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Although there are different guidelines, satellites are considered “small” if they are under 500 kg (wet mass / including fuel). SmallSats are often further segmented, again using their total mass. The table below shows a commonly applied standard and will be the reference used in this eBook. 
Small Satellites (Minisatellites)  100 to 500 kg (220 to 1,100 lb)
Microsatellites  10 to 100 kg (22 to 220 lb)
Nanosatellite  1 to 10 kg (2.2 to 22 lb)

This eBook will provide strategies and technologies to help designers manage heat loads in small satellites. It covers ways to address the unique challenges associated with SmallSats, including compact designs and increasing power densities.