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Home Science & Tech

Earth is about to lose its second moon

February 2, 2021
in Science & Tech
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Earth is about to lose its second moon
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In News: Earth’s second moon will make a close approach to the planet next week before drifting off into space, never to be seen again.

About Earth’s second moon (2020 SO)

  • Astronomers call it 2020 SO — a small object that dropped into Earth’s orbit about halfway between our planet and the moon in September 2020. 
  • Temporary satellites like these are known as minimoons, though calling it a moon is a bit deceptive in this case. 
  • In December 2020, NASA researchers learned that the object isn’t a space rock at all, but rather the remains of a 1960s rocket booster involved in the American Surveyor moon missions.
  • This non-moon mini moon made its closest approach to Earth on Dec. 1, but it’s coming back for one more victory lap. 
  • Mini Moon 2020 SO will make a final close approach to Earth on Tuesday (Feb. 2) at roughly 140,000 miles (220,000 kilometers) from Earth, or 58% of the way between Earth and the moon.

2020 CD3 mini-moon

  • Astronomers have observed a small object orbiting Earth, which they have dubbed a “mini-moon” or the planet’s “second moon”.
  •  It is actually an asteroid, about the size of a car; its diameter is about 1.9-3.5 m. 
  • And unlike our permanent Moon, the mini-moon is temporary; it will eventually break free of Earth’s orbit and go off on its own way.
  • Dubbed 2020 CD3, the mini-moon was discovered by Kacper Wierzchos and Teddy Pruyne of the NASA-funded Catalina Sky Survey (CSS) in Arizona..
  • When an asteroid’s orbit crosses Earth’s orbit, it can sometimes be captured into the latter orbit. This is what happened with the 2020 CD3. 
  • It is now orbiting at a distance farther from Earth. Such an asteroid is called a Temporarily Captured Object (TCO). 
    • The orbit of such objects is unstable. 
    • They have to contend with the gravitational influence of our permanent Moon as well as that of the Sun. 
    • Once caught in Earth’s orbit, such objects usually remain for a few years before they break free and go into independent orbit around the Sun.

 

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Source: livescience.com
Tags: PrelimsScience Reporter

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