69 Hesperia
|
A three-dimensional model of 69 Hesperia based on its light curve. | |
| Discovery | |
|---|---|
| Discovered by | G. Schiaparelli |
| Discovery date | April 29, 1861[1] |
| Designations | |
Named after | Hesperia |
| Main belt | |
| Orbital characteristics | |
| Epoch (absent) | |
| Aphelion | 519.3 Gm (3.471 AU) |
| Perihelion | 372.3 Gm (2.489 AU) |
| 445.8 Gm (2.980 AU) | |
| Eccentricity | 0.165 |
| 1879 d (5.14 a) | |
| Inclination | 8.59° |
| Physical characteristics | |
| Dimensions |
138 km (IRAS)[2] 135x106x98 km[3] 110 ± 15 km[3] |
| Mass | (5.86 ± 1.18) × 1018 kg[4] |
Mean density | 4.38 ± 0.99[4] g/cm3 |
| 5.655 h[2] | |
| Albedo | 0.140[2] |
Spectral type | M |
| 7.05[2] | |
|
| |
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69 Hesperia (/hɛsˈpɪəriə/ hes-PEER-ee-ə) is a large, M-type main-belt asteroid. It was discovered by the Italian astronomer Giovanni Schiaparelli on April 29, 1861[1] from Milan. It was his only asteroid discovery. Schiaparelli named it Hesperia in honour of Italy (the word is a Greek term for the peninsula).[5]
Hesperia was observed by Arecibo radar in February 2010.[3] Radar observations combined with lightcurve-based shape models, lead to a diameter estimate of 110 ± 15 km (68 mi ± 9 mi).[3]
References
- 1 2 "Editorial Notice" (PDF). The Minor Planet Circulars. MPC 94743-95312: 94743. 2015-08-29. Retrieved 4 September 2015.
- 1 2 3 4 "JPL Small-Body Database Browser: 69 Hesperia" (2011-09-07 last obs). Jet Propulsion Laboratory. Retrieved 2012-01-27.
- 1 2 3 4 Shepard, 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. Bibcode:2011Icar..215..547S. doi:10.1016/j.icarus.2011.07.027.
- 1 2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336
, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1. - ↑ Lutz D. Schmadel, Dictionary of Minor Planet Names, p.22.
External links
- Orbital simulation from JPL (Java) / Ephemeris
- Bareket Observatory (Asteroid 69 Hesperia movie - through an Earth-based telescope.) (Hebrew)
- 69 Hesperia at the JPL Small-Body Database
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