11509 Thersilochos (1990 VL6) is a Jupiter Trojan discovered on November 15 1990 by Belgian astronomer E. W. Elst at the European Southern Observatory.Photometric observations of this asteroid during 2010 were used to build a light curve showing a rotation period of 17.367 ± 0.015 hours with a brightness variation of 0.27 ± 0.01 magnitude.
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