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Asteroide Vesta

Bryce Space posted on Jul 12, 2017
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Description


Asteroid Vesta Vesta, minor-planet designation 4 Vesta, is one of the largest objects in the asteroid belt, with a mean diameter of 525 kilometres (326 mi). It was discovered by the German astronomer Heinrich Wilhelm Olbers on 29 March 1807 and is named after Vesta, the virgin goddess of home and hearth from Roman mythology. Vesta is the second-most-massive and second-largest body in the asteroid belt after the dwarf planet Ceres, and it contributes an estimated 9% of the mass of the asteroid belt. It is slightly larger than Pallas, though significantly more massive. Vesta is the last remaining rocky protoplanet (with a differentiated interior) of the kind that formed the terrestrial planets. Numerous fragments of Vesta were ejected by collisions one and two billion years ago that left two enormous craters occupying much of Vesta's southern hemisphere. Debris from these events has fallen to Earth as howardite–eucrite–diogenite (HED) meteorites, which have been a rich source of information about Vesta. Vesta is the brightest asteroid visible from Earth. Its maximum distance from the Sun is slightly greater than the minimum distance of Ceres from the Sun, though its orbit lies entirely within that of Ceres. NASA's Dawn spacecraft entered orbit around Vesta on 16 July 2011 for a one-year exploration and left orbit on 5 September 2012 en route to its final destination, Ceres. Researchers continue to examine data collected by Dawn for additional insights into the formation and history of Vesta. _________________________________________________________ Vesta, officiellement désigné par (4) Vesta, est un astéroïde de la ceinture principale. Il fut le quatrième astéroïde découvert, le 29 mars 1807 par Heinrich Olbers, et porte le nom de la déesse romaine Vesta. Avec un diamètre moyen d'environ 530 km, Vesta est le deuxième plus gros astéroïde de la ceinture (après Cérès) et contribue pour 9 % de la masse totale de celle-ci ; ses dimensions ont pu en faire un candidat au statut de planète naine. Vesta a perdu environ 1 % de sa masse lors du choc avec un autre astéroïde, il y a moins d'un milliard d'années ; plusieurs des fragments résultants ont frappé la Terre sous forme de météorites, une source importante de connaissances sur la composition de l'astéroïde7. Vesta est également l'astéroïde le plus brillant, suffisamment pour être discernable à l'œil nu à certains moments. La première mission spatiale dédiée à Vesta est la sonde Dawn de la NASA. Lancée le 17 septembre 2007, elle s'est placée en orbite autour de Vesta le 16 juillet 2011. Dawn, après la sonde Near-Shoemaker autour de l'astéroïde (433) Éros est la deuxième sonde spatiale à entrer en orbite autour d'un astéroïde et est la première à en repartir. Le samedi 16 juillet 2011 Dawn a transmis un signal à un laboratoire de la NASA situé à Pasadena en Californie, le Jet Propulsion Laboratory (JPL), confirmant qu'elle était dans l'orbite de Vesta, à environ 188 millions de kilomètres de la Terre. Depuis, la sonde s'est positionnée sur l'orbite qu'elle visait et s'est satellisée pour étudier de près sa cible.

Comments (12)


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goodoleboy

5:23PM | Wed, 12 July 2017

Fine light and shadow effects and depth in this rendering. And thanks for the information on these asteroid belt inhabitants.

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Cal83street

7:08PM | Wed, 12 July 2017

I like to learn new things about space. And your render gave me an idea on how huge this thing is. Great render and story.

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Faemike55

8:19PM | Wed, 12 July 2017

Too cool! Great image and information

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giulband

11:55PM | Wed, 12 July 2017

Thanks for the absolutely interesting description of this asteroid. We hope that he always remains in his orbit and he is not the foolish idea to visit us. At first glance, the image reminded me of those taken by the moon from the first astronauts. Impressive image.

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BryceHoro

1:46AM | Thu, 13 July 2017

Very well done space image featuring Vesta.

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DukeNukem2005

4:51AM | Thu, 13 July 2017

Very cool!

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jendellas

10:02AM | Thu, 13 July 2017

Wow, superb space scene. Great info.

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Leije

10:15AM | Thu, 13 July 2017

Belle image, et merci pour les infos en français !

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QuietRiot

12:23PM | Thu, 13 July 2017

Your presentations are always so informative....and always awesome!

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claude19

1:44PM | Thu, 13 July 2017

texte et image sont magnifiques !!! merci Magik !!!

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RodS

9:16PM | Thu, 13 July 2017

Really excellent space scene, Real! Fascinating info, and that's one big chunk of rock - I hope it stays safely within the asteroid belt.

I've downloaded a bunch of photos of Vesta and Ceres from NASA's site.

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Richardphotos

10:46PM | Fri, 14 July 2017

I like your spatial scenarios. educational


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