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69 Hesperia

Main-belt asteroid

Field	Value
minorplanet	yes
background	#D6D6D6
name	69 Hesperia
image	69Hesperia (Lightcurve Inversion).png
caption	A three-dimensional model of 69 Hesperia based on its light curve.
discoverer	G. Schiaparelli
discovered	April 29, 1861
mpc_name	(69) Hesperia
pronounced
adjective	Hesperian
named_after	Hesperia
mp_category	Main belt
epoch	(absent)
semimajor	2.980 AU
perihelion	2.489 AU
aphelion	3.471 AU
eccentricity	0.165
period	1879 d
inclination	8.59°
asc_node	184.99°
arg_peri	288.8°
dimensions	138 km (IRAS)
110 ± 15 km
mass
density
rotation	5.655 h
spectral_type	M
abs_magnitude	7.05
albedo	0.140

110 ± 15 km

69 Hesperia is a large, M-type main-belt asteroid. It was discovered by the Italian astronomer Giovanni Schiaparelli on April 29, 1861 from Milan, while he was searching for the recently discovered 63 Ausonia. It was his only asteroid discovery. Schiaparelli named it Hesperia in honour of Italy (the word is a Greek term for the peninsula). The asteroid is orbiting the Sun with a period of 1879 d, a semimajor axis of , and eccentricity of 0.165. The orbital plane is inclined by an angle of 8.59° to the plane of the ecliptic.

Hesperia was observed by Arecibo radar in February 2010. Radar observations combined with lightcurve-based shape models, lead to a diameter estimate of 110 +/-. The radar albedo is consistent with a high-metal M-type asteroid. In the near infrared, a weak absorption feature near a wavelength of 0.9 μm can be attributed to orthopyroxenes on the surface. A meteorite analogue of the reflectance spectra from 69 Hesperia is the Hoba ataxite.

References

Bareket Observatory (Asteroid 69 Hesperia movie - through an Earth-based telescope.)

References

Noah Webster (1884) ''A Practical Dictionary of the English Language''
{{OED. Hesperian

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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