Asteroid 2018 XA4 flew past Earth at 0.97 LD


A newly discovered asteroid designated 2018 XA4 flew past Earth at a distance of 0.97 LD / 0.00248 AU (371 002​ km / 230 530 miles) on December 11, 2018. This is 73rd known asteroid to flyby Earth within 1 lunar distance since the start of the year. 

This object belongs to the Apollo group of asteroids. It was first observed at Mt. Lemmon Survey, Arizona on December 13, 2 days after its close approach to our planet.

2018 XA3 has an estimated diameter between 4.1 and 9.2 m (13 and 30 feet) and it flew past us at a speed (relative to the Earth) of 12.77 km/s at 15:42 UTC.

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

This is the second known <1LD flyby since December 2 and 73rd since the start of the year and the second this month. 


Asteroid 2018 XA4 at Minor Planet Center; 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 half 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


Commenting rules and guidelines

We value the thoughts and opinions of our readers and welcome healthy discussions on our website. In order to maintain a respectful and positive community, we ask that all commenters follow these rules:

  • Treat others with kindness and respect.
  • Stay on topic and contribute to the conversation in a meaningful way.
  • Do not use abusive or hateful language.
  • Do not spam or promote unrelated products or services.
  • Do not post any personal information or content that is illegal, obscene, or otherwise inappropriate.

We reserve the right to remove any comments that violate these rules. By commenting on our website, you agree to abide by these guidelines. Thank you for helping to create a positive and welcoming environment for all.

Leave a reply

Your email address will not be published. Required fields are marked *