(91205) 1998 US43

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(91205) 1998 US43
Discovery [1]
Discovered by M. W. Buie
Discovery site Kitt Peak National Obs.
Discovery date 22 October 1998
MPC designation (91205) 1998 US43
1998 US43
TNO[1] · plutino[2]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 4
Observation arc 17.29 yr (6,314 days)
Aphelion 44.214 AU
Perihelion 34.039 AU
39.127 AU
Eccentricity 0.1300
244.75 yr (89,394 d)
0° 0m 14.4s / day
Inclination 10.629°
Physical characteristics
Dimensions 111 km (estimate)[2]
0.09 (assumed)[2]
BB-BR [2]

(91205) 1998 US43, is a resonant trans-Neptunian object from the Kuiper belt located in the outermost region of the Solar System. The rather bluish body measures approximately 111 kilometers in diameter.[2] It was discovered on 22 October 1998, by American astronomer Marc Buie at the Kitt Peak National Observatory in the United States.[3]

Classification and orbit[edit]

1998 US43 is classified as a plutino,[2] so it has a 2:3 resonance with Neptune, similar to Pluto.

It orbits the Sun at a distance of 34.0–44.2 AU once every 244 years and 9 months (89,394 days). Its orbit has an eccentricity of 0.13 and an inclination of 11° with respect to the ecliptic.[1] The body's observation arc begins with its official discovery observation. Its orbit still has a fair amount of uncertainty.[3]

Physical characteristics[edit]

1998 US43 it is unlikely to ever be classified as a dwarf planet due to its relatively small size.

Based on an absolute magnitude of 8.0 and an assumed albedo of 0.09, the Johnston's Archive estimates a diameter of 111 kilometers.[2] The body's spectrum (BB-BR) suggests a somewhat bluish color.[2] As of 2017, no rotational lightcurve of 1998 US43 has been obtained from photometric observations.[4]

Numbering and naming[edit]

This minor planet was numbered by the Minor Planet Center on 28 October 2004.[5] As of 2018, it has not been named.[3]


  1. ^ a b c d e "JPL Small-Body Database Browser: 91205 (1998 US43)" (2016-02-04 last obs.). Jet Propulsion Laboratory. Retrieved 13 October 2017. 
  2. ^ a b c d e f g h "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 13 October 2017. 
  3. ^ a b c d "91205 (1998 US43)". Minor Planet Center. Retrieved 13 October 2017. 
  4. ^ "LCDB Data for (91205)". Asteroid Lightcurve Database (LCDB). Retrieved 13 October 2017. 
  5. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 February 2018. 

External links[edit]