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Asteroid 2018 CS1 flew past Earth at 0.90 LD, 3 days before discovery

asteroid-2018-cs1

A newly discovered asteroid designated 2018 CS1 flew past Earth at a distance of 0.90 LD / 0.00230 (~ 344 075 km / 213 798 miles) on February 4, 2018, 3 days before it was first observed. A total of 13 known asteroids flew past us within 1 lunar distance since the start of the year and five since the start of the month.

Asteroid 2018 CS1 belongs to the Apollo group of asteroids. It was first observed at Catalina Sky Survey on February 7, 2018.

This asteroid has an estimated diameter of 6.1 – 14 m (20 – 46 feet) and it flew past us at 14:50 UTC on February 4 at a speed (relative to the Earth) of 8.78 km/s.

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

The list of all known less than 1 lunar distance asteroid flybys since the start of the year (valid 15:00 UTC, February 11):

List of all known less than 1 lunar distance asteroid flybys since the start of the year, valid 15:00 UTC, February 11

Data provided by CNEOS. Click here for a larger image.

Orbit diagram animations can be found here.

Reference:

Asteroid 2018 CS1 at Minor Planet Center; at CNEOS

Featured image: 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 grey. 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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