Asteroid 2017 SS12 flew past Earth at 0.67 LD, one day before discovery


A newly discovered asteroid designated 2017 SS12 flew past Earth at 0.67 LD (~ 257 280 km / 159 866 miles) at 15:33 UTC on September 24, 2017, one day before it was discovered. This is the 33rd known asteroid to flyby Earth within 1 lunar distance since the start of the year.

2017 SS12 belongs to the Apollo group of asteroids. Its estimated size is between 7 and 24 m (22 and 78 feet).

It was first observed at Catalina Sky Survey on September 25, one day after its closest approach.

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]

The last time any known asteroid flew past Earth within 1 lunar distance was on September 20. On that day, three of them flew past us (2017 SM22017 SR2, and 2017 SZ32) within 13 hours.


Asteroid 2017 SS12 at Minor Planet Center; at CNEOS

Featured image: The green line indicates the object's apparent motion relative to the Earth, and the bright green marks are the object's location at approximately one-hour intervals. The Moon's orbit is gray. The blue arrow points in the direction of Earth's motion and the yellow arrow points toward the Sun. Credit: Minor Planet Center


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