1521 Seinäjoki
| Discovery [1] | |
|---|---|
| Discovered by | Y. Väisälä |
| Discovery site | Turku Observatory |
| Discovery date | 22 October 1938 |
| Designations | |
| MPC designation | 1521 Seinajoki |
Named after |
Seinäjoki (Finnish town)[2] |
|
1938 UB1 · 1933 UR1 1967 UW | |
| main-belt · (outer) [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 77.07 yr (28,151 days) |
| Aphelion | 3.2414 AU |
| Perihelion | 2.4604 AU |
| 2.8509 AU | |
| Eccentricity | 0.1369 |
| 4.81 yr (1,758 days) | |
| 320.18° | |
| Inclination | 15.063° |
| 12.590° | |
| 48.282° | |
| Physical characteristics | |
| Dimensions |
16.095±0.070 km[4] 16.29±0.20 km[5] 24.30 km (caculated)[3] |
| 4.32 h[6] | |
|
0.1733±0.0300[4] 0.116±0.018[5] 0.057 (assumed)[3] | |
| C [3] | |
| 11.9[1] | |
|
| |
1521 Seinäjoki, provisional designation 1938 UB1, is an asteroid from the outer region of the asteroid belt, about 16 kilometers in diameter. It was discovered by Finnish astronomer Yrjö Väisälä at the southwestern Turku Observatory, Finland, on 22 October 1938.[7]
The asteroid orbits the Sun at a distance of 2.5–3.2 AU once every 4 years and 10 months (1,758 days). Its orbit shows an eccentricity of 0.14 and is tilted by 15 degrees to the plane of the ecliptic. It has a rotation period of 4.3 hours[6] and an albedo of 0.12 and 0.17, based on preliminary results of the Wide-field Infrared Survey Explorer's NEOWISE mission.[4][5] However, the Collaborative Asteroid Lightcurve Link (CALL) assumes the body to have a much lower albedo of 0.06, which is typical for a carbonaceous C-type asteroid. As a result, CALL calculates a larger diameter of 24 kilometers, since, for a given absolute magnitude, a body's calculated diameter increases when its albedo decreases.[3]
The minor planet was named for the town Seinäjoki, located in Southern Ostrobothnia, western Finland.[2]
References
- 1 2 3 "JPL Small-Body Database Browser: 1521 Seinajoki (1938 UB1)" (2015-11-18 last obs.). Jet Propulsion Laboratory. Retrieved December 2015.
- 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1521) Seinäjoki. Springer Berlin Heidelberg. p. 121. ISBN 978-3-540-29925-7. Retrieved December 2015.
- 1 2 3 4 5 "LCDB Data for (1521) Seinajoki". Asteroid Lightcurve Database (LCDB). Retrieved December 2015.
- 1 2 3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; McMillan, R. S.; 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 December 2015.
- 1 2 3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; Cabrera, M. S. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved December 2015.
- 1 2 Durkee, Russell I. (January 2011). "Asteroids Observed from the Shed of Science Observatory: 2010 May-October". Bulletin of the Minor Planets (Section of the Association of Lunar and Planetary Observers) 38 (1): 39–40. Bibcode:2011MPBu...38...39D. ISSN 1052-8091. Retrieved December 2015.
- ↑ "1521 Seinajoki (1938 UB1)". Minor Planet Center. Retrieved December 2015.
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
- 1521 Seinäjoki at the JPL Small-Body Database
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