1446 Sillanpää
| Discovery [1] | |
|---|---|
| Discovered by | Y. Väisälä |
| Discovery site | Turku Observatory |
| Discovery date | 26 January 1938 |
| Designations | |
| MPC designation | 1446 Sillanpaa |
|
Named after
|
Frans Sillanpää (writer)[2] |
| 1938 BA · 1935 GB 1952 HQ3 · 1955 DQ 1965 EA |
|
| main-belt · Flora [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 77.17 yr (28,186 days) |
| Aphelion | 2.4744 AU |
| Perihelion | 2.0172 AU |
| 2.2458 AU | |
| Eccentricity | 0.1017 |
| 3.37 yr (1,229 days) | |
| 282.37° | |
| Inclination | 5.2562° |
| 17.558° | |
| 196.26° | |
| Physical characteristics | |
| Dimensions | 8.763±0.063 km[4] 7.35±0.29 km[5] 8.19 km (calculated)[3] |
| 9.6602 h[lower-alpha 1] 9.659±0.001 h[6] 9.65855±0.00005 h[7] 9.6597±0.0172 h[8] |
|
| 0.2109±0.0108[4] 0.327±0.080[5] 0.24 (assumed)[3] |
|
| S [3] | |
| 12.6 | |
1446 Sillanpää, provisional designation 1938 BA, is a stony asteroid from the inner regions of the asteroid belt, about 8 kilometers in diameter. It was discovered by Finnish astronomer Yrjö Väisälä at Turku Observatory on 26 January 1938.[9]
The asteroid is a member of the Flora family, a large group of S-type asteroids dwelling in the inner main-belt. It orbits the Sun at a distance of 2.0–2.5 AU once every 3 years 4 months (1,229 days). Its orbit shows an eccentricity of 0.10 and is tilted by 5 degrees to the plane of the ecliptic. It has a rotation period of 9.66 hours[lower-alpha 1][7][8] and an albedo of about 0.25, based on observations by the WISE and subsequent NEOWISE surveys.[4][5]
The minor planet was named after one of the most famous Finnish writers, Frans Eemil Sillanpää (1888–1964), first Finnish writer to receive the Nobel Prize in Literature in 1939 (also see List of Laureates since 1901).[2]
References
- ↑ 1.0 1.1 Pravec (2009) web: rotation period 9.6602±0.0008 hours with a brightness amplitude of 0.55 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (1446) Sillanpaa
- ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 4.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 5.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 7.0 7.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 8.0 8.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 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 (1)-(5000) – Minor Planet Center
- 1446 Sillanpää at the JPL Small-Body Database
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