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 · Hungaria [3]
Orbital characteristics [1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 24.46 yr (8,933 days)
Aphelion 2.1395 AU
Perihelion 1.6864 AU
1.9129 AU
Eccentricity 0.1184
2.65 yr (966 days)
212.59°
0° 22m 21s / day
Inclination 19.575°
247.91°
171.16°
Known satellites 1 [4][lower-alpha 1]
Earth MOID 0.7014 AU
Physical characteristics
Dimensions 2.9±0.4 km[5]
3.51 km (calculated)[3]
4.2158±0.0001 h[6]
4.217 h[5]
4.2173±0.0001 h[7]
4.2174±0.0007 h[8]
0.3 (assumed)[3]
0.373±0.089[5]
E [3]
14.2[1][3] · 14.40±0.03[5]

    9069 Hovland, provisional designation 1993 OV, is a stony binary[lower-alpha 1] Hungaria asteroid from the inner regions of the asteroid belt, approximately 3 kilometers in diameter. It was discovered on 16 July 1993, by American female astronomer Eleanor Helin at the U.S. Palomar Observatory in California.[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 has an eccentricity of 0.12 and an inclination of 20° with respect to the ecliptic.[1] The first identification was made at ESO's La Silla site in 1991, extending the asteroid's observation arc by about 2 years prior to its discovery.[9]

    Several rotational light-curves for this asteroid were obtained from photometric observations. These light-curves gave a well-defined rotation period of 4.216 to 4.217 hours and a low brightness variation between 0.008 and 0.011 in magnitude, indicating a nearly spheroidal shape (U=2/3/3/3/3).[5][6][7][lower-alpha 1][8]

    According to the space-based Spitzer Space Telescope, the asteroid has a high albedo of 0.373 and a diameter of 2.9 kilometers, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for members of the Hungaria family of 0.30, and calculates a diameter of 3.5 kilometers.[3][5]

    In 2004, the U.S Palmer Divide Observatory, Colorado, 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][7][8]

    The minor planet was named in honor of JPL engineer Larry E. Hovland (b. 1947), who oversees the electronics of the Raman spectrometer and the Mars 2005 optical navigation camera. He helped the discoverer to transition from photographic to electronic detection methods.[2] Naming citation was published on 9 May 2001 (M.P.C. 42669).[10]

    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)" (2016-05-16 last obs.). Jet Propulsion Laboratory. Retrieved 4 December 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 4 July 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (9069) Hovland". Asteroid Lightcurve Database (LCDB). Retrieved 4 July 2016.
    4. 1 2 Johnston, Robert. "(9069) Hovland". johnstonsarchive.net. Retrieved 29 May 2015.
    5. 1 2 3 4 5 6 7 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:1604.05384Freely accessible. Bibcode:2012Icar..221.1130M. doi:10.1016/j.icarus.2012.09.013. Retrieved 4 July 2016.
    6. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (9069) Hovland". Geneva Observatory. Retrieved 4 July 2016.
    7. 1 2 3 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 4 July 2016.
    8. 1 2 3 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 4 July 2016.
    9. 1 2 "9069 Hovland (1993 OV)". Minor Planet Center. Retrieved 4 July 2016.
    10. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 4 July 2016.

    External links

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