The 'second moon' is discovered on the earth, it is temporary to be near the earth in a mini size of 2-3 meters

The moon orbits the Earth in orbit, but it turns out that a new celestial body has been added to the moon. The second moon on Earth, discovered on February 15, 2020, is about 1.9-3.5 m in diameter, and is considered to be a temporary earth satellite because of its unstable orbit.

Earth has acquired a brand new moon that's about the size of a car | New Scientist
https://www.newscientist.com/article/2235427-earth-has-acquired-a-brand-new-moon-thats-about-the-size-of-a-car/

New 'mini-moon' orbiting Earth — for now, astronomers say
https://www.nbcnews.com/science/space/new-mini-moon-orbiting-earth-now-astronomers-say-n1143596

Kacper Wierzchos, a member of the Catalina Sky Survey, an observation project at the University of Arizona's Lunar and Planetary Research Institute, said on February 26, `` In the Earth's orbit, a small moon-like object '2020 CD3' Was found to be temporarily captured by the Earth, a 20- mag object discovered by me and Teddy Pruyne, my teammates on the Catalina Sky Survey, on the night of February 15. That ’s it ”on Twitter.

BIG NEWS (thread 1/3) .Earth has a new temporarily captured object / Possible mini-moon called 2020 CD3.On the night of Feb. 15, my Catalina Sky Survey teammate Teddy Pruyne and I found a 20th magnitude object.Here are the discovery images.pic.twitter.com/zLkXyGAkZl

— Kacper Wierzchos (@WierzchosKacper) February 26, 2020

Wierzchos et al. Performed more than 30 observations by February 17 to confirm the existence and orbit of the 2020 CD3. Wierzchos says, '2020 CD3 is a C-type asteroid with a diameter of 1.9 to 3.5 m. Even though its size is small, this is a big discovery, because nearly one million asteroids have been discovered so far. Is the second asteroid known to orbit the Earth. '

(3/3) The object has a diameter between 1.9-3.5 m assuming a C-type asteroid albedo.But it's a big deal as out of ~ 1 million known asteroids, this is just the second asteroid known to orbit Earth (after 2006 RH120, which was also discovered by the Catalina Sky Survey).

— Kacper Wierzchos (@WierzchosKacper) February 26, 2020

The Catalina Sky Survey also discovered the 2006 RH120 , the 'second month' orbiting Earth in 2006 . The orbit of the previously discovered '2006 RH120' was unstable only from September 2006 to June 2007, but the orbit of '2020 CD3' was also considerable. It is unstable.

The following is the result of actually simulating the trajectory of '2020 CD3'. The 2020 CD3 was captured by the Earth about three years ago, and has been orbiting the Earth in about 47 days since then.

(2/3) The object has just been announced by the MPC and its orbit shows that it entered Earth's orbit some three years ago.Here is a diagram of the orbit created with the orbit simulator written by Tony Dunn: pic.twitter.com / 2wsJGtexiO

— Kacper Wierzchos (@WierzchosKacper) February 26, 2020

In April 2020, Queens University Belfast astronomer Grigori Fedorets told British science journal New Scientist, `` While we're doing this, '2020 CD3' is moving away from Earth. '' Also pointed out that there is a possibility that the satellite may escape from orbit of the earth.