5.9 Future satellite experiments Two new satellite experiments to study the CMB have recently been
selected as future missions. These are MAP, or Microwave Anisotropy Probe, which has been selected by
NASA as a Midex mission, for launch in August 2000, and the Planck Surveyor, which has been selected by
ESA as an M3 mission, and will be launched hopefully soon after 2005. An artist’s impression of
the MAP satellite, which has five frequency channels from 30 GHz to 100 GHz, is shown in
Figure 17: Artist’s impression of the MAP Satellite.
An artist’s impression of the Planck Surveyor satellite, which combines both HEMT and
bolometer technology in 10 frequency channels covering the range 30 GHz to 850 GHz, is shown in
Figure 18: Artist’s impression of the Planck Surveyor Satellite (formally COBRAS/SAMBA)
A crucial feature of a satellite experiment is the potential all-sky coverage that it affords, and the ability
to map features on large angular scales ( 10°).
Figure 19: Expected capability of a satellite experiment as a function of resolution. The percentage
error in recovering cosmological parameters from the CMB power spectrum is shown versus the
resolution available. This figure is taken from Bersanelli et al. 1996 .