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		| Paper: | 
		Design of the ST3 Formation Flying Interferometer | 
	 
	
		| Volume: | 
		194, Working on the Fringe: Optical and IR Interferometry from Ground and Space | 
	 
	
		| Page: | 
		366 | 
	 
	
		| Authors: | 
		Lay, O. P.; Blackwood, G. H.; Dubovitsky, S.; Gorham, P. W.; Linfield, R. P. | 
	 
	
	
		| Abstract: | 
		We present the enabling concept and technology for a dual spacecraft formation-flying optical interferometer, to be launched into a deep space orbit as Space Technology 3 in 2003. The combiner spacecraft makes use of a nested cat's eye delay line configuration that minimizes wavefront distortion and stores 20 m of optical pathlength in a package of 1.7 m length. A parabolic trajectory for the secondary collector spacecraft enables baselines of up to 200 m for spacecraft separations of order 1 km and a fixed 20 m stored delay. | 
	 
	
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