1568 Aisleen

1568 Aisleen

Light curve-based 3D-model of 568 Aisleen
Discovery [1]
Discovered by E. L. Johnson
Discovery site Johannesburg Obs.
Discovery date 21 August 1946
Designations
MPC designation 1568 Aisleen
Named after
 Aisleen Johnson
(discoverer's wife)[2]
1946 QB
main-belt · Phocaea [3][4]
Orbital characteristics [1]
Epoch 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc 69.22 yr (25,283 days)   
Aphelion 2.9494 AU
Perihelion 1.7541 AU
2.3517 AU
Eccentricity 0.2541
3.61 yr (1,317 days)
3.5389°
Inclination 24.896°
146.24°
228.72°
Physical characteristics
Dimensions 14.04±0.96 km[5]
11.983±0.072 km[6]
12.67 km (calculated)[3]
6.683±0.005 h[7]
6.68±0.02 h[8]
6.67597±0.00005 h[9]
0.130±0.019[5]
0.1793±0.0322[6]
0.23 (assumed)[3]
S [3]
11.7[1]

    1568 Aisleen, provisional designation 1946 QB, is a stony asteroid from the inner regions of the asteroid belt, about 13 kilometers in diameter. It was discovered on 21 August 1946, by South African astronomer Ernest Johnson at the Union Observatory in Johannesburg, South Africa.[10]

    The S-type asteroid is a member of the Phocaea family, a group of asteroids with similar orbital characteristics.[4] It orbits the Sun at a distance of 1.8–2.9 AU once every 3 years and 7 months (1,317 days). Its orbit shows an eccentricity of 0.25 and is tilted by 25 degrees to the plane of the ecliptic.[1]

    Based upon a light-curve generated from 2001 observations, it has a rotational period of 6.68±0.02 hours during which the brightness varies by 6.68±0.05 in magnitude.[8] More recent observations confirmed the body's period.[7][9] It has an albedo of 0.13 and 0.19, according to the surveys carried out by the Japanese Akari satellite and the U.S. Wide-field Infrared Survey Explorer with its NEOWISE mission, respectively, while the Collaborative Asteroid Lightcurve Link assumes an albeo of 0.23, a more typical value for stony asteroids and identical to the asteroid family's namesake and most massive member, 25 Phocaea.[3][5][6]

    The discoverer named the asteroid after his wife, Aisleen Johnson.[2][11]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 1568 Aisleen (1946 QB)" (2015-11-10 last obs.). Jet Propulsion Laboratory. Retrieved 2 January 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1568) Aisleen. Springer Berlin Heidelberg. p. 124. ISBN 978-3-540-29925-7. Retrieved 16 October 2015.
    3. 1 2 3 4 5 "LCDB Data for (1568) Aisleen". Asteroid Lightcurve Database (LCDB). Retrieved 2 January 2016.
    4. 1 2 Carruba, Valerio; Rosa, D. A. (September 2009), "An Analysis of the Region of the Phocaea Dynamical Family", American Astronomical Society, DPS meeting #41, #27.04, Bibcode:2009DPS....41.2704C.
    5. 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 2 January 2016.
    6. 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 2 January 2016.
    7. 1 2 Warner, Brian D. (October 2014). "Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 March-June". The Minor Planet Bulletin. 41 (4): 235–241. Bibcode:2014MPBu...41..235W. ISSN 1052-8091. Retrieved 2 January 2016.
    8. 1 2 Malcolm, G. (December 2001). "Rotational Periods and Lightcurves of 1166 Sakuntala and 1568 Aisleen". The Minor Planet Bulletin. 28: 64. Bibcode:2001MPBu...28...64M. Retrieved 2 January 2016.
    9. 1 2 Hanus, J.; Durech, J.; Broz, M.; Warner, B. D.; Pilcher, F.; Stephens, R.; et al. (June 2011). "A study of asteroid pole-latitude distribution based on an extended set of shape models derived by the lightcurve inversion method". Astronomy and Astrophysics. 530: 16. arXiv:1104.4114Freely accessible. Bibcode:2011A&A...530A.134H. doi:10.1051/0004-6361/201116738. Retrieved 2 January 2016.
    10. ↑ "1568 Aisleen (1946 QB)". Minor Planet Center. Retrieved 2 January 2016.
    11. ↑ Schmadel, Lutz (2003), Dictionary of Minor Planet Names, Physics and astronomy online library, 1 (5th ed.), Springer, p. 124, ISBN 3540002383.

    External links


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