1573 Väisälä
| Discovery [1] | |
|---|---|
| Discovered by | S. Arend |
| Discovery site | Uccle – Belgium |
| Discovery date | 27 October 1949 |
| Designations | |
| MPC designation | 1573 Vaisala |
Named after |
Yrjö Väisälä (astronomer)[2] |
| 1949 UA | |
| main-belt · Phocaea [3] | |
| Orbital characteristics [1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 66.47 yr (24277 days) |
| Aphelion | 2.9190 AU (436.68 Gm) |
| Perihelion | 1.8235 AU (272.79 Gm) |
| 2.3713 AU (354.74 Gm) | |
| Eccentricity | 0.23099 |
| 3.65 yr (1333.7 d) | |
| 117.47° | |
| 0° 16m 11.712s / day | |
| Inclination | 24.542° |
| 202.39° | |
| 173.62° | |
| Earth MOID | 0.825936 AU (123.5583 Gm) |
| Jupiter MOID | 2.54202 AU (380.281 Gm) |
| Jupiter Tisserand parameter | 3.389 |
| Physical characteristics | |
| Dimensions |
9.77 km[3] 9.083±0.055 km[4] |
Mean radius | 4.885 ± 0.4 km |
| 252. h,[lower-alpha 1] 252 h (10.5 d)[1] | |
|
0.2226 (SIMPS)[3] 0.2818±0.0319[4] 0.2226 ± 0.043[1] | |
| S [3] | |
| 12.30 | |
|
| |
1573 Väisälä, provisional designation 1949 UA, is a stony asteroid, slow rotator and suspected tumbler from the inner regions of the asteroid belt, about 10 kilometers in diameter. It was discovered by Belgian astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle, on 27 October 1949.[5]
The S-type asteroid is a member of the Phocaea family. It orbits the Sun at a distance of 1.8–2.9 AU once every 3 years and 8 months (1,333 days). Its orbit shows an eccentricity of 0.23 and is tilted by 25 degrees to the plane of the ecliptic. The asteroid has a notably long rotation period of 252 hours and seems to be in a non-principal axis rotation (NPAR), colloquially called as "tumbling".[lower-alpha 1] The results, however, are provisional, as no follow-up observations have been made. The body's albedo amounts to 0.22 and 0.28, according to the Supplemental IRAS Minor Planet Survey (SIMPS) and the Wide-field Infrared Survey Explorer (WISE), respectively.[3][4]
The minor planet was named after prolific Finnish astronomer, Yrjö Väisälä (1891–1971), who discovered 128 asteroids, mostly in the late 1930s and early 1940s.[2] In addition, a second minor planet, 2804 Yrjö, was named in his honor by pioneering Finnish female astronomer Liisi Oterma, and the lunar crater Väisälä also bears his name.
References
- 1 2 Pravec (2012) web: rotation period 252 hours with a brightness amplitude of 0.76 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (1573) Vaisala
- 1 2 3 4 "JPL Small-Body Database Browser: 1573 Vaisala (1949 UA)" (2015-10-13 last obs.). Jet Propulsion Laboratory. Retrieved 26 April 2016.
- 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1573) Väisälä. Springer Berlin Heidelberg. p. 125. ISBN 978-3-540-29925-7. Retrieved November 2015.
- 1 2 3 4 5 "LCDB Data for (1573) Vaisala". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
- 1 2 3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; 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 November 2015.
- ↑ "1573 Vaisala (1949 UA)". Minor Planet Center. Retrieved November 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
- 1573 Väisälä at the JPL Small-Body Database
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