astro.wikisort.org - AsteroidHesperia (minor planet designation: 69 Hesperia) is a large, M-type main-belt asteroid. It was discovered by the Italian astronomer Giovanni Schiaparelli on April 29, 1861[1] from Milan, while he was searching for the recently discovered 63 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 the Sun with a period of 5.14 years, a semimajor axis of 2.980 AU, and eccentricity of 0.165. The orbital plane is inclined by an angle of 8.59° to the plane of the ecliptic.
Main-belt asteroid
69 Hesperia A three-dimensional model of 69 Hesperia based on its light curve. |
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Discovered by | G. Schiaparelli |
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Discovery date | April 29, 1861[1] |
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MPC designation | (69) Hesperia |
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Pronunciation | [2] |
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Named after | Hesperia |
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Minor planet category | Main belt |
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Adjectives | Hesperian [3] |
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Epoch (absent) |
Aphelion | 3.471 AU (519.3 Gm) |
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Perihelion | 2.489 AU (372.3 Gm) |
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Semi-major axis | 2.980 AU (445.8 Gm) |
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Eccentricity | 0.165 |
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Orbital period (sidereal) | 1,879 days (5.14 a) |
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Inclination | 8.59° |
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Dimensions | 138 km (IRAS)[4] 110 ± 15 km[5] |
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Mass | (5.86±1.18)×1018 kg[6] |
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Mean density | 4.38±0.99 g/cm3[6] |
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Synodic rotation period | 5.655 h[4] |
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Geometric albedo | 0.140[4] |
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Spectral type | M |
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Absolute magnitude (H) | 7.05[4] |
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Hesperia was observed by Arecibo radar in February 2010.[5] Radar observations combined with lightcurve-based shape models, lead to a diameter estimate of 110 ± 15 km (68 ± 9.3 mi). The radar albedo is consistent with a high-metal M-type asteroid.[5] In the near infrared, a weak absorption feature near a wavelength of 0.9 μm can be attributed to orthopyroxenes on the surface.[9] A meteorite analogue of the reflectance spectra from 69 Hesperia is the Hoba ataxite.[10]
References
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"Editorial Notice" (PDF). The Minor Planet Circulars. MPC 94743-95312: 94743. 29 August 2015. Retrieved 4 September 2015.
- Noah Webster (1884) A Practical Dictionary of the English Language
- "Hesperian". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- "JPL Small-Body Database Browser: 69 Hesperia" (2011-09-07 last obs). Jet Propulsion Laboratory. Retrieved 27 January 2012.
- 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. arXiv:1104.4114. Bibcode:2011Icar..215..547S. doi:10.1016/j.icarus.2011.07.027.
- Carry, 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.
- De Meis, S. (2011), "A few aspects of Schiaparelli's studies", Memorie della Societa Astronomica Italiana, 82: 290, Bibcode:2011MmSAI..82..290D.
- Schmadel, Lutz D. (2003), Dictionary of Minor Planet Names, Springer Science & Business Media, p. 22, ISBN 978-3-540-00238-3.
- 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.
- 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.
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На других языках
[de] (69) Hesperia
(69) Hesperia ist ein Asteroid des Asteroiden-Hauptgürtels, der am 29. April 1861 von Giovanni Schiaparelli entdeckt wurde.
- [en] 69 Hesperia
[es] (69) Hesperia
(69) Hesperia es un asteroide perteneciente al cinturón de asteroides descubierto el 29 de abril de 1861[nota 1] por Giovanni Virginio Schiaparelli desde el observatorio astronómico de Brera en Milán, Italia. Está nombrado por Hesperia, un nombre griego de la península italiana.[4]
[ru] (69) Гесперия
(69) Гесперия (лат. Hesperia) — астероид главного пояса, который принадлежит к спектральному классу M. Он был открыт 26 апреля 1861 года итальянским астрономом Джованни Скиапарелли в Брерской обсерватории и назван в честь дочери Нюкты и Океана, одной из гесперид в древнегреческой мифологии. Однако это название также может быть связано с Италией, поскольку древние греки этим термином называли Апеннинский полуостров[3].
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