0.009 (S)[7] 13.988±0.006 (R)[7] |
|
15224 Penttila, provisional designation 1985 JG, is a stony asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered by American astronomer Edward Bowell at Lowell's U.S. Anderson Mesa Station, Arizona, on 15 May 1985.[2]
The S-type asteroid orbits the Sun at a distance of 1.8–3.0 AU once every 3 years and 9 months (1,372 days). Its orbit has an eccentricity of 0.24 and an inclination of 12° with respect to the ecliptic.[1] Due to precovery images taken at the Crimean Astrophysical Observatory in 1970, the asteroid's observation arc spans over a period of almost half a century.[2]
In 2015, a photometric light-curve analysis by astronomre Daniel Klinglesmith at Etscorn Campus Observatory, New Mexico, gave it a rotation period of 4.377±0.001 hours with a brightness amplitude of 0.55 in magnitude (U=3-).[6] A nearly identical period of 4.3771±0.0064 hours with a magnitude variation of 0.46 was previously obtained at the U.S. Palomar Transient Factory, California, in 2012 (U=2).[7]
According to the surveys carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 7.9 and 8.8 kilometers in diameter, with a low albedo of 0.085 and 0.069, respectively.[4][5] The Collaborative Asteroid Lightcurve Link (CALL), however, assumes a standard albedo for stony asteroids of 0.20, and hence calculates a smaller diameter of 4.9 kilometers.[3]
The minor planet was named for Finish postdoctoral researcher Antti Penttilä (b. 1977) at the University of Helsinki. He is a specialist on the scattering and absorption of light by cosmic dust in cometary comae as well as on the surfaces of asteroids and cometary nuclei.[2]
References
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- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 4.2 4.3 Lua error in package.lua at line 80: module 'strict' not found.
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- ↑ 7.0 7.1 7.2 7.3 Lua error in package.lua at line 80: module 'strict' not found.
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 (15001)-(20000) – Minor Planet Center
- 15224 Penttilä at the JPL Small-Body Database
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