1524 Joensuu

1524 Joensuu
Discovery [1]
Discovered by Y. Väisälä
Discovery site Turku Observatory
Discovery date 18 September 1939
Designations
MPC designation 1524 Joensuu
Named after
 Joensuu
(Finnish town)[2]
1939 SB · 1931 EL
1933 QO · 1936 DG
1958 DH1
main-belt · (outer) [3]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 84.61 yr (30903 days)
Aphelion 3.4891 AU (521.96 Gm)
Perihelion 2.7307 AU (408.51 Gm)
3.1099 AU (465.23 Gm)
Eccentricity 0.12193
5.48 yr (2003.2 d)
16.665°
0° 10m 46.956s / day
Inclination 12.687°
347.73°
2.9030°
Earth MOID 1.72381 AU (257.878 Gm)
Jupiter MOID 1.92643 AU (288.190 Gm)
Jupiter Tisserand parameter 3.170
Physical characteristics
Dimensions 42.79 km[4]
44.87±0.78 km[5]
49.394±0.502 km[6]
45.06±0.29 km[7]
42.87 km (derived)[3]
Mean radius
 21.395±0.55 km
9.276 h (0.3865 d)[1][8]
0.0462[4]
0.043±0.002[5]
0.0347±0.0053[6]
0.050±0.008[7]
0.0553 (derived)[3]
0.0462±0.002[1]
C [3]
10.7[1]

    1524 Joensuu, provisional designation 1939 SB, is a carbonaceous asteroid from the outer region of the asteroid belt, about 43 kilometers in diameter. It was discovered by Finnish astronomer Yrjö Väisälä at the Turku Observatory in Southwest Finland, on 18 September 1939.[9]

    The dark C-type asteroid orbits the Sun at a distance of 2.7–3.5 AU once every 5 years and 6 months (2,003 days). Its orbit shows an eccentricity of 0.12 and is tilted by 13 degrees to the plane of the ecliptic. It has a rotation period of 9.3 hours[8] and an albedo in the range of 0.03 to 0.06, according to the surveys carried out by IRAS, Akari, WISE and NEOWISE.[4][5][6][7]

    The minor planet was named for the Finnish town Joensuu, where the discoverer received his early schooling. It is located in North Karelia, near the Russian border.[2]

    References

    1. 1 2 3 4 5 "JPL Small-Body Database Browser: 1524 Joensuu (1939 SB)" (2015-10-23 last obs.). Jet Propulsion Laboratory. Retrieved 27 April 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1524) Joensuu. Springer Berlin Heidelberg. p. 121. ISBN 978-3-540-29925-7. Retrieved 7 December 2015.
    3. 1 2 3 4 "LCDB Data for (1524) Joensuu". Asteroid Lightcurve Database (LCDB). Retrieved 7 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 7 December 2015.
    5. 1 2 3 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; 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 7 December 2015.
    6. 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 7 December 2015.
    7. 1 2 3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; et al. (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:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 7 December 2015.
    8. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1524) Joensuu". Geneva Observatory. Retrieved 7 December 2015.
    9. ↑ "1524 Joensuu (1939 SB)". Minor Planet Center. Retrieved 7 December 2015.

    External links


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