9069 Hovland

9069 Hovland
Discovery [1]
Discovered by E. F. Helin
Discovery site Palomar Obs.
Discovery date 16 July 1993
Designations
MPC designation 9069 Hovland
Named after
 Larry E. Hovland
(JPL engineer)[2]
1993 OV · 1991 XF5
main-belt (inner) · Hungaria [3]
Orbital characteristics [1]
Epoch 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc 24.04 yr (8,782 days)
Aphelion 2.1388 AU
Perihelion 1.6871 AU
1.9130 AU
Eccentricity 0.1180
2.65 yr (966 days)
349.17°
Inclination 19.571°
247.93°
171.08°
Known satellites 1 [4][lower-alpha 1]
Physical characteristics
Dimensions 2.9±0.4 km[5]
3.51 km (calculated)[3]
4.217 h[5]
4.2173±0.0001 h[6]
4.2158±0.0001 h[7]
4.2174±0.0002 h[lower-alpha 1]
4.2174±0.0007 h[8]
0.373±0.089[5]
0.3 (assumed)[3]
E [3]
14.2[1][3]
14.40[5]

    9069 Hovland, provisional designation 1993 OV, is a stony binary[lower-alpha 1] asteroid from the inner regions of the asteroid belt, about 3 kilometers in diameter. It was discovered by American female astronomer Eleanor Helin at the U.S. Palomar Observatory in California, on 16 July 1993.[9]

    The bright E-type asteroid is a member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. It orbits the Sun at a distance of 1.7–2.1 AU once every 2 years and 8 months (966 days). Its orbit shows an eccentricity of 0.12 and an inclination of 20 degrees from the plane of the ecliptic.[1]

    Several photometric light-curve analysis from the Spitzer Space Telescope and other ground-based observations including the U.S Palmer Divide Observatory (PDO), Colorado, rendered a well-defined rotation period of 4.2158±0.0001 hours (most recent observation) with a very low brightness amplitude in the range between 0.008 and 0.011 in magnitude. Such a low amplitude typically means that the asteroid has a nearly spheroidal shape. In 2004, PDO reported the discovery of an asteroid moon making the asteroid a binary system. The moon's orbital period has since been measured to take 30.292, 30.34 and 30.35 hours, respectively, for a full orbit around its primary.[4][5][6][8]

    While Spitzer and others gave it a high albedo of 0.373, with a corresponding diameter of 2.9 kilometers, the Collaborative Asteroid Lightcurve Link assumes a more typical albedo of 0.30, calculating therefore a somewhat larger diameter of 3.5 kilometers, as the lower the body's reflectivity (albedo), the larger its diameter for a given absolute brightness (magnitude).[3][5]

    The minor planet was named in honor of Larry E. Hovland (b. 1947), who is a senior engineer at the Jet Propulsion Laboratory responsible for the Raman spectrometer electronics and the Mars 2005 Op-Nav camera electronics. He generously provided his expertise to the discoverer in her early efforts to convert from photographic to electronic detection methods.[2]

    References

    1. 1 2 3 Warner (2004e) web: rotation period 4.2174±0.0002 hours with a brightness amplitude of 0.08 mag. In 2004, Warner also reported it to be a binary system, yet no light-curve was published at the time. The orbital period of the secondary has been measured to amount to 30.35 hours. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (9069) Hovland
    1. 1 2 3 4 "JPL Small-Body Database Browser: 9069 Hovland (1993 OV)" (2015-12-17 last obs.). Jet Propulsion Laboratory. Retrieved January 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (9069) Hovland. Springer Berlin Heidelberg. p. 677. ISBN 978-3-540-00238-3. Retrieved January 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (9069) Hovland". Asteroid Lightcurve Database (LCDB). Retrieved January 2016.
    4. 1 2 Johnston, Robert. "(9069) Hovland". johnstonsarchive.net. Retrieved 29 May 2015.
    5. 1 2 3 4 5 6 Marchis, F.; Enriquez, J. E.; Emery, J. P.; Mueller, M.; Baek, M.; Pollock, J.; et al. (November 2012). "Multiple asteroid systems: Dimensions and thermal properties from Spitzer Space Telescope and ground-based observations". Icarus 221 (2): 1130–1161. arXiv:1604.05384. Bibcode:2012Icar..221.1130M. doi:10.1016/j.icarus.2012.09.013. Retrieved January 2016.
    6. 1 2 Warner, Brian D.; Pravec, Petr; Kusnirak, Peter; Harris, Alan W.; Cooney, Walter R., Jr.; Gross, John; et al. (April 2011). "Lightcurves from the Initial Discovery of Four Hungaria Binary Asteroids". The Minor Planet Bulletin 38 (2): 107–109. Bibcode:2011MPBu...38..107W. ISSN 1052-8091. Retrieved January 2016.
    7. ↑ Behrend, Raoul. "Asteroids and comets rotation curves – (9069) Hovland". Geneva Observatory. Retrieved January 2016.
    8. 1 2 Warner, Brian D. (April 2013). "Seeing Double Old and New: Observations and Lightcurve Analysis at the Palmer Divide Observatory of Six Binary Asteroids". The Minor Planet Bulletin 40 (2): 94–98. Bibcode:2013MPBu...40...94W. ISSN 1052-8091. Retrieved January 2016.
    9. ↑ "9069 Hovland (1993 OV)". Minor Planet Center. Retrieved January 2016.

    External links


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