1473 Ounas

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. 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.
    2. 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 18 November 2015.
    3. 1 2 3 4 "LCDB Data for (1473) Ounas". Asteroid Lightcurve Database (LCDB). Retrieved 18 November 2015.
    4. 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 18 November 2015.
    5. 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 18 November 2015.
    6. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1473) Ounas". Geneva Observatory. Retrieved 18 November 2015.
    7. ↑ "1473 Ounas (1938 UT)". Minor Planet Center. Retrieved 18 November 2015.

    External links


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