- This event has passed.
A statistical survey was conducted on about 790,000 asteroids whose orbital elements are currently registered.
・From the histogram of a, two hundreds of concentration are seen around Pluto. These are in resonance with Neptune.
・There are approximately 1000 pieces near the earth (a: 0.95 to 1.05), but when i <10 and e <0.02, it becomes 5 pieces.
・ Only 101 reverses have been found, what is their origin ?
・ Cleopatra, Itokawa, Ultima Toure are united asteroid ?
・ Others
