Hayabusa2 Asteroid Sample Return Capsule to Land in Australia on Dec. 6

Schematic diagram of the Earth return orbit for Hayabusa2 and operations. (Credit: JAXA)

TOKYO (JAXA PR) — Dr. Hiroshi Yamakawa, President, the Japan Aerospace Exploration Agency (JAXA) and Dr. Megan Clark AC, Head, the Australian Space Agency (the Agency) released a joint statement dated July 14 2020. The statement acknowledges that the capsule of ‘Hayabusa2’ containing the asteroid samples will land in South Australia on December 6, 2020.


Queen’s Brian May Works to Probe Origin of Asteroids

Brian May (Credit: ESA)

NICE, France (ESA PR) — Queen guitarist and astrophysicist Brian May has teamed up with asteroid researchers to investigate striking similarities and a puzzling difference between separate bodies explored by space probes. The research team ran a supercomputer-based ‘fight club’ involving simulated large asteroid collisions to probe the objects’ likely origins. Their work is reported in Nature Communications.  


A Sunburned Ryugu: Asteroid Surface Weathered by the Sun

Artificial crater on asteroid Ryugu (Credit: JAXA, University of Tokyo, Kochi University, Rikkyo University, Nagoya University, Chiba Institute of Technology, Meiji University, University of Aizu, AIST)

TOKYO (JAXA PR) — New information about the surface and orbit of Ryugu has been uncovered from analyzing data obtained during touchdown and the global observations performed by the asteroid explorer, Hayabusa2. These findings have been published in the electronic version of the US scientific journal Science, on May 7, 2020 (May 8, JST: Morota et al, 2002). The paper was led by Associate Professor Tomokatsu Morota from the University of Tokyo and member of the Hayabusa2 science team.


Hayabusa2 Fires Ion Engine During Trip Home

In December 2020, the Japanese Hayabusa2 spacecraft will return to Earth and, before entering the Earth’s atmosphere (during which it will burn up), will release a sealed capsule containing samples from two different locations on asteroid Ryugu, which, slowed down by the Earth’s atmosphere and a parachute, will land in Australia. (Credit: DLR)

TOKYO (JAXA PR) — The 2nd ion engine operation has begun. This is an important operation in the return journey of Hayabusa2 back to Earth. On May 12, 2020, the ion engine ignited at 07:00 (onboard time, JST) and was confirmed to be operating stably at 07:25 (ground time, JST).

Currently, only a single ion engine is operating as the spacecraft is far from the Sun, and receives a low level of solar power with which to operate the ion engines.

Schematic diagram of the Earth return orbit for Hayabusa2 and operations. (Credit: JAXA)

The 2nd ion engine operation will continue until around September this year. At the end of the operation, the spacecraft will be in an orbit that can deliver the capsule to Earth. After that—from October this year—we will perform precision guidance using the chemical thrusters (figure 1).

It is now only a short time before we return to Earth.

Asteroid Ryugu Likely Link in Planetary Formation

Formation scenario for Ryugu. More than one year ago, the Japanese Hayabusa2 orbiter deployed the German lander, MASCOT, which investigated the approximately one-kilometre-diameter asteroid Ryugu. Scientists are now imagining the history of its formation 4.5 billion years ago. First, flakes and grains of dust formed in the disc of dust and gas rotating around the Sun (1), before porous planetesimals agglomerated due to the accretion of these loose flakes (2). Recent investigations suggest that Ryugu’s parent body hardly condensed and was also highly porous. This may have resulted in the formation of a firmer core, but scientists also believe that a gradual increase in density towards the centre of the parent body is conceivable (3). Impacts and collisions with other asteroids (4) led to a fragmentation of the parent body; the large boulders on Ryugu probably originated here. Part of the debris was then the source material for the accretion of Ryugu (5), with porous blocks and loose material, and also some more compact blocks of higher density from the original core, some of which remain on the surface. Ryugu‘s present diamondlike shape (6) occurred over time due to its rotation. (Credit: Okada et al. Nature 2020)
  • Infrared images show that Ryugu is almost entirely made up.
  • The asteroid was formed largely from fragments of a parent body that was shattered by impacts of highly porous material.
  • DLR scientists participate in the publication in the scientific journal Nature.

COLOGNE, Germany (DLR PR) — The Solar System formed approximately 4.5 billion years ago. Numerous fragments that bear witness to this early era orbit the Sun as asteroids. Around three-quarters of these are carbon-rich C-type asteroids, such as 162173 Ryugu, which was the target of the Japanese Hayabusa2 mission in 2018 and 2019. The spacecraft is currently on its return flight to Earth.

Numerous scientists, including planetary researchers from the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR), intensively studied this cosmic ‘rubble pile’, which is almost one kilometre in diameter and can come close to Earth. Infrared images acquired by Hayabusa2 have now been published in the scientific journal Nature. They show that the asteroid consists almost entirely of highly porous material.


JAXA Eyes Phobos Landing, Sample Return

Martian moon Phobos

The Asahi Shimbun reports on a proposal for a sample return mission to Mars’ moon Phobos.

JAXA officials submitted a plan to the science ministry on Feb. 19 that calls for the probe to attempt a landing on Phobos to collect rocks and sand.

The probe will use similar technology installed on the Hayabusa 2 probe, which allowed JAXA to collect and retrieve samples from the asteroid Ryugu in 2019.

Hayabusa 2 is scheduled to release a capsule containing those samples above Australia at the end of this year.

A new H-3 rocket will be used to launch the exploration plan dubbed MMX in September 2024.

Ryugu Impact Crater Data Analysis Illuminates Complicated Geological History

Figure 1: Size and location of craters on Ryugu (Figure from the Journal paper): The craters are numbered in order of size.

KOBE, Japan (Kobe University PR) — Analysis of the impact craters on Ryugu using the spacecraft Hayabusa 2’s remote sensing image data has illuminated the geological history of the Near-Earth asteroid.

A research group led by Assistant Professor Naoyuki Hirata of the Department of Planetology at Kobe University’s Graduate School of Science revealed 77 craters on Ryugu. Through analyzing the location patterns and characteristics of the craters, they determined that the asteroid’s eastern and western hemispheres were formed at different periods of time.


First Detection of Sugars in Meteorites Gives Clues to Origin of Life

This mosaic image of asteroid Bennu is composed of 12 PolyCam images collected on Dec. 2, 2018, by the OSIRIS-REx spacecraft from a range of 15 miles (24 km). (Credits: NASA/University of Arizona)

GREENBELT, Md. (NASA PR) — An international team has found sugars essential to life in meteorites. The new discovery adds to the growing list of biologically important compounds that have been found in meteorites, supporting the hypothesis that chemical reactions in asteroids – the parent bodies of many meteorites – can make some of life’s ingredients. If correct, meteorite bombardment on ancient Earth may have assisted the origin of life with a supply of life’s building blocks.


Hayabusa2 Releases Target Markers in Advance to Another Rover Landing

The target markers are in preparation for the landing of the MINERVA-II2 Rover-2 on the surface of asteroid Ryugu in October.

Hayabusa2 Packs Up Soil Samples for Return to Earth

Artificial crater created by Hayabusa 2 on asteroid Ryugu (Credit: JAXA, University of Tokyo, Kochi University, Rikkyo University, Nagoya University, Chiba Institute of Technology, Meiji University, University of Aizu, AIST)

by Douglas Messier
Managing Editor

Japan’s Hayabusa2 spacecraft is not scheduled to return its precious cargo of soil samples of asteroid Ryugu to Earth for 16 more months, but it has already begun to pack up for home.

“In an operation today (August 26), the sample catcher was stored in the re-entry capsule (see figure). The sampler and capsule teams gathered to watch and the operation was completed successfully. The capsule is now ready for Earth return!” JAXA tweeted.


The Near-Earth Asteroid Ryugu – a Fragile Cosmic ‘Rubble Pile’

  • The asteroid is similar to carbonaceous, 4.5 billion year old meteorites found in collections on Earth.
  • Ryugu has numerous cavities.

COLOGNE, Germany (DLR PR) — In the summer of 2018, the asteroid Ryugu, which measures only approximately 850 metres across, was visited by the Japanese Hayabusa2 spacecraft. On board was the 10-kilogram German-French Mobile Asteroid Surface Scout (MASCOT) – a lander no bigger than a microwave oven and equipped with four instruments.


JAXA Names Artificial Crater and Boulders on Asteroid Ryugu

Artificial crater on asteroid Ryugu with names. (Credit: JAXA, University of Tokyo, Kochi University, Rikkyo University, Nagoya University, Chiba Institute of Technology, Meiji University, University of Aizu, AIST)

TOKYO (JAXA PR) — The following nicknames are being used for the area around the artificial crater:

  • Artificial crater: Omusubi-Kororin crater (SCI crater)
  • Moved rock: Iijima boulder
  • Immobile rock: Okamoto boulder
  • Large boulder: Onigiri boulder

Omusubi-Kororin crater (SCI crater)

From the folktale of the “rolling rice ball”. This was chosen as the boulders in this vicinity are shaped like Japanese rice balls and may roll down into the crater. The crater will also continue to be referred to as the “SCI crater”, depending on the situation.

Iijima boulder

In memory of Yuichi Iijima. Dr Iijima worked to gain the cooperation from universities outside JAXA during the start-up of the Hayabusa2 Project and so laid the foundation for Project’s success. In particular, in order to maximise the scientific results from the impact experiment, he worked hard across different fields and focussed on the proposal and development for the digital deployable camera for scientific observation (DCAM3). Dr Iijima passed away on December 7, 2012.

Okamoto boulder

In memory of Chisato Okamoto. Dr Okamoto was one of the core members of the Hayabusa2 sampler development team and energetically repeated laboratory experiments in preparation for collecting samples on Ryugu. She was also a member of the impact experiment team and played a central role in the simulation of the asteroid surface conditions used for the impact experiment in Kamioka. Dr Okamoto passed away on July 25, 2018.

Onigiri boulder

An onigiri is a Japanese rice ball (sometimes the shape is triangular) and resembles this boulder. (Both omusubi and onigiri mean rice ball.)

Return and Recovery Plan for Hayabusa2 Sample Return Capsule

Hayabusa-2 spacecraft (Credit: Akihiro Ikeshita / JAXA)

TOKYO (JAXA PR) — This report concerns the current status of the return and recovery plan of the Hayabusa2 sample return capsule.

At the end of 2020, Hayabusa2 plans to return to the Earth with the samples collected from asteroid Ryugu. As with the recovery of the first Hayabusa in 2010, JAXA is currently working with the Australian Government to support the recovery of the Hayabusa2 re-entry capsule in 2020 at the Woomera Prohibited Area (WPA) located in the outback desert of South Australia.


Australia Set to Welcome JAXA’s Hayabusa2 Return Capsule

Figure 2: Touchdown image overlapped with the planned touchdown site. The white dot at the end of the arrow is the target marker. (Credit: JAXA, University of Tokyo, Kochi University, Rikkyo University, Nagoya University, Chiba Institute of Technology, Meiji University, University of Aizu, AIST)

CANBERRA (Australian Space Agency PR — To learn more about the solar system’s origin and evolution, the Japan Aerospace Exploration Agency (JAXA) is investigating typical types of asteroids. Analysing samples from asteroids enables us to study organic matter and water in the solar system.