(91133) 1998 HK151

(91133) 1998 HK151
Discovered byMauna Kea Observatory
Discovery date28 April 1998
plutino (TNO)
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 3
Observation arc1178 days (3.23 yr)
Aphelion48.529 AU (7.2598 Tm)
Perihelion30.347 AU (4.5398 Tm)
39.438 AU (5.8998 Tm)
247.67 yr (90462.3 d)
0° 0m 14.327s / day
Physical characteristics
Dimensions134 km (Johnston's archive)
0.09 (assumed)
(Blueish;lowest TNO B-V) B-V=0.51; V-R=0.43[2]

(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.[1]


1998 HK151 is classified as a plutino, a dynamical group named after Pluto. Members of this group stay in a 2:3 resonance with Neptune.

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.

Based on an absolute magnitude of 7.62, 1998 HK151, the Johnston's Archive estimates a diameter of 134 kilometers, assuming an albedo of 0.09.


  1. ^ a b "91133 (1998 HK151)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 8 April 2016.
  2. ^ "TNO Colors". Planetary Data System (PDS Asteroid/Dust Archive). Archived from the original on 2006-09-08. Retrieved 2007-09-09.

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