4 Vesta

4 Vesta

below, and its rim rises 4-12 km above the surrounding terrain, with total surface relief of about 25 km. A central peak rises deep are also present. A dark albedo feature about across has been named "Olbers" in honour of Vesta's discoverer, but it does not appear in elevation maps as a fresh crater would, and its nature is presently unknown, perhaps an old basaltic surface.B. J. Zellner et al "Hubble Space Telescope Images of Asteroid Vesta in 1994", Icarus, Vol. 128, p. 83 (1997).] It serves as a reference point with the 0° longitude prime meridian defined to pass through its center.

The eastern and western hemispheres show markedly different terrains. From preliminary spectral analyses of the Hubble Space Telescope images, the eastern hemisphere appears to be some kind of high albedo, heavily cratered "highland" terrain with aged regolith, and craters probing into deeper plutonic layers of the crust. On the other hand, large regions of the western hemisphere are taken up by dark geologic units thought to be surface basalts, perhaps analogous to the lunar maria.


Some small solar system objects are believed to be fragments of Vesta caused by collisions. The Vestoid asteroids and HED meteorites are examples. The V-type asteroid 1929 Kollaa has been determined to have a composition akin to cumulate eucrite meteorites, indicating its origin deep within Vesta's crust.M. S. Kelley et al "Quantified mineralogical evidence for a common origin of 1929 Kollaa with 4 Vesta and the HED meteorites", Icarus, Vol. 165, p. 215 (2003).]

Because a number of meteorites are believed to be Vestian fragments, Vesta is currently one of only five identified Solar system bodies for which we have physical samples, the others being Mars, the Moon, comet Wild 2, and Earth itself.


The first space mission to Vesta will be NASA's "Dawn" probe--launched on September 27, 2007--which will orbit the asteroid for nine months from August 2011 until May 2012. Dawn will then proceed to its other target, Ceres and will probably continue to explore the asteroid belt on an extended mission using remaining fuel. The spacecraft is the first that can enter and leave orbit around more than one body, thanks to its weight-efficient ion driven engines.

NASA attempted to cancel Dawn in 2006, citing budget pressures and technical issues, but scientists appealed and won an additional $100 million to continue the program. Total mission costs will now be about $450 million.


Its size and unusually bright surface make Vesta the brightest asteroid, and it is occasionally visible to the naked eye from dark (non-light polluted) skies. In May and June 2007, Vesta reached a peak .]

Less favourable oppositions during late autumn in the Northern Hemisphere still have Vesta at a magnitude of around +7.0. Even when in conjunction with the Sun, Vesta will have a magnitude around +8.5; thus from a pollution-free sky it can be observed with binoculars even at elongations much smaller than near opposition. [ [http://homepage.mac.com/andjames/PageVesta000.htm VESTA] ]

See also

* 3103 Eger
* 4055 Magellan
* 3908 Nyx
* 3551 Verenia
* V-type asteroid
* HED meteorites
* Diogenite
* Eucrite
* Howardite
* Asteroids in fiction
* List of Solar System bodies formerly considered planets

Notes and references


General references

* – Horizons can be used to obtain a current ephemeris
* K. Keil, "Geological History of Asteroid 4 Vesta: The Smallest Terrestrial Planet" in Asteroids III, William Bottke, Alberto Cellino, Paolo Paolicchi, and Richard P. Binzel, (Editors), Univ. of Arizona Press (2002), ISBN 0-8165-2281-2

External links

* NASA video clips of [http://hubblesite.org/newscenter/archive/releases/solar-system/asteroid/2007/27/video/ Vesta rotating in color]
* Views of the Solar System: [http://www.solarviews.com/eng/vesta.htm Vesta]
* [http://hubblesite.org/newscenter/newsdesk/archive/releases/1995/40/ HubbleSite] : Hubble Maps the Asteroid Vesta
* [http://www.britannica.com/eb/article-9075181/Vesta Encyclopaedia Britannica, Vesta - full article]
* [http://hubblesite.org/newscenter/newsdesk/archive/releases/1997/27/ HubbleSite] : Hubble Reveals Huge Crater on the Surface of the Asteroid Vesta
* [http://hubblesite.org/newscenter/newsdesk/archive/releases/1995/20/video/a HubbleSite] : short movie composed from Hubble Space Telescope images from November 1994.
* Adaptive optics views of Vesta from [http://www2.keck.hawaii.edu/ao/vesta-ao.html Keck Observatory]
* [http://hubblesite.org/newscenter/newsdesk/archive/releases/1995/20/image/c Differentiated interior] of Vesta
* [http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=4;orb=1 Orbital simulation] from JPL (Java)
* [http://www.spacetelescope.org/images/archive/freesearch/4+vesta/viewall/1 4 Vesta images at ESA/Hubble]
* [http://planetary.org/blog/article/00001013/ Hubble views of Vesta on the Planetary Society Weblog] "(includes animation)"
* cite web
last=Farinella | first=Paolo | year=2005
title=Houston: Focus on Vesta and the HEDs
publisher=Arkansas Center for Space & Planetary Sciences

Wikimedia Foundation. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • Vesta (mythologie) — Vesta Pour les articles homonymes, voir Vesta (homonymie). Vesta …   Wikipédia en Français

  • Vesta Tilley — Tarjetas de Vesta Tilley como ella y en un papel masculino Nombre real Matilda Alice Powles Nacimiento 13 de mayo de …   Wikipedia Español

  • Vesta — may refer to: * Vesta (mythology), a goddess in Roman mythology * 4 Vesta, an asteroid named after the Roman deity * Vesta family, a group of asteroids that includes 4 Vesta * Vesta (rocket), a French sounding rocketPlaces;Italy * Vesta, Italy, a …   Wikipedia

  • Vesta Tilley — Cards of Vesta Tilley, out of drag and in a male role Born Matilda Alice Powles 13 May 1864(1864 05 13) Commandery Street, Worcest …   Wikipedia

  • VESTA (religion romaine) — VESTA, religion romaine Déesse du feu et du foyer, Vesta est d’origine indo européenne (ainsi que le prouve la comparaison de cette divinité avec l’Hestia des Grecs et l’Agni de l’Inde); le fait qu’elle soit invoquée à la fin de toute prière… …   Encyclopédie Universelle

  • Vesta Williams — (born 1963, Coshocton, Ohio) is an American R B singer. She is sometimes credited by her full name and sometimes simply as Vesta. She is known for her full four octave voice range.CareerThe daughter of a disc jockey, Williams began performing at… …   Wikipedia

  • Vesta (Begriffsklärung) — Vesta bezeichnet Vesta, eine römische Göttin (4) Vesta, ein nach der Göttin benannter Asteroid Vesta (Rakete), eine französische Höhenforschungsrakete, KFNB – Atlas und Vesta und KFNB Ia, österreichische Lokomotiven Vesta (Italien), Ort am… …   Deutsch Wikipedia

  • Vesta (Minnesota) — Vesta Ciudad de los Estados Unidos …   Wikipedia Español

  • Vesta (mythology) — Vesta was the virgin goddess of the hearth, home, and family in Roman mythology. Although she is often mistaken as analogous to Hestia in Greek mythology; she had a large, albeit mysterious role in Roman religion long before she appeared in… …   Wikipedia

  • Vesta (Software configuration management) — Vesta is a software configuration management system released by Compaq under the LGPL. Compaq claims that Vesta is a mature system and is the result of over 10 years of research and development at the Compaq/Digital Systems Research Center.… …   Wikipedia

  • VESTA — Saturni filia ex Ope, testibus Diodor. Siculô et Apollodorô, secundum Q Fabium Victorem Iani uxor: quamquam a Poetis non raro pro terra sumitur, sive quod omnibus terrâ vestiatur, sive quod vi sua stet. Ovid. l. 6. Fast. . 299. Stat vi Terra suâ; …   Hofmann J. Lexicon universale

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”