‘It was a Real Challenge’: Arecibo Observatory Classifies Sneaky Asteroid from 2019
In July 2019, the asteroid 2019 OK came screaming out of the glare of the Sun where astronomers find it difficult to detect such small, faint objects, and passed within 45,000 miles of Earth while traveling at 5487 miles per hour. That's well inside the Moon's average orbit of around 238,000 miles. Despite the close call, 2019 OK didn't pose a threat to life on Earth, but asteroids like it one day could. That’s why scientists at the Arecibo radio astronomy observatory in Puerto Rico raced to make as many radar observations of the space rock as they could in the half hour or so it would remain in range of their antennas. They wanted to learn as much as possible about an asteroid that passed the Earth that closely and quickly. “It was a real challenge,” Luisa Fernanda Zambrano-Marin, a University of Central Florida planetary scientist who was at Arecibo in 2019, said in a statement. “No one saw it until it was practically passing by, so when we got the alert, we had very little time to act. Even so, we were able to capture a lot of valuable information.” That information is now published in a new paper in the Planetary Science Journal.
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