The haze is material sublimating from the nucleus. NASA Official:

It also has one of the slowest rotation periods of the known asteroids — most asteroids have a rotation period in the range of 2 – 24 hours. Il a une orbite relativement elliptique et met plus de quatre ans pour effectuer sa révolution autour du Soleil. Image Credit: NASA/JPL. Firsts. In the fall of 2022, NASA’s DART spacecraft will reach its destination: asteroid Didymos and its small moonlet Dimorphos. En 1880, Johann Palisa, alors directeur de l'observatoire naval autrichien, s'est vu offrir un poste d'assistant à l'observatoire de Vienne, récemment construit.

The next full Moon will be midday on Monday, August 3, 2020. Les impacts semblent avoir éjecté de gros volumes du corps parent hors de l'astéroïde, comme le suggèrent les bords angulaires des cratères[8]. The bright mountainous

It passed through the main asteroid belt between Mars and Jupiter, briefly observing Gaspara in 1991 and Ida in 1993. 253 Mathilde is a main-belt asteroid, in an eccentric orbit with a perihelion at 1.94 AU and aphelion at 3.35 AU. Mathilde is a C-type asteroid, which means that it is made of rock rich in carbon, and is probably very little changed in the last 4.5 billion years, a time capsule from the time the planets first formed. The name is thought to honor the wife of astronomer Moritz Loewy, then the vice director of the Paris Observatory. The figure below is an image of the asteroid Mathilde.

This image mosaic of asteroid 253 Mathilde is constructed from four images acquired by the NEAR spacecraft on June 27, 1997.

[10] The asteroid has a number of very big craters, with the individual craters being named for coal fields and basins around the world. "The degree to which the asteroid has been battered by collisions is astounding. It is probably very porous, somewhat like styrofoam. In Near Earth Asteroid Rendezvous Shoemaker …1,200 km (740 miles) of Mathilde, an asteroid in the main belt between Mars and Jupiter. All that carbon helps make Mathilde one of the darkest objects in the Solar System. Despite its darkness, the asteroid couldn't avoid its moment in the spotlight on June 27, 1997. 253 Mathilde is a main belt asteroid with a relatively small perihelion (1.94 AU) orbit: 394,000,000 km from the Sun (average) size: 59 x 47 km.

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[12] Because of the slow rotation rate, NEAR Shoemaker was only able to take pictures of 60% of the asteroid's surface. distance of 2,400 km (1,500 miles). Il a une orbite relativement elliptique et met plus de quatre ans pour effectuer sa révolution autour du Soleil.

This was taken from a distance of 2,400 km (1,500 miles). The low interior density is an inefficient transmitter of impact shock through the asteroid, which also helps to preserve the surface features to a high degree. The asteroid has a number of very big craters, with the individual craters being named for coal fields and basins around the world. How did it manage to be get such large craters without being completely shattered.

It is approximately 50 x 50 x 70 km in size. Science Writer: It is a primitive C-type asteroid, which means the surface has lots of carbon; giving it a dark surface that reflects only 4% of the light that falls on it.[9]. [4] The same is true of several C-type asteroids studied by ground-based telescopes with adaptive optics systems (45 Eugenia, 90 Antiope, 87 Sylvia and 121 Hermione). The surface exhibits many large …

Néanmoins, l'orbite se situe entièrement entre les orbites de Mars et de Jupiter ; il ne coupe pas les orbites planétaires.

Feb. 17, 1996: Launch June 27, 1997: Flyby of asteroid Mathilde Jan. 23, 1998: NEAR flew by Earth for a gravity assist Dec. 23, 1998: S pacecraft flew by Eros for the first time Feb. 14, 2000: NEAR entered orbit around Eros becoming the first human-made object to orbit an asteroid

The asteroid rotates very slowly, once every 418 hours (about 17.5 days). 253 Mathilde is very dark. In just a few weeks, OSIRIS-REx will descend to asteroid Bennu’s boulder-strewn surface to collect a sample. "The asteroid and Jupiter take the same amount of time to complete one orbit around the Sun, but one moves clockwise and the other counter-clockwise so … [13], [math]\begin{align} The angular shape of the upper left limb of the asteroid results & = 16.2\ \mbox{m/s} \\ Sunlight is coming from the upper right. Sunlight is coming from the upper right. They have experienced impacts and possibly fragmentation. This was taken from a It reflects only 4 percent of the light falling on it. \end{align}\!\,[/math]. This indicates that its interior is homogeneous, perhaps a pristine sample of the early solar system. OSIRIS-REx spacecraft will take a sample of asteroid Bennu on October 20.

The slow rate of rotation may been accounted for by a moon orbiting the asteroid, but a search of the NEAR images revealed none bigger than 10 km in diameter out to 20 times the radius of 253 Mathilde. Here are 10 things to know about Bennu.

Cet astéroïde a une durée de rotation anormalement lente, il met 17,4 jours pour réaliser une révolution de 360° autour de son axe. The most of the asteroids that have so far been encountered by spacecraft such as 433 Eros, 243 Ida and Gaspra are S-type asteroids; Mathilde is our first look at a C-type. As one scientist said, "It is blacker than coal" or two times the darkness of a chunk of charcoal.

The impacts appear to have blown big volumes off the asteroid, as suggested by the angular edges of the craters. the shadow. L'orbite de Mathilde est excentrique, l'objet se déplace jusqu'aux confins de la ceinture principale.

Il n'y a pas de différences de luminosité ou de couleur visibles dans les cratères et il n'y a aucun indice de stratification, de sorte que l'intérieur de l'astéroïde doit être très homogène. Unless otherwise noted, parameters are per: CS1 maint: multiple names: authors list (, "NEAR Encounter with Asteroid 253 Mathilde: Overview", "Estimating the mass of asteroid 253 Mathilde from tracking data during the NEAR flyby", "Categories for Naming Features on Planets and Satellites", "2.

It is currently the biggest asteroid to be visited by a spacecraft, and the first C-type asteroid to be so explored.

Il est également caractérisé par une des périodes de rotation des plus longues pour un astéroïde - la plupart des astéroïdes connus ont une période de rotation de l'ordre de 2-24 heures[16]. The Nine Planets has been online since 1994 and was one of the first multimedia websites that appeared on the World Wide Web. exhibits many large craters, including the deeply shadowed one at the center,

Parmi ses découvertes, on compte l'astéroïde (253) Mathilde, découvert le 12 novembre 1885.

En raison de la vitesse de rotation lente, la sonde NEAR Shoemaker n'a pu photographier que 60 % de la surface de l'astéroïde.

The angular shape is believed to result from a violent history of Cet astéroïde étant un objet majoritairement carboné, les cratères ont été nommés en référence à des bassins houillers terrestres célèbres. Voici la liste des cratères de Mathilde.

Cette approche étroite a permis à la sonde spatiale de capturer plus de 500 images de la surface[8], et a fourni des données qui ont permis de déterminer les dimensions et la masse de l'astéroïde de façon plus précise (en se basant sur la perturbation gravitationnelle de l'engin spatial)[4]. Details as small as 380 meters (1,250 feet) can be discerned.

NEAR

Les premiers éléments orbitaux de l'astéroïde ont ensuite été calculés par Auguste Victor Lebeuf, un astronome travaillant à l'observatoire de Paris. Site Manager: Certains scientifiques pensent que Mathilde a la consistance d'une pierre ponce et que les autres objets qui entouraient le Soleil à l'époque où il était encore jeune devaient avoir la même structure[15].

& = \sqrt{2 \cdot 0.0025\ \mbox{m/s}^2 \cdot 52800\ \mbox{m}} \\

The above picture of the previously unresolved asteroid was released just yesterday. [3] The impacts appear to have blown big volumes off the asteroid, as suggested by the angular edges of the craters. The spacecraft took pictures of one side of the asteroid, finding many big craters that have gouged out depressions in the surface. Cet astéroïde a été visité par la sonde spatiale NEAR Shoemaker au cours du mois de juin 1997, alors qu'il était en route vers l'astéroïde (433) Éros. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=253, "NEAR Encounter with Asteroid 253 Mathilde: Overview", http://adsabs.harvard.edu/abs/1999Icar..140....3V, "Estimating the mass of asteroid 253 Mathilde from tracking data during the NEAR flyby", http://www.sciencemag.org/cgi/content/full/278/5346/2106, http://adsabs.harvard.edu/abs/1995P&SS...43.1609M, http://nssdc.gsfc.nasa.gov/planetary/mission/near/near_mathilde.html, http://eetd.lbl.gov/HeatIsland/Pavements/Albedo/, "Categories for Naming Features on Planets and Satellites", http://planetarynames.wr.usgs.gov/append6.html#Asteroids, "2.

OSIRIS-REx unfurled its robotic arm, and in a first for NASA, briefly touched an asteroid to collect a sample. 253 Mathilde is an asteroid in the main belt between Mars and Jupiter, where it orbits the Sun once every 4.3 years. Amanda Barnett The part of the asteroid shown is about 59 by 47 km (36 by 29 miles) across. First human-made object to orbit an asteroid; First spacecraft to land on an asteroid; Key Dates.
"Mathilde turned out to be more irregularly shaped than most of us expected," said Dr. Joseph Veverka of Cornell University, who lead the mission's imaging science team. Sunlight is coming from the upper right. Mathilde's large craters and irregular shape indicates that it has undergone huge collisions with other large space rocks in the past. Perhaps this is somehow due to the many large impacts it obviously suffered.

This asteroid has an unusually slow rate of rotation, taking 17.4 days to complete a 360° revolution about its axis.

Another oddity is that Mathilde’s rotation rate is very slow, 17.4 days. The part of the asteroid shown is about 59 by 47 km (36 by 29 miles) across. Torrence V. Johnson, Paul R. Weissman, Lucy-Ann A. McFadden (2007). … On that day the Near Earth Asteroid Rendezvous (NEAR) spacecraft streaked past at a velocity of 22,000 mph (9.93 kilometers per second), passing within 746 miles (1,200 kilometers) of the surface. Content is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. V. A. Lebeuf, another Austrian astronomer, first calculated its orbit. Les deux plus grands cratères, Ishikari (29,3 km) et du Karoo (33,4 km), sont aussi larges que le rayon moyen de l'astéroïde[3]. Mathilde is a very unusual asteroid. Le 27 juin 1997, la sonde NEAR Shoemaker passa à 1212 km de (253) Mathilde en se déplaçant à une vitesse de 9,93 km/s.
The Near-Earth Asteroid Rendezvous (NEAR) spacecraft's flyby of asteroid Mathilde in 1997 found this type of structure and so did Japan's Hayabusa spacecraft when it visited asteroid Itokawa in 2005. La porosité du corps est élevée, jusqu'à 50 % du volume intérieur de (253) Mathilde se compose de vide.

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