Abstract
Since January 1, 1900, asteroid 415029 (2011 UL21) is considered one of the top 10 largest asteroids that have passed within 7.5 million kilometers from Earth. This asteroid belongs to the Apollo group of asteroids, and it is classified as a potentially hazardous Asteroid (PHA). This paper presents a concise overview of the gigantic asteroid 2011 UL21 that was discovered in 2011 by the Catalina Sky Survey (CSS). Additionally, we try to highlight the physical properties of that giant space rock, including its size, speed, and composition.
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