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 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 77.39 yr (28267 days) |
| Aphelion | 3.2400 AU (484.70 Gm) |
| Perihelion | 2.4606 AU (368.10 Gm) |
| 2.8503 AU (426.40 Gm) | |
| Eccentricity | 0.13673 |
| 4.81 yr (1757.6 d) | |
| 42.067° | |
| 0° 12m 17.352s / day | |
| Inclination | 15.064° |
| 12.591° | |
| 48.330° | |
| Earth MOID | 1.49533 AU (223.698 Gm) |
| Jupiter MOID | 2.29329 AU (343.071 Gm) |
| Jupiter Tisserand parameter | 3.242 |
| Physical characteristics | |
| Dimensions |
16.095±0.070 km[4] 16.29±0.20 km[5] 24.30 km (calculated)[3] |
| 4.32 h (0.180 d)[1][6] | |
|
0.1733±0.0300[4] 0.116±0.018[5] 0.057 (assumed)[3] | |
| C [3] | |
| 11.8[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 city of Seinäjoki, located in Southern Ostrobothnia, western Finland.[2]
References
- 1 2 3 4 "JPL Small-Body Database Browser: 1521 Seinajoki (1938 UB1)" (2015-11-18 last obs.). Jet Propulsion Laboratory. Retrieved 27 April 2016.
- 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 7 December 2015.
- 1 2 3 4 5 "LCDB Data for (1521) Seinajoki". Asteroid Lightcurve Database (LCDB). Retrieved 7 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 7 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 7 December 2015.
- 1 2 Durkee, Russell I. (January 2011). "Asteroids Observed from the Shed of Science Observatory: 2010 May-October". The Minor Planet Bulletin. 38 (1): 39–40. Bibcode:2011MPBu...38...39D. ISSN 1052-8091. Retrieved 7 December 2015.
- ↑ "1521 Seinajoki (1938 UB1)". Minor Planet Center. Retrieved 7 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
