2018 CB

On 9 February 2018, the asteroid passed about 64,500 km (40,100 mi) from Earth, traveling 10 miles per second (16 km/s) relative to Earth and briefly reaching apparent magnitude 13.^[4][5] It was observed by the Goldstone Observatory, which constrained its size to no more than 20 meters.^[3]

During the flyby its period was changed from 1.48 years to 1.67 years.^[2]

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  Its path across the sky on February 9 was north to south (30 minute positions shown)
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  Seen from space, it passes just outside geosynchronous orbit
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  20 minute timelapse, taken two days before closest approach. The asteroid can be seen near the center of the image, moving towards the lower left. Brightness is inverted (stars appear dark, the sky background appears light).^[6]
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  2018 CB on February 7. The image is corrected for the asteroid's motion, so stars appear trailed.^[7]

2018 CB's orbit is in Earth's neighborhood, so it frequently makes other close approaches to Earth like the 2018 one, although not usually as close. In 1953 (65 years or 44 orbits earlier), it passed 0.00650 AU (972,000 km; 604,000 mi) from Earth, and in 2090 it will pass between 0.00475 AU (711,000 km; 442,000 mi) and 0.00798 AU (1,194,000 km; 742,000 mi) from Earth.^{[citation needed]}

It also may have passed similarly near Earth in 1914, but the uncertainty in the 1953 approach makes it difficult to determine.^{[citation needed]}

2018 CB appears unusually bright for its size, suggesting it is made of brighter materials than the average asteroid.