1998 KY26

Asteroid 1998 KY26 was discovered by the Spacewatch telescope in Arizona as it passed two lunar distances from Earth in June 1998.  A few days later, it was observed by the Goldstone radar in California and by optical telescopes in the Czech Republic, Hawaii, Arizona, and California.  The observations reveal a lumpy spheroid with a diameter of about 30 meters, a composition analogous to carbonaceous chondritic meteorites, and a rotation period on 10.7 minutes, which is too rapid for 1998 KY26 to consist of multiple components bound together just by their mutual gravitational attraction.  1998 KY26 is more accessible to spacecraft than any other solar system object with a well known orbit.