1. SPECS 2004Structures - Progress: - analyzing configuration with radial tethers - using instantaneous linear speed constraint (<= 1 m/s) and max. observation time of 300,000 seconds given in the RFP, determined deployment rate needed to accomplish an observation - model works with the assumption of no gaps between positions swept out by the center of the boresight* - using this model, mirror diameter was determined to be approximately ~1.80 m

2. SPECS 2004Structures …continued - problem occurred when observation was not complete within RFP constraint of 300,000 seconds (angular momentum was low) - from the graph above, it is determined that angular momentum must increase

3. SPECS 2004Structures - one way to increase the angular momentum would be to add thrusters to each mirror spacecraft - most of the thrust will be needed at the beginning of the observation (tether deployment phase) to get the angular momentum going early - each mirror will need thrusters to produce 2.5 Newtons of thrust (propulsion)

4. SPECS 2004Structures - Problems: - in the process of determining which perturbations affect the tethers significantly (i.e. tether heating, tether bending stiffness, solar pressure, … ) - having problems modeling tension to determine elongations in tethers (RFP constraint of <= 10 cm) - Plans: - work on writing and putting things together for upcoming chapter - work with Mischa’s paper on modeling the configuration with outer tethers only - get elongations of tethers over time - make decision on tether material (looking at Kevlar-49 and Dyneema)