|Discovered by||Mauna Kea Observatory|
|Discovery date||28 April 1998|
|Epoch 13 January 2016 (JD 2457400.5)|
|Uncertainty parameter 3|
|Observation arc||1178 days (3.23 yr)|
|Aphelion||48.529 AU (7.2598 Tm)|
|Perihelion||30.347 AU (4.5398 Tm)|
|39.438 AU (5.8998 Tm)|
|247.67 yr (90462.3 d)|
|0° 0m 14.327s / day|
|Dimensions||134 km (Johnston's archive)|
|(Blueish;lowest TNO B-V) B-V=0.51; V-R=0.43|
(91133) 1998 HK151, also written as (91133) 1998 HK151 is a resonant trans-Neptunian object from the Kuiper belt, located in the outermost region of the Solar System. It measures approximately 134 kilometers in diameter. It was discovered by astronomers at the Mauna Kea Observatory on 28 April 1998.
1998 HK151 has the lowest, and thus bluest measured B-V color index of any TNO. On 24 May 2000, 1998 HK151 set a TNO record low B-V of 0.51. Reddening of the spectrum is caused by ultraviolet radiation and charged particles. Becoming bluer in the spectrum is caused by impact collisions exposing the interior of an object.
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