THE SPIN STATES OF NEAR-EARTH ASTEROIDS (NEAS) ARE FUNDAMENTAL PHYSICAL PROPERTIES OF THESE OBJECTS. UNDERSTANDING THE POLE DIRECTIONS AND SPIN RATES OF A REPRESENTATIVE SAMPLE OF NEAS IS ESSENTIAL TO UNDERSTANDING THE NEAR-EARTH POPULATION AS A WHOLE. KNOWING THE SPIN STATES OF INDIVIDUAL OBJECTS IS ALSO NECESSARY TO CHARACTERIZE THEIR SHAPES TO PREDICT THEIR LONG-TERM TRAJECTORIES AND FOR PLANNING SPACECRAFT MISSIONS. HOWEVER POLE DIRECTIONS ARE CURRENTLY ONLY AVAILABLE FOR ABOUT 75 NEAS.RADAR ASTRONOMICAL OBSERVATIONS USING THE HIGH-POWER TRANSMITTERS OF THE ARECIBO OBSERVATORY AND THE GOLDSTONE SOLAR SYSTEM RADAR CAN PROVIDE THE HIGHEST-RESOLUTION CHARACTERIZATION OF NEA SPIN STATES AND SHAPES OF ANY GROUND-BASED TECHNIQUE OFTEN COMPARABLE TO A SPACECRAFT FLYBY. HOWEVER RADAR IMAGING FREQUENTLY PROVIDES ONLY AMBIGUOUS CONSTRAINTS ON THE SPIN STATES AND SHAPES OF RADAR TARGETS. RADAR SPECKLE TRACKING ALLOWS UNAMBIGUOUS SPIN STATE MEASUREMENTS FOR MANY OF THE BEST NEA RADAR TARGETS BY TRACKING THE MOTION OF A TARGET S RADAR ECHO PATTERN BETWEEN MULTIPLE RECEIVE STATIONS SPREAD ACROSS HUNDREDS OF KILOMETERS. SPIN STATE MEASUREMENTS FROM SPECKLE TRACKING CAN ALLOW US TO ESTIMATE THE THREE-DIMENSIONAL SHAPES OF NEAS WHEN WE WOULD OTHERWISE BE UNABLE TO DO SO. FOR EXAMPLE: RADAR SPECKLE TRACKING WAS ESSENTIAL TO DETERMINE THE SPIN STATE AND SHAPE OF 2008 EV5 NOW THE PRIMARY TARGET FOR THE ASTEROID REDIRECT ROBOTIC MISSION. SPECKLE OBSERVATIONS HAVE BECOME A ROUTINE PART OF RADAR OBSERVING CAMPAIGNS. WE PROPOSE TO CONTINUE SPECKLE OBSERVATIONS INVESTIGATING THE SPIN STATES OF ABOUT 10 RADAR TARGETS PER YEAR. THE NUMBER OF SPECKLE TARGETS OBSERVED COULD BE GREATER IF THE OVERALL AMOUNT OF RADAR OBSERVING TIME INCREASES. WE WILL TRANSMIT WITH ARECIBO OR GOLDSTONE AND RECEIVE WITH ELEMENTS OF THE VERY LONG BASELINE ARRAY (VLBA). THE SPIN STATE CONSTRAINTS FROM RADAR SPECKLE TRACKING WILL BE USED IN CONJUNCTION WITH RADAR IMAGING DATA TO PRODUCE COMBINED SHAPE AND SPIN STATE MODELS AND IMPROVED TRAJECTORY PREDICTIONS. WE HAVE IDENTIFIED KNOWN NEAS THAT CAN BE OBSERVED WITH SPECKLE TRACKING BUT THE MAJORITY OF OUR SPECKLE TARGETS WILL BE NEW DISCOVERIES. WE WILL GIVE PRIORITY TO POTENTIALLY HAZARDOUS ASTEROIDS AND TO ACCESSIBLE SPACECRAFT MISSION TARGETS. THE NATIONAL RADIO ASTRONOMY OBSERVATORY HAS ALREADY ALLOCATED OBSERVING TIME FOR RADAR SPECKLE RECEIVE WITH THE VLBA THROUGH THE END OF 2018. WE WILL PROPOSE FOR ADDITIONAL VLBA TIME IN MID-2018. RADAR SPECKLE OBSERVING TIME AT ARECIBO AND GOLDSTONE WILL BE COORDINATED WITH THE RADAR IMAGING OBSERVING SCHEDULE.