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Asteroid 3122 Florence, a 4.5 kilometer (2.8 mile) wide near-Earth object, made a close pass to Earth on September 01, 2017, treating researchers with the closest known approach to Earth of an asteroid of this size. Thankfully, unlike recent close brushes with substantially smaller rocks, Florence’s orbit brought it no closer to us than 7 million kilometers (4,350,000 miles), more than eighteen times farther out than the Moon’s orbit.
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Another asteroid made a close pass to the Earth, on January 24, at 11:54 EDT (5:54 UTC), the second one to do so in as many weeks. Asteroid 2017 BX’s close pass — just within the Moon’s orbit — follows asteroid 2017 AG13’s January 9 flyby by a mere 15 days. While this new asteroid missed us as well, and wouldn’t cause much damage if it were to actually to have hit us, it does set up a disturbing trend, as both 2017 BX and 2017 AG13 weren’t discovered until mere days before their closest approaches.
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A small asteroid passed extremely close to the Earth on January 9, missing us by only 192,500 kilometers (119,500 miles), roughly half the distance between the Earth and the Moon. Because of its small size, the asteroid, called 2017 AG13, wasn’t spotted until two days before its approach.
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NASA’s Jet Propulsion Laboratory has just announced that they have discovered an asteroid that will pass near the Earth on October 31. While it will zip by us at a safe distance, at approximately 280,000 miles (450,000km) away, just outside of the Moon’s orbit, the asteroid is troubling in that it was only detected on October 10, less than two weeks ago.
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