Pioneer spacecraft - what cosmological direction are they travelling?

[lenfromkits]

Can anyone tell me how I could find out the exact direction that the Pioneer spacecraft are travelling? I need to figure out what direction they are travelling relative to the cosmic microwave background radiation.

Thanks.
( http://en.wikipedia.org/wiki/Pioneer_anomaly )

[phyzguy]

The CMBR arrives isotropically from all directions. The departure from isotropy is less than 1 part per thousand. If you are asking about that departure from isotropy, you might start here:

http://www.astro.ucla.edu/~wright/CMB-dipole-history.html

As to the direction they are travelling today, here is a good place to start:

http://arxiv.org/abs/1001.3686v1