(4489) 1988 AK is a rare-type Jupiter trojan from the Greek camp, approximately 92 kilometers in diameter. It was discovered by American astronomer Edward Bowell at the U.S. Anderson Mesa Station, Arizona, on 15 January 1988. On December 18, 2012, 4489 has occulted the star TYC 2467-00054-1 over parts of the United States. 1988 AK's level of brightness equals magnitude 16.1 and the star's 11.1. Photometric observations of this asteroid during 2010 were used to build a light curve showing a rotation period of 12.582 ± 0.004 hours with a brightness variation of 0.22 ± 0.01 magnitude.