As noted by others in Forum responses to my discussion of low mass “Star Trackers”, progress has been made by established suppliers for these units.

But note that my ½ gram CAMERA unit INCLUDES its housing and optics. Admittedly a good computer may also weigh ½ gram, although a minimal computer weighs less than 0.01 gram. Brackets, and similar parts tend to have a mass which is proportional to the mass of the assembly they hold.

My point is that our assumptions – even mine – are quickly becoming our of date. A new generation of experimental spacecraft and satellites are going to make “Yesterday's” standards look pathetic. The one kilogram CubeSat is soon going to become the equivalent of an old “Low Cost, Small Satellite” for developmental work with similar technical capability (at about 1/100 of the launch cost), and the MicroSat is going to become a unit with mind boggling performance!

I have been doing some serious modeling for active array antennas, using low cost commercial components, on such a MicroSatellite, and the focused RF, multi subscriber capability makes satellite “Narrowcasting” quite practical!