An anti-satellite missile has a total radiation sensor built into its nose. The sensor detects total radiation emitted by a hot satellite, and normally tracks to the satellite, where it impacts. A...

An anti-satellite missile has a total radiation sensor built into its nose. The sensor detects total radiation emitted by a hot satellite, and normally tracks to the satellite, where it impacts. A target satellite that is to be protected from the missile is gray with ε = 0.10, has a surface temperature of Ts=450 K, and is spherical with diameter Ds=3.2 m. You are to design a dummy countermeasure spherical satellite that is to be ejected from the real satellite as a decoy. The decoy material has the hemispherical spectral emissivity shown. The diameter of the decoy will be Dd=0.48 m.

(a) What surface temperature Td should be used for the decoy?

(b) How large a heat source (kW) is necessary in the decoy?