(91133) 1998 HK151 (better known as 1998 HK151) is a plutino with a 2:3 resonance with Neptune. It was discovered on April 28 1998 by the Mauna Kea Observatory.1998 HK151 has the lowest and thus bluest measured B-V color index of any TNO. On May 24 2000 1998 HK151 set a TNO record low B-V of 0.51. Reddening of the spectrum is caused by cosmic irradiaton by ultraviolet radiation and charged particles.
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