# Vertical speed vector at which the sun travels to and from the galactic equator

What is the speed of progression of the sun toward and away from the galactic equator during its orbit?

The Sun moves at about 15-20 km/s with respect to a local standard of rest defined by the general motion of stars in our vicinity around the Galaxy. In three-dimensions, this "peculiar velocity" is $$U=10.00 \pm 0.36$$ km/s (radially inwards), $$V=5.25 \pm 0.62$$ km/s (in the direction of Galactic rotation) and $$W=7.17 \pm 0.38$$ km/s (up and out of the plane). (Dehnen & Binney 1998). Different authors arrive at velocities that differ by $$\sim 1-2$$ km/s from these values and so this would probably be a more conservative estimate of the uncertainties.