1473 Ounas
| Discovery [1] | |
|---|---|
| Discovered by | Y. Väisälä |
| Discovery site | Turku Observatory |
| Discovery date | 22 October 1938 |
| Designations | |
| MPC designation | 1473 Ounas |
Named after |
Ounas river (in Finland)[2] |
|
1938 UT · 1950 NZ 1950 PB1 | |
| main-belt · (inner) [3] | |
| Orbital characteristics [1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 77.34 yr (28250 days) |
| Aphelion | 3.1857 AU (476.57 Gm) |
| Perihelion | 1.9623 AU (293.56 Gm) |
| 2.5740 AU (385.06 Gm) | |
| Eccentricity | 0.23764 |
| 4.13 yr (1508.4 d) | |
| 332.10° | |
| 0° 14m 19.176s / day | |
| Inclination | 13.650° |
| 216.52° | |
| 129.44° | |
| Earth MOID | 0.986496 AU (147.5777 Gm) |
| Jupiter MOID | 2.38671 AU (357.047 Gm) |
| Jupiter Tisserand parameter | 3.349 |
| Physical characteristics | |
| Dimensions |
17.58 km 20.032±0.079 km[4] 17.62 km (derived)[3] |
Mean radius | 8.79±0.35 km |
| 139.1 h (5.80 d)[1][5][6] | |
|
0.0841±0.0080[4] 0.1189 (derived)[3] 0.1089±0.009[1] | |
| S [3] | |
| 11.7 | |
|
| |
1473 Ounas, provisional designation 1938 UT, is a stony asteroid and slow rotator from the inner regions of the asteroid belt, about 18 kilometers in diameter. It was discovered by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland on 22 October 1938.[7]
The S-type asteroid orbits the Sun at a distance of 2.0–3.2 AU once every 4.13 years (1,508 days). Its orbit shows an eccentricity of 0.24 and is tilted by 14 degrees to the plane of the ecliptic. It has a very long rotation period of 139.100 hours[5][6] and an albedo of 0.11.[4]
The minor planet was named after the Ounas river, one of the principal rivers in Finland.[2]
References
- 1 2 3 4 "JPL Small-Body Database Browser: 1473 Ounas (1938 UT)" (2015-07-13 last obs.). Jet Propulsion Laboratory. Retrieved 27 April 2016.
- 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1473) Ounas. Springer Berlin Heidelberg. p. 118. ISBN 978-3-540-29925-7. Retrieved November 2015.
- 1 2 3 4 "LCDB Data for (1473) Ounas". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
- 1 2 3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; 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.
- 1 2 Pilcher, Frederick; Benishek, Vladimir; Ferrero, Andrea; Klinglesmith, Daniel A., III; Pravec, Petr; et al. (July 2013). "New Photometry of 1473 Ounas". The Minor Planet Bulletin 40 (3): 126–129. Bibcode:2013MPBu...40..126P. ISSN 1052-8091. Retrieved November 2015.
- 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1473) Ounas". Geneva Observatory. Retrieved November 2015.
- ↑ "1473 Ounas (1938 UT)". 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
- 1473 Ounas at the JPL Small-Body Database
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