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A newly found asteroid has been spotted orbiting the Sun, whizzing past the star every 151 days, the shortest orbit of any space rock on record.
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“Thirty years ago, people started organizing methodical asteroid searches, finding larger objects first, but now that most of them have been found, the bigger ones are rare birds,” says Quanzhi Ye, a postdoctoral scholar at Caltech who discovered 2019 LF6, in a statement.
(Credit: California Institute of Technology)
“LF6 is very unusual both in orbit and in size—its unique orbit explains why such a large asteroid eluded several decades of careful searches,” Ye added. “We only have about 20 to 30 minutes before sunrise or after sunset to find these asteroids.”
One other Atira asteroid has been discovered by the ZTF team, 2019 AQ3, which orbits the Sun approximately once every 165 days.
“Both of the large Atira asteroids that were found by ZTF orbit well outside the plane of the solar system,” NASA JPL research and Caltech professor Tom Prince said in the statement. “This suggests that sometime in the past they were flung out of the plane of the solar system because they came too close to Venus or Mercury.”
In its elliptical 151-day orbit, 2019 LF6 goes out past Venus and at certain points, comes closer to the Sun than Mercury does. By comparison, Mercury orbits the Sun every 88 days, Venus’ orbit takes 225 days and Earth orbits the Sun every 365 days.
2019 LF6 was discovered by the Zwicky Transient Facility, “a state-of-the-art camera” at the Palomar Observatory. It looks at the sky rapidly, searching for objects such as exploding stars or moving asteroids, which made it the perfect tool to look for the Atria asteroids.