69 Hesperia
From Wikipedia, the free encyclopedia
| Discovery | |
|---|---|
| Discovered by | G. Schiaparelli |
| Discovery date | April 26, 1861 |
| Designations | |
| Named after | Hesperia |
| Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch (absent) | |
| Aphelion | 519.3 Gm (3.471 AU) |
| Perihelion | 372.3 Gm (2.489 AU) |
| Semi-major axis | 445.8 Gm (2.980 AU) |
| Eccentricity | 0.165 |
| Orbital period | 1879 d (5.14 a) |
| Inclination | 8.59° |
| Physical characteristics | |
| Dimensions |
138 km (IRAS)[1] 135x106x98 km[2] 110 ± 15 km[2] |
| Mass | (5.86 ± 1.18) × 1018[3] kg |
| Mean density | 4.38 ± 0.99[3] g/cm3 |
| Rotation period | 5.655 h[1] |
| Albedo | 0.140[1] |
| Spectral type | M |
| Absolute magnitude (H) | 7.05[1] |
|
| |
69 Hesperia (/hɛsˈpɪəriə/ hes-PEER-ee-ə) is a large, M-type main-belt asteroid. It was discovered by the famous Italian astronomer Giovanni Schiaparelli on April 26, 1861 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).[4]
Hesperia was observed by Arecibo radar in February 2010.[2] Radar observations combined with lightcurve-based shape models, lead to a diameter estimate of 110 ± 15 km.[2]
References
- ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 69 Hesperia". Jet Propulsion Laboratory. 2011-09-07 last obs. Retrieved 2012-01-27.
- ↑ 2.0 2.1 2.2 2.3 Shepard, Michael K.; Harris, Alan W.; Taylor, Patrick A.; Clark, Beth Ellen; Ockert-Bell, Maureen; Nolan, Michael C.; Howell, Ellen S.; Magri, Christopher; Giorgini, Jon D.; Benner, Lance A. M. (2011). "Radar observations of Asteroids 64 Angelina and 69 Hesperia". Icarus 215 (2): 547–551. Bibcode:2011Icar..215..547S. doi:10.1016/j.icarus.2011.07.027.
- ↑ 3.0 3.1 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 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)
| |||||
| ||||||||||||||||||||||
This article is issued from Wikipedia. The text is available under the Creative Commons Attribution/Share Alike; additional terms may apply for the media files.