Полет АМС Dawn к Весте и Церере

[Старый]

При взгляде на поверхность не покидает ощущение что это огромная толща пыли.

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Вся Веста в одной картинке

http://dawn.jpl.nasa.gov/multimedia/images/PIA14703_750_equi+CL.jpg

http://dawn.jpl.nasa.gov/multimedia/images/PIA14703_fig1_750_equi_ovl+CL.jpg

http://dawn.jpl.nasa.gov/multimedia/dawn_vesta_image_PIA14703.asp

Images Galleries > Vesta by Dawn
http://dawn.jpl.nasa.gov/multimedia/vesta_dawn_gallery.asp

[Oleg]

При взгляде на поверхность не покидает ощущение что это огромная толща пыли.

Надо ровер запускать... да, да...

[Parf]

Лёд уже нашли? Или одни силикаты?

Откуда там лёд? Вроде, Веста находится в зоне, где лёд испаряется. Разве что на полюсах есть "зоны вечной ночи"...

[instml]

Лёд уже нашли? Или одни силикаты?

Откуда там лёд? Вроде, Веста находится в зоне, где лёд испаряется. Разве что на полюсах есть "зоны вечной ночи"...

А на Меркурии уже нашли.

[sol]

Лёд уже нашли? Или одни силикаты?

Откуда там лёд? Вроде, Веста находится в зоне, где лёд испаряется. Разве что на полюсах есть "зоны вечной ночи"...

А на Меркурии уже нашли.

И на Земле...

[Parf]

Лёд уже нашли? Или одни силикаты?

Откуда там лёд? Вроде, Веста находится в зоне, где лёд испаряется. Разве что на полюсах есть "зоны вечной ночи"...

А на Меркурии уже нашли.

Ага, и на Луне. Но незначительные включения в грунте - это неинтересно. Интересны большие залежи льда там, куда не долетают солнечные лучи.

[Parf]

Обнаружена вторая по высоте гора в Солнечной системе

Так Веста имеет гравитационно равновесную сферическую форму? Иначе непонятно, как считать высоту гор.

Насчёт горных хребтов - тоже интересно. На Земле, насколько я помню, они образуются в результате встречного движения тектонических плит. А на Весте?

[instml]

Так Веста имеет гравитационно равновесную сферическую форму?

Таки нет. Сферическую форму даже Земля не имеет :wink:

Иначе непонятно, как считать высоту гор.

Но ведь считают же.

Насчёт горных хребтов - тоже интересно. На Земле, насколько я помню, они образуются в результате встречного движения тектонических плит. А на Весте?

А на Весте с плитами напряженка.

[instml]

Лёд уже нашли? Или одни силикаты?

Откуда там лёд? Вроде, Веста находится в зоне, где лёд испаряется. Разве что на полюсах есть "зоны вечной ночи"...

А на Меркурии уже нашли.

И на Земле...

Правда-правда?

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Mission Status
October 5, 2011

First Mapping Cycle Completed

Dawn's mapping of Vesta from an altitude of about 680 kilometers (420 miles) is going very smoothly. It has completed its first cycle of 10 orbits in which the principal objective was to acquire images looking straight down. Today the spacecraft will begin a new cycle of observing the surface at an angle to provide images scientists will use to create topographic maps and stereo images. This mapping strategy is described in more detail in the September 27, 2010 Dawn Journal.

Scientists and engineers are investigating increased noise in one of the gamma-ray sensors in the gamma-ray and neutron detector (GRaND).

http://dawn.jpl.nasa.gov/mission/status.asp

[Parf]

578 x 560 x 458 км. Таки не тянет Веста на карликовые планеты. Хотя гравитационная дифференциация вещества у неё, похоже, была, и жидкое ядро было.

И как при такой форме высоту гор измерять? Получается, она опоясана горным хребтом высотой 100 км.

[fon Butterfly]

578 x 560 x 458 км. Таки не тянет Веста на карликовые планеты. Хотя гравитационная дифференциация вещества у неё, похоже, была, и жидкое ядро было.

Похоже, что она была ± круглая, но пресловутый мега-импакт "попортил ей причёску"...

[Константин Дюкарев]

Список галереи vesta_dawn от NASA:
http://dawn.jpl.nasa.gov/multimedia/vesta_dawn_gallery.asp
http://dawn.jpl.nasa.gov/multimedia/vesta_dawn_gallery_2.asp
http://dawn.jpl.nasa.gov/multimedia/vesta_dawn_gallery_3.asp
http://dawn.jpl.nasa.gov/multimedia/vesta_dawn_gallery_4.asp

Но мне понравилось больше видео на

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Ray craters in Vesta's south polar region
October 8, 2011

This detail of a Dawn FC (framing camera) image shows many fresh craters, several with bright ejecta rays, which were formed by impacts into the floor of Vesta's south polar basin. The three most distinctive rayed craters are in the top and middle of the image and each has a clear raised crater rim.  Ejecta rays form when material is thrown out of a crater during an impact. These ejecta rays most commonly have a higher albedo (are brighter) than the surrounding surface, as is the case here. Sometimes larger masses of ejecta form small secondary craters near these ejecta rays. Even though this image resolves numerous small craters, only a few hundred meters across, higher resolution imagery is necessary to identify secondary craters in this case. The rayed craters also contain enigmatic low albedo dark material, which is seen across Vesta. The distinctive hummocky (eg. wavy/ undulating) terrane of Vesta's south polar region is evident throughout this image as well.

NASA's Dawn spacecraft obtained this image with its framing camera on September 9th 2011. This image was taken through the camera's clear filter. The distance to the surface is 1390km and the image resolution is about 130 meters per pixel.

http://dawn.jpl.nasa.gov/multimedia/imageoftheday/image.asp?date=20111008

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Fresh crater with dark and bright material
October 9, 2011

PASADENA, CALIF.--This detail of a Dawn FC (framing camera) image shows a fresh scarp rimmed crater with a remarkable distribution of bright and dark material in its interior. Most of this bright and dark material originates from the crater rim but some originates much farther down the inwardly dipping crater walls. Especially curious is the left hand side of the crater where a layer of dark material crops out about half way down the crater wall, below the bright material which crops out from the crater rim. The high resolution of this image also allows the pitted floor of this crater to become visible­­. Radial streaks of ejecta surround the crater and are superimposed on the older, densely cratered landscape. This landscape is identified as being older than the scarp rimmed crater because the craters it contains are older with less fresh, more eroded rims.

NASA's Dawn spacecraft obtained this image with its framing camera on October 2nd 2011. These images were taken through the camera's clear filter. The distance to the surface is 670km and the image resolution is about 63 meters per pixel.

http://dawn.jpl.nasa.gov/multimedia/imageoftheday/image.asp?date=20111009

[sol]

А где фотки льда?

[ronatu]

578 x 560 x 458 км. Таки не тянет Веста на карликовые планеты. Хотя гравитационная дифференциация вещества у неё, похоже, была, и жидкое ядро было.

И как при такой форме высоту гор измерять? Получается, она опоясана горным хребтом высотой 100 км.

Это просто бывший, поизносившийся куб.

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New View of Vesta Mountain From NASA's Dawn Mission



http://www.nasa.gov/mission_pages/dawn/multimedia/pia14869.html

A new image from NASA's Dawn spacecraft shows a mountain three times as high as Mt. Everest, amidst the topography in the south polar region of the giant asteroid Vesta.

The peak of Vesta's south pole mountain, seen in the center of the image, rises about 13 miles (22 kilometers) above the average height of the surrounding terrain. Another impressive structure is a large scarp, a cliff with a steep slope, on the right side of this image. The scarp bounds part of the south polar depression, and the Dawn team's scientists believe features around its base are probably the result of landslides.

The image is online at: http://www.nasa.gov/mission_pages/dawn/multimedia/pia14869.html . It was created from a shape model of Vesta, and shows an oblique perspective view of the topography of the south polar region. The image resolution is about 300 meters per pixel, and the vertical scale is 1.5 times that of the horizontal scale.

Dawn entered orbit around Vesta in July. Members of the mission team will discuss what the spacecraft has seen so far during a news conference at the Annual Meeting of the Geological Society of America in Minneapolis. Among other things, they'll share their hypotheses on the origins of Vesta's curious craters.

The meeting, at the Minneapolis Convention Center, runs from Oct. 9 to 12, with the Dawn news conference scheduled for Wednesday, Oct. 12, at 10 a.m. PDT (noon CDT).

The event will air live on the Geological Society of America webcast page at:
http://hosted.mediasite.com/mediasite/Viewer/?peid=e8adbee5a37e455fbe199b29129e3b7c1d . Media representatives not able to attend the meeting may participate by registering at: http://rock.geosociety.org/forms/11_pressConf.asp . More information about the webcast is at:
http://www.geosociety.org/news/pr/11-63.html .

The event will also be carried live, with a moderated chat, at: http://www.ustream.tv/nasajpl2 .

The news conference panelists are:

Carol Raymond, Dawn deputy principal investigator, NASA's Jet Propulsion Laboratory, Pasadena, Calif.
Paul Schenk, Dawn participating scientist, Lunar and Planetary Institute, Houston
Debra Buczkowski, Dawn participating scientist, Applied Physics Laboratory, Johns Hopkins University, Laurel, Md.
Federico Tosi, Dawn Visible and Infrared Spectrometer team member, Italian Space Agency, Rome

Following a year at Vesta, the spacecraft will depart in July 2012 for Ceres, where it will arrive in 2015. Dawn's mission to Vesta and Ceres is managed by the Jet Propulsion Laboratory, Pasadena, Calif., for NASA's Science Mission Directorate in Washington. JPL is a division of the California Institute of Technology in Pasadena. Dawn is a project of the directorate's Discovery Program, managed by NASA's Marshall Space Flight Center in Huntsville, Ala. UCLA is responsible for overall Dawn mission science. Orbital Sciences Corp. in Dulles, Va., designed and built the spacecraft. The German Aerospace Center, the Max Planck Institute for Solar System Research, the Italian Space Agency and the Italian National Astrophysical Institute are international partners on the mission team.

More information about the Dawn mission is at: http://www.nasa.gov/dawn and http://dawn.jpl.nasa.gov . To follow the mission on Twitter, visit: http://www.twitter.com/NASA_Dawn .

http://www.jpl.nasa.gov/news/news.cfm?release=2011-317&cid=release_2011-317

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NASA's Dawn Science Team Presents Early Science Results

Scientists with NASA's Dawn mission are sharing with other scientists and the public their early information about the southern hemisphere of the giant asteroid Vesta. The findings were presented today at the annual meeting of the Geological Society of America in Minneapolis, Minn.

Dawn, which has been orbiting Vesta since mid-July, has found that the asteroid's southern hemisphere boasts one of the largest mountains in the solar system. Other findings show that Vesta's surface, viewed by Dawn at different wavelengths, has striking diversity in its composition, particularly around craters. Science findings also include an in-depth analysis of a set of equatorial troughs on Vesta and a closer look at the object's intriguing craters. The surface appears to be much rougher than most asteroids in the main asteroid belt. In addition, preliminary dates from a method that uses the number of craters indicate that areas in the southern hemisphere are as young as 1 billion to 2 billion years old, much younger than areas in the north.

Scientists do not yet understand how all the features on Vesta's surface formed, but they did announce today, after analysis of northern and southern troughs, that results are consistent with models of fracture formation due to giant impact.

Since July, the Dawn spacecraft has been spiraling closer and closer to Vesta, moving in to get better and better views of the surface. In early August, the spacecraft reached an orbital altitude of 1,700 miles (2,700 kilometers) and mapped most of the sunlit surface, during survey orbit, with its framing camera and visible and infrared mapping spectrometer.

That phase was completed in late August, and the spacecraft began moving in to what is known as High Altitude Mapping Orbit at about 420 miles (680 kilometers) above Vesta, which it reached on Sept. 29.

An archive of the live news conference is available for viewing at: http://www.ustream.tv/nasajpl2 .

The Dawn scientists also shared their findings at the recent European Planetary Science Congress and the Division of Planetary Sciences Joint Meeting 2011 in Nantes, France.

Dawn launched in September 2007 and arrived at Vesta on July 15, 2011. Following a year at Vesta, the spacecraft will depart in July 2012 for the dwarf planet Ceres, where it will arrive in 2015.

Dawn's mission to Vesta and Ceres is managed by the Jet Propulsion Laboratory, Pasadena, Calif., for NASA's Science Mission Directorate in Washington. JPL is a division of the California Institute of Technology in Pasadena. Dawn is a project of the directorate's Discovery Program, managed by NASA's Marshall Space Flight Center in Huntsville, Ala. UCLA is responsible for overall Dawn mission science. Orbital Sciences Corp. in Dulles, Va., designed and built the spacecraft. The German Aerospace Center, the Max Planck Institute for Solar System Research, the Italian Space Agency and the Italian National Astrophysical Institute are international partners on the mission team.

For more information about the Dawn mission, visit: http://www.nasa.gov/dawn and http://dawn.jpl.nasa.gov . To follow the mission on Twitter, visit: http://www.twitter.com/NASA_Dawn .

http://www.jpl.nasa.gov/news/news.cfm?release=2011-319&cid=release_2011-319