Astronomy:9069 Hovland

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9069 Hovland
Discovery [1]
Discovered byE. F. Helin
Discovery sitePalomar Obs.
Discovery date16 July 1993
Designations
(9069) Hovland
Named afterLarry E. Hovland
(JPL engineer)[2]
1993 OV · 1991 XF5
Minor planet categorymain-belt · Hungaria [3][4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc25.51 yr (9,319 days)
|{{{apsis}}}|helion}}2.1397 AU
|{{{apsis}}}|helion}}1.6865 AU
1.9131 AU
Eccentricity0.1185
Orbital period2.65 yr (966 days)
Mean anomaly287.14°
Mean motion0° 22m 21s / day
Inclination19.574°
Longitude of ascending node247.91°
171.12°
Known satellites1 [5][lower-alpha 1]
Physical characteristics
Dimensions2.9±0.4 km[6]
3.51 km (calculated)[4]
Rotation period4.2158±0.0001 h[7]
4.217 h[6]
4.2173±0.0001 h[8]
4.2174±0.0007 h[9]
Geometric albedo0.3 (assumed)[4]
0.373±0.089[6]
E [4]
Absolute magnitude (H)14.2[1][4] · 14.40±0.03[6]


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 astronomer Eleanor Helin at the Palomar Observatory in California, United States, and later named for American JPL engineer Larry Hovland.[2][3]

Orbit and classification

The bright E-type asteroid is a member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. Hovland orbits the Sun in the inner main-belt 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]

First identified as 1991 XF5 at ESO's La Silla site in December 1991, the asteroid's observation arc begins 19 months prior to its official discovery at Palomar.[3]

Rotation period

Several rotational lightcurves of Hovland were obtained from photometric observations. These lightcurves 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 ({{{1}}}).[6][7][8][lower-alpha 1][9]

Diameter and albedo

According to the space-based Spitzer Space Telescope, Hovland 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.[4][6]

Moon

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.[5][6][8][9]

Naming

This 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] The approved naming citation was published by the Minor Planet Center on 9 May 2001 (M.P.C. 42669).[10]

Notes

  1. ↑ 1.0 1.1 1.2 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

References

  1. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 9069 Hovland (1993 OV)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2009069. 
  2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(9069) Hovland". Dictionary of Minor Planet Names – (9069) Hovland. Springer Berlin Heidelberg. p. 677. doi:10.1007/978-3-540-29925-7_7355. ISBN 978-3-540-00238-3. 
  3. ↑ 3.0 3.1 3.2 "9069 Hovland (1993 OV)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=9069. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 "LCDB Data for (9069) Hovland". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=9069%7CHovland. 
  5. ↑ 5.0 5.1 Johnston, Robert. "(9069) Hovland". http://www.johnstonsarchive.net/astro/astmoons/am-09069.html. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 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. doi:10.1016/j.icarus.2012.09.013. Bibcode: 2012Icar..221.1130M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012Icar..221.1130M. Retrieved 4 July 2016. 
  7. ↑ 7.0 7.1 Behrend, Raoul. "Asteroids and comets rotation curves – (9069) Hovland". Geneva Observatory. http://obswww.unige.ch/~behrend/page5cou.html#009069. 
  8. ↑ 8.0 8.1 8.2 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. ISSN 1052-8091. Bibcode: 2011MPBu...38..107W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011MPBu...38..107W. Retrieved 4 July 2016. 
  9. ↑ 9.0 9.1 9.2 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. ISSN 1052-8091. Bibcode: 2013MPBu...40...94W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013MPBu...40...94W. Retrieved 4 July 2016. 
  10. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. 

External links



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