Astrophysics (Index)About

local standard of rest

(velocity with respect to our region of the Milky Way)

The local standard of rest (LSR) is the mean motion of material in the Milky Way in the neighborhood of the Sun (solar neighborhood). When an object's radial velocity is cited, for example, the measure can be relative to the observer, which would depend upon the rotation and orbit of the Earth, or relative to the Sun, or relative to the LSR, or relative to the galactic center of the Milky Way.

The LSR velocity, the velocity of the LSR with respect to the galactic center, has been recently estimated as 255 km/s.

Further reading:

Referenced by pages:
Galactic All-sky Survey (GASS)
high-velocity cloud (HVC)
Smith Cloud
solar apex