Observations from Japan’s Hayabusa2 spacecraft have astronomers questioning the true origin of the asteroid near Earth Ryugu.
of the Hayabusa2 mission launched in 2014, arrived at Ryugu in 2018 and return samples of asteroid thing i Earth to 2020. In addition to collecting these samples, the missionary collected important data about the cosmic body at a distance. While the types of rocks are being studied, distance models reveal three important features about Ryugu: his composition, nature and origin, according to the a word from Nagoya City University in Japan.
Observations show that far more than a single monolithic rock, Ryugu is a compact asteroid composed of small fragments of rock and solid particles joined by umekaumaha, researchers report a new study. Ryugu is described as a spinning wheel, perhaps because of his speed, as the saying goes.
Select: Why are asteroids and comets so different?
Finally, data shows that Ryugu has a very high organic content, showing that it did not emerge from the debris left over from the fusion between the two large asteroids, as in first thought. But Ryugu is probably the rest of the thing comet it has lost most of its ice, the researchers said in the study.
Comets are formed of ice, rocks and dirt left over from the formation of the Solar system about 4.6 billion years ago. They are based on outside, cold country of the solar system. However, as the comet travels through the solar system, it will become very hot as it approaches Earth. day, which directly converts solid ice into gas through a process called sublimation. This process leaves only rock debris, which is absorbed by gravity, and becomes asteroid debris.
“The sublimation of the ice causes the comet’s nucleus to expand and shrink, increasing the rate of transformation,” said lead author Hitoshi Miura, a source. counsel at Nagoya City University. “Because of this spin-up, the cometary nucleus can get the rotational speed necessary to build a spinning-top structure.
“Furthermore, the ice fragments of comets are thought to be in organisms formed in the central nervous system,” Miura said. “These creatures will be left on the rubbish that is left behind when the snow drops.”
Using a physical model, the researchers compared the length of time the Ryugu ice melts, and estimated the asteroid’s speed to increase. Their simulation suggested that Ryugu would be tens of thousands of years old as a powerful comet before moving to the inner solar system, where Ryugu’s ice melted, turning it into a a massive asteroid, as the saying goes.
A closer look at Ryugu’s examples will help confirm its origin. In other words, comet-asteroid transition objects (CATs) are called comet-asteroid transition objects (CATs). of the OSIRIS-REx missionwhich intends to return samples from an asteroid close to Earth known as Bennuto give further insight into these matters.
“There are a few CATs that have been made before but have gone unnoticed from asteroids,” Miura said in a statement. “Because of their similarity to comets and asteroids, CATs can provide new insights into our solar system.”
Their insights published Jan. 31 in Astrophysical Journal Letters.
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