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69 Hesperia

From Wikipedia, the free encyclopedia
Main-belt asteroid

69 Hesperia
A three-dimensional model of 69 Hesperia based on its light curve.
Discovery
Discovered byG. Schiaparelli
Discovery dateApril 29, 1861[1]
Designations
(69) Hesperia
Pronunciation/hɛˈspɪəriə/[2]
Named after
Hesperia
Main belt
AdjectivesHesperian/hɛˈspɪəriən/[3]
Orbital characteristics
Epoch (absent)
Aphelion3.471 AU (519.3 Gm)
Perihelion2.489 AU (372.3 Gm)
2.980 AU (445.8 Gm)
Eccentricity0.165
1,879days (5.14 a)
Inclination8.59°
184.99°
288.8°
Physical characteristics
Dimensions138 km (IRAS)[4]
110 ± 15 km[5]
Mass(5.86±1.18)×1018 kg[6]
4.38±0.99 g/cm3[6]
5.655 h[4]
0.140[4]
M
7.05[4]

69 Hesperia is a large,M-typemain-beltasteroid. It was discovered by theItalian astronomerGiovanni Schiaparelli on April 29, 1861[1] fromMilan, while he was searching for the recently discovered63 Ausonia.[7] It was his only asteroid discovery. Schiaparelli named it Hesperia in honour of Italy (the word is a Greek term for the peninsula).[8] The asteroid is orbiting theSun with aperiod of 5.14 years, asemimajor axis of2.980 AU, andeccentricity of 0.165. Theorbital plane is inclined by an angle of 8.59° to theplane of the ecliptic.

Hesperia was observed byAreciboradar in February 2010.[5] Radar observations combined withlightcurve-based shape models, lead to a diameter estimate of 110 ± 15 km (68 ± 9.3 mi). The radar albedo is consistent with a high-metalM-type asteroid.[5] In thenear infrared, a weakabsorption feature near awavelength of 0.9 μm can be attributed toorthopyroxenes on the surface.[9] A meteorite analogue of the reflectance spectra from 69 Hesperia is theHobaataxite.[10]

References

[edit]
  1. ^ab"Editorial Notice"(PDF).The Minor Planet Circulars. MPC 94743-95312: 94743. 29 August 2015. Retrieved4 September 2015.
  2. ^Noah Webster (1884)A Practical Dictionary of the English Language
  3. ^"Hesperian".Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription orparticipating institution membership required.)
  4. ^abcd"JPL Small-Body Database Browser: 69 Hesperia" (2011-09-07 last obs).Jet Propulsion Laboratory. Retrieved27 January 2012.
  5. ^abcShepard, Michael K.; Harris, Alan W.; Taylor, Patrick A.; Clark, Beth Ellen; Ockert-Bell, Maureen; Nolan, Michael C.; et al. (2011)."Radar observations of Asteroids 64 Angelina and 69 Hesperia"(PDF).Icarus.215 (2):547–551.arXiv:1104.4114.Bibcode:2011Icar..215..547S.doi:10.1016/j.icarus.2011.07.027.
  6. ^abCarry, B. (December 2012), "Density of asteroids",Planetary and Space Science, vol. 73, pp. 98–118,arXiv:1203.4336,Bibcode:2012P&SS...73...98C,doi:10.1016/j.pss.2012.03.009. See Table 1.
  7. ^De Meis, S. (2011), "A few aspects of Schiaparelli's studies",Memorie della Societa Astronomica Italiana,82: 290,Bibcode:2011MmSAI..82..290D.
  8. ^Schmadel, Lutz D. (2003),Dictionary of Minor Planet Names, Springer Science & Business Media, p. 22,ISBN 978-3-540-00238-3.
  9. ^Hardersen, Paul S.; et al. (May 2005), "Near-IR spectral evidence for the presence of iron-poor orthopyroxenes on the surfaces of six M-type asteroids",Icarus,175 (1): 141−158,Bibcode:2005Icar..175..141H,doi:10.1016/j.icarus.2004.10.017.
  10. ^Neeley, J. R.; et al. (August 2014), "The composition of M-type asteroids II: Synthesis of spectroscopic and radar observations",Icarus,238: 37−50,arXiv:1407.0750,Bibcode:2014Icar..238...37N,doi:10.1016/j.icarus.2014.05.008.

External links

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