69 Hesperia

Hesperia (/hɛsˈpɪəriə/ hes-PEER-ee-ə; 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. 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 ± 9.3 mi).[3] In the near infrared, a weak absorption feature near a wavelength of 0.9 μm can be attributed to orthopyroxenes on the surface.[6] A meteorite analogue of the reflectance spectra from 69 Hesperia is the Hoba ataxite.[7]

69 Hesperia
69Hesperia (Lightcurve Inversion)
A three-dimensional model of 69 Hesperia based on its light curve.
Discovered byG. Schiaparelli
Discovery dateApril 29, 1861[1]
MPC designation(69) Hesperia
Named after
Main belt
Orbital characteristics
Epoch (absent)
Aphelion3.471 AU (519.3 Gm)
Perihelion2.489 AU (372.3 Gm)
2.980 AU (445.8 Gm)
1,879 days (5.14 a)
Physical characteristics
Dimensions138 km (IRAS)[2]
135x106x98 km[3]
110 ± 15 km[3]
Mass(5.86±1.18)×1018 kg[4]
Mean density
4.38±0.99 g/cm3[4]
5.655 h[2]


  1. ^ a b "Editorial Notice" (PDF). The Minor Planet Circulars. MPC 94743-95312: 94743. 2015-08-29. Retrieved 4 September 2015.
  2. ^ a b c d "JPL Small-Body Database Browser: 69 Hesperia" (2011-09-07 last obs). Jet Propulsion Laboratory. Retrieved 2012-01-27.
  3. ^ a b c d 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.
  4. ^ a b 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.
  5. ^ Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names. Springer Science & Business Media. p. 22. ISBN 978-3-540-00238-3.
  6. ^ 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.
  7. ^ 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



was a common year starting on Tuesday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1861st year of the Common Era (CE) and Anno Domini (AD) designations, the 861st year of the 2nd millennium, the 61st year of the 19th century, and the 2nd year of the 1860s decade. As of the start of 1861, the Gregorian calendar was

12 days ahead of the Julian calendar, which remained in localized use until 1923.

64 Angelina

Angelina (minor planet designation: 64 Angelina) is an asteroid from the central region of the asteroid belt, approximately 50 kilometers in diameter. It is an unusually bright form of E-type asteroid.

68 Leto

Leto ( LEE-toh; Greek: Λητώ; minor planet designation: 68 Leto) is a large main belt asteroid. Its spectral type is S. It was discovered by Robert Luther on April 29, 1861. The asteroid is named after Leto, the mother of Apollo and Artemis in Greek mythology.

70 Panopaea

Panopaea ( PAN-ə-PEE-ə; minor planet designation: 70 Panopaea) is a large main belt asteroid. Its orbit is close to those of the Eunomia asteroid family; however, Panopaea is a dark, primitive carbonaceous C-type asteroid in contrast to the S-type asteroids of the Eunomian asteroids. The spectra of the asteroid displays evidence of aqueous alteration. Photometric studies give a rotation period of 15.797 hours and an amplitude of 0.11±0.01 in magnitude. Previous studies that suggested the rotation period may be twice this amount were rejected based upon further observation.Panopaea was discovered by Hermann Goldschmidt on 5 May 1861. It was his fourteenth and last asteroid discovery. It is named after Panopea, a nymph in Greek mythology; the name was chosen by Robert Main, President of the Royal Astronomical Society. In 1862, Swedish astronomer Nils Christoffer Dunér gave a doctoral thesis on the orbital elements of this asteroid.The orbit of 70 Panopaea places it in a mean motion resonance with the planets Jupiter and Saturn. The computed Lyapunov time for this asteroid is 24,000 years, indicating that it occupies a chaotic orbit that will change randomly over time because of gravitational perturbations of the planets.The asteroid frequently makes close approaches with 16 Psyche, such as on June 12, 2040 when it will make a close approach of 0.00602 AU (2.34 Lunar distances, or approx. 770,000 km, 478,455 mi) to the asteroid, and on June 2, 2095 when it will come only 0.003372 AU (1.31 LD) to the asteroid.

Giovanni Schiaparelli

Giovanni Virginio Schiaparelli, (Italian: [dʒoˈvanːi virˈdʒiːnjo skjapaˈrɛlːi]; 14 March 1835 – 4 July 1910) was an Italian astronomer and science historian.


Hesperia may refer to:

Hesperia (Greek mythology)

Hesperia (actress), Italian actress

Hesperia, California, a city in the United States

Hesperia, Michigan, a village in the United States

69 Hesperia, an asteroid

Hesperia Planum, a region of Mars

Hesperia (butterfly) (branded skippers), a genus in the skippers (Hesperiidae) family

Hesperia (journal), an academic journal of Classical archaeology

Hesperian Foundation, an NGO which publishes Health guides

Hesperia Hotels, Spanish hotel chain owned by NH Hoteles group

USS Hesperia (AKS-13), a general stores issue ship

List of instrument-resolved minor planets

The following list of instrument-resolved minor planets consists of minor planets whose disks have been resolved, whether by telescope, a visit by an unmanned spacecraft, or by observing the occultation of a background star from multiple sites. Disk resolution allows the density of an body to be computed, providing useful information about the internal composition. It can also be used to determine the shape of the object, to search for albedo features, and to look for companions.

Minor planets

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