Japanese scientists say they’ve figured out where Ryugu asteroid is from

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Japan’s Hayabusa2 spacecraft has been hanging around the asteroid known as Ryugu for several months now. It first arrived in late 2018 and, in February, fired a projectile into its surface to collect a sample from the rock. It still has plenty of work to do but things are moving along nicely.

Now, after learning more about the asteroid itself, Japanese scientists believe they know where the object originated, narrowing down its possible asteroid “parents” to a pair of larger rocks. Conclusively determining Ryugu’s origins won’t be easy, but the color of the asteroid has helped researchers narrow things down quite a bit.

In a new research paper published in Science, an international team of scientists describes a variety of characteristics they’ve been able to observe thanks to images from Hayabusa2.

They’ve been able to determine the parent body of Ryugu had at least some water ice on its surface and possibly “organic molecules” as well.

Enlarge ImageThe surface of Ryugu has unusually low albedo, or reflectance, of 2 percent, so to our eyes it is blacker than coal.
The surface of Ryugu has unusually low albedo, or reflectance, of 2 percent, so to our eyes it is blacker than coal.© 2019 Seiji Sugita et al., Science
Ryugu is incredibly dark by any standard and it’s thought to be one of the darkest objects in our entire solar system. That might be hard to believe when you see images shot by Hayabusa2 but it’s important to remember that the tools the probe is equipped with were designed specifically to capture the detail of the rock’s dark surface.

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