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Hayabusa 2 (Хаябуса-2), Procyon – H-IIA F26 – Танэгасима – 03.12.2014 04:22:04 UTC, (успешно)
 
http://www.hayabusa2.jaxa.jp/en/topics/20180828e/index.html
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How the Star Tracker image of Ryugu was used for optical navigation

Notice: This is an English translation of the Japanese article on May 25, 2018.

Fr om May 11 - 14, asteroid Ryugu was imaged using the Star Tracker onboard Hayabusa2. This data was then used for the application of optical navigation towards the asteroid in this mission.

Around May 20, 2018, Hayabusa2 was about 287 million km fr om the Earth (see Figure 1) and about 40,000 km fr om Ryugu (Figure 2). The exact size of Ryugu is currently unknown, but the diameter is estimated to be around 900 m. This means that it is necessary to arrive at a target of 900 m fr om a distance of about 300 million km travelling from Earth. Such precision requires optical navigation. (For comparison, a 900 m target at a distance of 300 million km is the same as a 6 cm target at a distance of 20 thousand km. This is equivalent of aiming at a 6 cm target in Brazil from Japan.)
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Hayabusa2 Project
2018.08.28
 
http://www.hayabusa2.jaxa.jp/en/news/status/
Цитата
Aug. 29, 2018

★ Hayabusa2 status(the week of 2018.8.20)★

The spacecraft is currently operating in BOX-B. On August 23, we announced to the media that the point denoted “L08” near the asteroid equator had been selected as the candidate site for the touchdown of Hayabusa2. However, the surface of Ryugu is covered with boulders, so we need to continue gathering and considering information so that we can touchdown safely. The MINERVA-II-1 and MASCOT lander decided to land at mid-latitude sites, N6 and MA-9. MINERA-II-1 separation is scheduled for September 21, and MASCOT on October 3. We are looking forward to seeing what kind of data these will collect!

2018.8.28 S.N.
 
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JAXAウェブ‏Подлинная учетная запись @JAXA_jp 12 ч. назад

7月20・21日には、Box-C運用として高度約6kmまで降下したはやぶさ2。 その際ONC-T(望遠の光学航法カメラ)で撮影した小惑星リュウグウの画像を、 約30度おきに12枚掲載します。 はやぶさ2の着地候補地点の位置が、より理解しやすいかもしれません。

https://bit.ly/2N3L5Wd

#hayabusa2

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http://www.hayabusa2.jaxa.jp/topics/20180831/
(вольный) пер. с яп.
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Изображение Рюгю, сфотографированное в режиме Box-C

С 20 по 21 июля Сокол-2 спусткался примерно до 6 км над уровнем поверхности астероида во время режима Box-C. Здесь приведены некоторые из изображений, опубликованных ранее в статье от 25 июля и в статье от 31 июля. Кроме того, на приводимые изображения наложены области-кандидаты на касание и посадки.

Ниже размещены 12 снимков, сделанных в ONC-T (оптической навигационной камерой - телескопической) в режиме Box-C с интервалом примерно 30 °. Для справки также указываются элементы, описывающие положение области выбора места посадки в соответствии с общим снимком, приведённым на рисунке 1 ниже.


[Увеличенное изображение]
Рисунок 1 Позиции областей-кандидатов качания и приземления на фотографии поверхности Рюгю. Область, обозначенная как L08, является кандидатом на касание, а L07 и M04 - резервные. MA-9 - ожидаемая посадочная площадка MASCOT, N6 - планируемая зона посадки MINERVA-II-1. (© JAXA, Токийский университет, Университет Кочи, Университет Риккио, Университет Нагоя, Технологический институт Чибы, Университет Мэйдзи, Университет Айзу)

На приводимых ниже изображениях обратите внимание на их ориентацию. На рис.1 север Рюгю вверху. Это направление противоположно ранее показанным изображениям (статья 25 июля и статья 31 июля). Север Рюгю направлен к Антарктиде на Земле. Это связано с тем, что Рюгю вращается в противоположном направлении относительно Земли.


[Увеличить верхнее изображение]
[Увеличить нижнее изображение]
Изображение 1 Съемки сделаны 20 июля 2018 года 07:12 (UTC)
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Благодарности ※: JAXA, Токийский университет, Университет Кочи, Университет Риккио, Университет Нагоя, Технологический институт Чиба, Университет Мэйдзи, Университет Айзу

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Проект Hayabusa 2
2018.08.31
Изменено: tnt22 - 31.08.2018 22:59:31
 
Интересно практически полное отсутствие свежих ударных кратеров при огромном количестве камней и пыли.
 
JAXA, Кандидаты на посадочные площадки для миссии Hayabusa2 (JAXA, Candidates for landing sites for the Hayabusa2 mission) (на японском и английском языках) 23.08.2018 в pdf - 1,50 Мб
0. Hayabusa-2 и план текущей миссии
1. Статус проекта и общий график
2. Кандидаты на место и ожидаемые даты
3. Выбор кандидатур на приземление
4. Научные дискуссии для кандидатур на приземление
5. Выбор кандидатур на место посадки для MASCOT
6. Выбор кандидатур на место посадки для MINERVA-II
7. Стратегия успешного приземления
8. Планы на будущее
 
Цитата
Animation: Asteroidlander MASCOT on board Hayabusa2

DLR

Опубликовано: 16 мая 2018 г.

On 3 December 2014, the Japanese space probe Hayabusa2 embarked on a sample return mission to asteroid (162173) Ryugu (formerly designated 1999 JU3). On board is the Mobile Asteroid Surface Scout (MASCOT), a lander built by the German Aerospace Center (Deutsches Zentrum für Luft-und Raumfahrt; DLR) in collaboration with the French space agency CNES. The aim of the Hayabusa2 mission is to learn more about the origin and evolution of the Solar System. As asteroids account for some of the most primordial celestial bodies, researching them gives us a glimpse into our cosmic past. Furthermore, Ryugu is a near-Earth asteroid, which means it could pose a threat to Earth and must be investigated in order to reduce this threat.
https://www.youtube.com/watch?v=8H4aZX_8hMA (7:14)
 
Уже традиционный брифинг JAXA о текущем состоянии дел на астероиде Рюгю. Прямая трансляция JAXA 5 сентября с 11:00 до 12:00 (JST)
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02:00 - 03:00 UTC
05:00 - 06:00 ДМВ
 
http://www.hayabusa2.jaxa.jp/en/topics/20180904e/
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Determination of landing site candidates!

The Landing Site Selection (LSS) conference was held on August 17, 2018 and the candidate landing locations for touchdown, MASCOT and MINERVA-II-1 on the surface asteroid Ryugu were decided. In this article, we introduce the landing candidate spots and the planned dates for these surface operations, along with details of the selection.

Figure 1 is a map of asteroid Ryugu showing the landing candidate locations. Please note the direction of north and south on this map (Note).


Figure 1: Candidate landing sites.
Image credit for the map of Ryugu ※: JAXA, University of Tokyo, Kochi University, Rikkyo University, Nagoya University, Chiba Institute of Technology, Meiji University. University of Aizu, AIST.
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Hayabusa2 Project
2018.09.03

[Note] On the map shown in Figure 1, the north pole of the asteroid is on the top of the map. Public images released so far show the asteroid orientated in the opposite direction, with the direction of the Solar System’s north (and for the Earth’s North Pole) at the top. Geographical north and south of the asteroid is determined by rotation. As Ryugu rotates retrograde, in the opposite direction to the Earth and the Solar System, the asteroid’s northern direction is reversed with respect to the Solar System. The situation is the same for Itokawa. An image with the asteroid’s north at the top is therefore reversed compared to an image wh ere the Solar System north points upwards.
 
http://www.hayabusa2.jaxa.jp/en/news/status/
Цитата
Sep. 05, 2018

★ Hayabusa2 status(the week of 2018.8.27)★

Hayabusa2 has completed operation in BOX-B; observing the asteroid while moving laterally up to 9km while remaining at an altitude of about 20km. As the first rehearsal for touchdown is scheduled to start on 09/11, the spacecraft is now returning to the descent start position. In the first touchdown rehearsal, the spacecraft will descend to 30m or less from the asteroid surface to acquire a more detailed image of the primary touchdown candidate point, L08, and the surroundings. The distance to the asteroid will be measured for the first time using the LRF (Laser Range Finder); a short-distance laser sensor that is used for touchdown. This will be the first time the LRF has been used to measure distance since launch.

2018.09.04 F.T.
 
Была яп. версия статьи в русском вольном переводе.

Англ. официальный вариант

http://www.hayabusa2.jaxa.jp/en/topics/20180905e/
Цитата
Images of Ryugu captured during BOX-C operations

On July 20 – 21, 2018, the Hayabusa2 spacecraft descended to an altitude of about 6km as part of the BOX-C operation. We introduced a few of the images taken at this time in articles on July 25 and July 31. The articlediscussing the selection of the candidate landing sites also indicates the locations using BOX-C images.

In this post, we show 12 images taken with the ONC-T (Optical Navigation Camera – Telescopic) during the BOX-C operation at approximately 30 degree intervals. We show the original images and the images marked with the landing site candidates below, starting with the complete set of candidates in Figure 1.


[Enlarge image]
Figure 1: Candidate landing sites marked on the photograph of the surface of Ryugu. The area labelled L08 is the candidate touchdown site, with L07 and M04 as back-up locations. MA-9 is the anticipated landing area of MASCOT, while N6 is the scheduled landing area for MINERVA-II-1. (credit: JAXA, University of Tokyo, Kochi University, Rikkyo University, Nagoya University, Chiba Institute of Technology, Meiji University. University of Aizu, AIST.)
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Hayabusa2 Project
2018.09.05
 
https://spaceflightnow.com/2018/09/06/hayabusa-2-team-sets-dates-for-asteroid-landings/
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Hayabusa 2 team sets dates for asteroid landings
September 6, 2018 | Stephen Clark


Hayabusa 2’s optical navigation camera captured this view of asteroid Ryugu fr om a distance of 6 kilometers (4 miles) on July 20. Credit: JAXA

Japan’s Hayabusa 2 spacecraft is preparing to release three hopping robots to land on asteroid Ryugu in the coming month, with tiny instruments scientists hope will explore the airless world’s boulder-strewn landscape and return the first images from the surface of an asteroid.

Two of the landers developed by the Japanese space agency will be deployed together by Hayabusa 2 on Sept. 21, and another landing probe provided by German and French scientists is set for its descent to Ryugu on Oct. 3.

Those landing attempts will be preceded by a landing rehearsal using the Hayabusa 2 spacecraft to approach within 100 feet (30 meters) of Ryugu next week. The spacecraft is scheduled to reach its closest point to the asteroid Sept. 12, low enough to fire and test its laser range finder, a navigation sensor to be used on future touch-and-go maneuvers to snag a sample of Ryugu for return to Earth.

Next week’s practice descent will set the stage for a second rehearsal in mid-October

The close-up maneuvers around Ryugu come after more than two months of mapping surveys, revealing Ryugu’s appearance for the first time after Hayabusa 2’s arrival in late June.

The mission’s early reconnaissance of Ryugu allowed scientists to measure its size and mass. The asteroid has a slightly flattened shape, spanning around 1,640 feet (500 meters) in diameter along its equator and approximately 1,440 feet (440 meters) from pole-to-pole.

Ryugu makes one rotation every 7.63 hours and has a mass of roughly 450 million metric tons (496 million tons), yielding a calculation of the asteroid’s gravity.
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Сайт работ на Соколе-2 в реальном времени открыт теперь и на англ.яз.

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HAYABUSA2@JAXA‏ @haya2e_jaxa 4 ч. назад

Curious about what Hayabusa2 is doing right now? Our Haya2Now website is now in English! Just rollover each panel to find out more:

http://haya2now.jp/en.html

 
http://www.hayabusa2.jaxa.jp/en/topics/20180907e/
Цитата
Thermography of Ryugu by the TIR

We conducted observations of asteroid Ryugu using the Thermal Infrared Imager (TIR) onboard Hayabusa2. Figure 1 shows the thermographic image taken using the TIR at an altitude of 20 km (the home position) fr om Ryugu.


Figure 1: Asteroid Ryugu observed with the Thermal Infrared Imager (TIR). The images were captured between 16:02 – 23:45 JST on June 30, 2018 and were taken every eight minutes for one rotation. From the 20 km altitude (home position), one pixel is about 20 m in size. The distance to the Sun at this time is 0.987 au (1 au is about 1.496 billion km, the average annular distance between the Sun and the Earth). The scale bar shows relative temperature (the values have no meaning). Red indicates a high temperature while blue is for colder temperatures.
Image credit ※: JAXA, Ashikaga University, Rikkyo University, Chiba Institute of Technology, University of Aizu, Hokkaido University of Education, Hokkaido Kitami Hokuto High School, AIST, National Institute for Environmental Studies, University of Tokyo, German Aerospace Center (DLR), Max Planck Society for the Advancement of Science, Stirling University.


The image shows the temperature differences on Ryugu's surface during one rotation, with red indicating regions with a high temperature. Distinct regions at different temperatures are captured by the TIR. Features in a thermal image can be seen even if they are in a shaded location in the visible photograph. This lets us confirm that the overall shape of the asteroid is well understood, and also the characteristic topography such as craters and large boulders that show up as a difference in temperature.

A temperature difference can also be seen between the north and south hemispheres of the asteroid. At present, it is summer in the southern hemisphere (the upper part of the figure) and the temperature is higher in this region. In the northern hemisphere in the lower part of the figure, it is currently winter and colder. This difference is due to the inclination of the rotation axis, which results in different levels of radiation reaching the north and south. The TIR has therefore spotted that asteroids also undergo a “seasonal change”.

High temperatures on the asteroid reach 100°C, while the coldest regions sit at about room temperature. Temperatures also change depending on the solar distance of the asteroid, lowering as Ryugu moves further away from the Sun.

During the Hayabusa2 mission, we will investigate the formation process of asteroids by examining the characteristics of the surface material revealed by differences in surface temperature. From the TIR data, we can also look for scientifically important landing sites with millimeter-sized grains, and avoid landing Hayabusa2 in severe temperature environments or locations with obstacles such as boulders.

Reference: An article by Takehiko Arai, member of the TIR team, was posted on the Ashikaga University website (Japanese only).

※ Please use the displayed credit when reproducing these images. In the case wh ere an abbreviated form is necessary, please write “JAXA, Ashikaga University & collaborators".

Hayabusa2 project
2018.09.07
 
JAXA выпустило материалы брифинга 05.09.2018 на англ. яз.

Hayabusa2_Press20180905_E_verL2.pdf - 2.7 MB, 30 стр, 2018-09-10 06:58:43 UTC
 
 
 
 
 
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