The velocity and direction of the Cosmic Microwave Background (CMB) dipole are determined by the solar system's motion relative to the CMB. The solar system moves towards the constellation Leo at a speed of approximately 370-380 km/second, with Earth's motion around the sun contributing a minimal effect of about 30 km/second. Key references include a paper from the COBE mission authored by Charles Bennett around 2002, which provides precise coordinates for this motion. The galactic coordinates for the CMB dipole direction are approximately 264.4º, 48.4º.
PREREQUISITESAstronomers, astrophysicists, and students studying cosmology or the Cosmic Microwave Background, as well as anyone interested in the dynamics of the solar system's motion in relation to cosmic observations.
TrickyDicky said:Does anyone know how is the direction of motion from the CMB dipole determined?
Do Earth's motion around the sun affect the direction and magnitude of the velocity as seen on observations made over many months?
Thanks Marcus, I have found one post where you give the galactic coordinates direction of CMB dipole direction around 264.4º, 48.4º and a link you give in that post:http://aether.lbl.gov/www/projects/u2/ solves most of my doubts.marcus said:The Earth's motion about the sun is only about 30 km/second, so it makes a small effect.
The direction and speed of the solar system motion is given in some paper from the COBE mission, around 2002 or so. Charles Bennett was one of the authors. It gave precise coordinates.
What I remember is that the sun is moving in the general direction of the constellation LEO at
a speed of approximately 370-380 km/second.
Do you need to know exact coordinates of the direction, or a more accurate idea of the speed?