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The WMAP's calibration is effected with the CMB dipole and measurements of [[Jupiter]]; the beam patterns are measured against Jupiter. The telescope's data are relayed daily via a 2GHz [[transponder]] providing a 667[[kbit/s]] downlink to a 70m [[Deep Space Network]] telescope. The spacecraft has two transponders, one a redundant back-up; they are minimally active — ca. 40 minutes daily — to minimize [[radio frequency interference]]. The telescope's position is maintained, in its three axes, with three [[reaction wheel]]s, [[gyroscope]]s, two [[star tracker]]s and sun sensors, and is steered with eight [[hydrazine]] thrusters.<ref name="2003Bennett" />
La base del WMAP è costituita da un [[pannello solare]] di 5 metri di diametro, il quale tiene la sonda costantemente all'ombra durante il rilevamento della radiazione di fondo <ref name="">Questo avviene mantenendo la sonda ad un'angolatura costante di 22 gradi rispetto al Sole</ref>
== Launch, trajectory, and orbit ==
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