Bisei Spaceguard Center Contact us

  Observation of celestial bodies

There are a lot of tiny celestial bodies in our solar system. By April 2003, the precise orbits of 60,000 such objects had been determined. The orbits of an additional 140,000 objects have been roughly calculated, bringing the total of known objects to more than 200,000, a number which is expected to increase in the future. Objects that approach the Earth are called Near Earth Objects (NEOs). Currently there are approximately 2,000 known NEOs, none of which is expected to enter the Earth’s atmosphere or crash into our planet. However, there are countless NEOs that must be found and tracked with the possibility in mind. BSGC continues to search for new NEOs by taking photos of the same area of the sky at scheduled intervals during the same night, then comparing these photos to identify moving objects. When a new NEO is discovered, BSGC continues making observations and detailed analysis, and sends the data to the Minor Planet Center belonging to the International Astronomical Union (IAU). On the basis of data collected from all over the world, the orbits of NEOs can be determined accurately.

Tiny celestial bodies in the solar system. About 5,000 objects are shown in the picture. The orbits of planets from inside: Mercury, Venus, the earth, Mars and Jupiter.
Please click the figure. Download player for watching the movement of celestial bodies.
A tiny celestial body, 2002 NY40, which came to the nearest to the earth (about 1,300,000 Km) in August 2002.

Copyright(C) Japan Spaceguard Association. All Rights Reserved.