Local rest system
The local rest frame (ger .: Local Standard of Rest , shortly LSR ) is in astronomy a fictitious reference system whose origin at the current location of the sun is chosen. This point moves with the mean speed of the stars in the sun's environment .
The sun leads together with the LSR an orbit having a radius of about 8.34 CCP in a clockwise direction (from galactic North seen) around the center of the Milky out. The track speed is about 255 km / s and the track is almost circular with an eccentricity e <0.1. It takes the sun about 230 million years to orbit the Milky Way .
Relative to the local rest system, the sun moves at about 20 km / s in the direction of the sun apex in the constellation Hercules .
application
The local rest system is useful in studying the movement of objects in our Milky Way and the structure of the Milky Way. Movements related to the local system of rest are free from the superimposed effects of the sun's own movement relative to its neighborhood.
See also
Individual evidence
- ↑ James Binney, Michael Merrifield: Galactic Astronomy . Princeton University Press , 1998, ISBN 0-691-02565-7 , p. 536.