(69990) 1998 WU31

(69990) 1998 WU₃₁

Discovery
Discovered by	Marc W. Buie
Discovery date	18 November 1998
Designations
MPC designation	(69990) 1998 WU31
Alternative names	none
Minor planet category	TNO (plutino)
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 3
Observation arc	2479 days (6.79 yr)
Aphelion	46.521 AU (6.9594 Tm)
Perihelion	31.992 AU (4.7859 Tm)
Semi-major axis	39.256 AU (5.8726 Tm)
Eccentricity	0.18505
Orbital period	245.96 yr (89838.0 d)
Mean anomaly	45.835°
Mean motion	0° 0^m 14.426^s / day
Inclination	6.5838°
Longitude of ascending node	237.19°
Argument of perihelion	142.25°
Earth MOID	30.9954 AU (4.63685 Tm)
Jupiter MOID	27.0593 AU (4.04801 Tm)
Physical characteristics
Dimensions	111 km
Geometric albedo	0.09 (assumed)
Absolute magnitude (H)	8.3

(69990) 1998 WU₃₁, also written as (69990) 1998 WU31 is a TNO that resides in the Kuiper belt. It was discovered on November 18, 1998, by Marc W. Buie at Kitt Peak National Observatory

Since it is in a 2:3 orbital resonance with the planet Neptune, it has been classified as a plutino.

References

1. "JPL Small-Body Database Browser: 69990 (1998 WU31)". NASA/Jet Propulsion Laboratory. Retrieved 6 April 2016.

• 1. http://cfa-www.harvard.edu/iau/lists/TNOs.html
• 2. http://www.johnstonsarchive.net/astro/tnoslist.html

External links

• (69990) 1998 WU31 at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters