5638 Deikoon (1988 TA3) is a Jupiter Trojan discovered on October 10 1988 by Shoemaker C. S. at Palomar.Photometric observations of this asteroid during 1994 were used to build a light curve showing a rotation period of 9.137 ± 0.003 hours with a brightness variation of 0.07 ± 0.01 magnitude.
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