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天文学家发现一颗大而罕见的小行星 近日点和远日点均在地球轨道以内

According to foreign media CNET, astronomers have discovered an unusual asteroid, the asteroid that has the shortest revolution period. The asteroid with the number "2019 LF6" has a revolution period of only 151 days. The asteroid rotates in a very unusual elliptical orbit, sometimes closer to the sun than Mercury at one end, and then passes through Venus at the other end.

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This makes this asteroid one of the 20 so-called "Atira" asteroids known, with its perihelion and astronomical points within Earth's orbit. But the "2019 LF6" asteroid is rare because it is relatively large and is about a kilometer in diameter.

“There are often no asteroids about 1 km in diameter recently,” said Calzhi, an asteroid discoverer at the California Institute of Technology, in a statement. "In most of the larger (larger celestial bodies) that have been discovered, this larger celestial body is rare. its unique orbit explains why such a large asteroid has been carefully searched for decades. Not observed in the middle."

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Astronomers discovered the asteroid using the Zwicky Transient Facility at the Palomar Observatory, which also discovered another Atira asteroid earlier this year. Tom Prince, a scientist at the NASA Jet Propulsion Laboratory, said: "This shows that in the past they were sometimes thrown out of the solar system because they are too close to Venus or Mercury."

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