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Update: Japanese probe lands third hopping rover on asteroid

Scott Sutherland
Meteorologist/Science Writer

Friday, October 5, 2018, 10:30 AM - For the first time ever, we have video footage from the surface of an asteroid flying through space, thanks to Japan's Hayabusa 2 spacecraft and its tiny hopping rovers, and this is just the beginning as these robots investigate the potential origin of life in our solar system.

This story has been updated.

Space has been fairly busy over the past few weeks. NASA's Transiting Exoplanet Survey Satellite (TESS) is already finding alien planet candidates, in its very first images. The Juno spacecraft made another close pass over Jupiter. The Parker Solar Probe just entered Venus' gravitational influence, which will propel the spacecraft on its first pass around the Sun in November. Astronomers have locked down the origin point of interstellar comet 'Oumuamua to one of four possible star systems. A Mars orbiter even captured a picture of NASA's venerable (and still silent) Opportunity rover, as the robot's team of handlers, back here on Earth, still waits to hear from it.

Possibly the most remarkable of all, though, is a simple time-lapse video, composed of just 15 frames, shot in sequence over a period of an hour and 14 minutes.

The reason?

This is the very first video shot from the surface of an asteroid.

Captured by the Japan Aerospace Exploration Agency (JAXA) Rover-1B - one half of the MINERVA-II1 pair of rovers that set down on the asteroid's surface on September 21 - after the robot performed a successful 'hop' maneuver, the video shows how the shadows change on the surface, as the asteroid rotates through part of its 7.6 hour 'day'.

Rover-1B, along with its partner, Rover-1A, have sent back other photos as well, as they demonstrated their capabilities to the mission team.

Hayabusa 2 mission image captured immediately before hop of Rover-1B, at 9:46 JST on Sept 23, 2018. Credit: JAXA

Hayabusa 2 surface image from Rover-1B after landing. Credit: JAXA

Hayabusa 2 surface image taken from Rover-1A, at 9:43 JST, Sept 23, 2018. Credit: JAXA

The asteroid in question is 162173 Ryugu, a half-billion ton, roughly 1-km wide rock, flying through space on an elliptical orbit that periodically has it making a 'close pass' by Earth, coming to within about 10-20 million kilometres of the planet.

While its size, and distance at these close passes, earns it the label of a "potentially hazardous asteroid", there is no direct danger from asteroid Ryugu.

The real interest in Ryugu is what this object can tell us about the development of our solar system, and what clues it may hold for the possible origin of life on Earth.

Watch below as JAXA and German Aerospace Center (DLR) scientists explain the details of the Hayabusa 2 mission (be sure to turn on closed captions):

Coming up next, in addition to more hopping and more images by Rover-1A and 1B, Hayabusa 2 will be deploying MASCOT - The Mobile Asteroid Surface Scout, developed by the DLR and France's National Centre for Space Studies (CNES) - in the first week of October.

MASCOT, a larger rover with more sensors, is expected to use up its 16 hours of battery life gathering as much data as it can about the asteroid's surface structure and mineral composition, as well as its magnetic and thermal properties.

Update 1 (Thursday, October 4): MASCOT safely landed on Asteroid Ryugu on October 3, 2018, and began collecting data from its instruments.

Remarkably, the tiny rover actually outlasted its expected battery life, performing science for over 17 hours, executing two hops, and sending back all of its data to Hayabusa 2, for transmission back to Earth!

Update 2 (Friday, October 5): More pictures of MASCOT descending to the surface of Ryugu!

This sequence shows MASCOT photographed by the ONC-W2 immediately after separation. MASCOT was captured on three consecutively shot images, making a short animated movie. The image capture time is between 10:57:54 JST – 10:58:14 JST on October 3. Since separation time itself was at 10:57:20 JST, these images were captured immediately after separation. The ONC-W2 is a camera attached to the side of the spacecraft and is shooting diagonally downward from Hayabusa2. This gives an image showing MASCOT descending with the surface of Ryugu in the background. MASCOT is especially clear in the third image. Credit: JAXA, University of Tokyo, Kochi University, Rikkyo University, Nagoya University, Chiba Institute of Technology, Meiji University, University of Aizu, AIST.

These maps of asteroid Ryugu, composed of shots taken by the Hayabusa 2 spacecraft's cameras, show the approximate location of where MASCOT landed. Left image is a projection map, showing the entire surface of the asteroid as a 2-d image. Right image is Ryugu, as it looks in reality, from Hayabusa 2's 'home position'. Credit: JAXA, University of Tokyo, Kochi University, Rikkyo University, Nagoya University, Chiba Institute of Technology, Meiji University, University of Aizu, AIST.

Stand by for more results coming in!

Source: JAXA


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