What is unknown celestial body turning around the earth other than "moon"?

The celestial body revolving around the planet is called "satellite"The moon turning around the earth is often mentioned as an example. Except for the satellite except for the moon, there seems to be no satellite of the earth, but it seems that there are no satellites of the earth, but it looks like an asteroid turning round and round around the earth and taking a complex helical trajectory different from the ellipse3753 Cruithne (Cruise)There is a known existence.

Earth's other 'moon' and its crazy orbit could reveal mysteries of the solar system
https://theconversation.com/earths-other-moon-and-its-crazy-orbit-could-reveal-mysteries-of-the-solar-system-38010

You can see how the Kurusun turns around the earth with the following movie.

Near-Earth Asteroid 3753 Cruithne - YouTube


The middle celestial body is the sun, the leftmost is the earth, the small yellow dot between the earth and the sun shows the crouth.


For the earth turning around the sun in orbits close to a circle, Kruthon draws an elliptical orbit.


In order to show the positional relationship between the earth and Kurusun, I will insert a green line.


It is like this when drawing the distance from Krouss with the white line around the Earth.


Looking at the figure that the white line draws, you can see that the trajectory of Kurusun to the earth draws like a straw like a warped ellipse. The shape of this trajectory is academically "Horseshoe shapeIt is expressed as.


Next, this is a movie that can understand the trajectory of Kurusun when centering on the earth. It expresses a state of looking at the solar system "from above" on an object moving at the same speed as the Earth.

Near-Earth Asteroid 3753 Cruithne - YouTube


Kurusun continuing circling with a straw shaped.


In relation to the sun / earth, Kurusun will draw a straw type while changing the relative position.


Kurusun who is turning at the farthest position from the earth is like this.


Again, it came close to the earth.


Three-dimensional view of Kurusun 's orbit as if the earth and the sun are overlapping, you can see that it orbits in a spiral like' fluctuating 'up and down with respect to the plane of revolution of the earth.


Kurusun came back to the original position after a long round. The time it takes to go around is about 800 years.


Krusun is a relatively new asteroid discovered in 1986, not strictly a satellite, but a celestial body called "asteroid near the earth". Although Kroons is a relatively small object with a diameter of about 5 km, the mass is estimated to be 130 billion tons and it is believed that if you hit Earth it caused extinction of dinosaursCretaceousThe impact of the same scale as the collision of the meteorite is said to occur. However, the possibility of collision is known to be as small as unlimitedly zero, and it is speculated that it will be the closest time to the earth next to 2750 years.