1512 Oulu

1512 Oulu
Discovery [1]
Discovered by H. Alikoski
Discovery site Turku Observatory
Discovery date 18 March 1939
Designations
MPC designation 1512 Oulu
Named after
 Oulu (Finnish town)[2]
1939 FE · 1938 CU
1957 TA · 1958 XS
main-belt (outer) · Hilda [3]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 77.02 yr (28131 days)
Aphelion 4.5485 AU (680.45 Gm)
Perihelion 3.3783 AU (505.39 Gm)
3.9634 AU (592.92 Gm)
Eccentricity 0.14762
7.89 yr (2882.0 d)
282.92°
0° 7m 29.676s / day
Inclination 6.4916°
10.175°
239.49°
Earth MOID 2.37115 AU (354.719 Gm)
Jupiter MOID 0.640192 AU (95.7714 Gm)
Jupiter Tisserand parameter 3.028
Physical characteristics
Dimensions 82.72±2.5 km (IRAS:38)[4]
65.0 km[5]
91.05±2.20 km[6]
65.000±4.137 km[7]
Mean radius
 41.36±1.25 km
132.3 h (5.51 d)[1][8]
0.0366±0.002 (IRAS:38)[1][4]
0.0594[5]
0.06±0.03[9]
0.031±0.001[6]
0.0536±0.0061[7]
B–V = 0.715
U–B = 0.190
Tholen = P
P [3]
9.62[1]

    1512 Oulu, provisional designation 1939 FE, is a rare-type Hildian asteroid and slow rotator from the outermost region of the asteroid belt. With a diameter of about 80 kilometers, it belongs to the fifty largest asteroids in the outer main-belt. The body was discovered on 18 March 1939, by Finnish astronomer Heikki Alikoski at Turku Observatory in Southwest Finland.[10]

    The dark and reddish asteroid classifies as a P-type asteroid in the Tholen taxonomy, of which only a few dozens bodies are currently known.[11] It orbits the Sun at a distance of 3.4–4.5 AU once every 7 years and 10 months (2,871 days). Its orbit shows an eccentricity of 0.15 and is tilted by 6 degrees to the plane of the ecliptic. It is a slow rotator with a long rotation period of 132.3 hours.[8] Its low albedo lies in the range of 0.03 to 0.06, according to the surveys carried out by IRAS, Akari, and WISE/NEOWISE, as well as one observation using stellar occultation to determine its albedo (occultation albedo).[4][5][6][7][9]

    Located in the outermost part of the main-belt, the asteroid is a member of the Hilda family, a large group of asteroids that are thought to have originated from the Kuiper belt. They orbit in a 3:2 orbital resonance with the gas giant Jupiter, meaning that for every 2 orbits Jupiter completes around the Sun, a Hildian asteroid will complete 3 orbits.[1] The asteroid's orbit does not cross the path of any of the planets and therefore it will not be pulled out of orbit by Jupiter's gravitational field. As a result of this, it is likely that the asteroid will remain in a stable orbit for thousands of years.

    It was named after the northern Finnish town Oulu, the birthplace of the discoverer.[2]

    References

    1. 1 2 3 4 5 6 "JPL Small-Body Database Browser: 1512 Oulu (1939 FE)" (2015-11-20 last obs.). Jet Propulsion Laboratory. Retrieved 27 April 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1512) Oulu. Springer Berlin Heidelberg. p. 120. ISBN 978-3-540-29925-7. Retrieved December 2015.
    3. 1 2 "LCDB Data for (1512) Oulu". Asteroid Lightcurve Database (LCDB). Retrieved December 2015.
    4. 1 2 3 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved December 2015.
    5. 1 2 3 Shevchenko, Vasilij G.; Tedesco, Edward F. (September 2006). "Asteroid albedos deduced from stellar occultations". Icarus 184 (1): 211–220. Bibcode:2006Icar..184..211S. doi:10.1016/j.icarus.2006.04.006. Retrieved December 2015.
    6. 1 2 3 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved December 2015.
    7. 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 December 2015.
    8. 1 2 Galad, Adrian; Kornos, Leonard; Vilagi, Jozef (January 2010). "An Ensemble of Lightcurves from Modra". The Minor Planet Bulletin 37 (1): 9–15. Bibcode:2010MPBu...37....9G. ISSN 1052-8091. Retrieved December 2015.
    9. 1 2 Mainzer, A.; Grav, T.; Masiero, J.; Bauer, J.; Wright, E.; Cutri, R. M.; et al. (August 2011). "Thermal Model Calibration for Minor Planets Observed with Wide-field Infrared Survey Explorer/NEOWISE". The Astrophysical Journal 736 (2): 9. Bibcode:2011ApJ...736..100M. doi:10.1088/0004-637X/736/2/100. Retrieved December 2015.
    10. ↑ "1512 Oulu (1939 FE)". Minor Planet Center. Retrieved December 2015.
    11. ↑ "JPL Small-Body Database Search Engine: spec. type = P (Tholen)". JPL Solar System Dynamics. Retrieved 2015-06-17.

    External links

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