(79983) 1999 DF9

(79983) 1999 DF₉

Discovery
Discovered by	C. Trujillo, D. C. Jewitt, and J. X. Luu
Discovery date	20 February 1999
Designations
Alternative names	none
Minor planet category	TNO (cubewano)
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 4
Observation arc	1857 days (5.08 yr)
Aphelion	53.761 AU (8.0425 Tm)
Perihelion	39.802 AU (5.9543 Tm)
Semi-major axis	46.782 AU (6.9985 Tm)
Eccentricity	0.14919
Orbital period	319.98 yr (116872 d)
Mean anomaly	18.014°
Mean motion	0° 0^m 11.089^s / day
Inclination	9.7977°
Longitude of ascending node	334.81°
Argument of perihelion	178.06°
Earth MOID	38.8129 AU (5.80633 Tm)
Jupiter MOID	34.4104 AU (5.14772 Tm)
Physical characteristics
Dimensions	265 km
Rotation period	6.65 h (0.277 d)
Absolute magnitude (H)	6.1

(79983) 1999 DF₉, also written as (79983) 1999 DF9, is a cubewano. It travels in a highly eccentric orbit which has a perihelion (closest approach to the Sun) at 39.797 AU and an aphelion (farthest approach from the Sun) at 53.264 AU. It is about 265 km in diameter. It was discovered on February 20, 1999, by Jane X. Luu, Chadwick A. Trujillo and David C. Jewitt.

Due to its small size, it is unlikely to be classified as a dwarf planet.

References

1. "JPL Small-Body Database Browser: 79983 (1999 DF9)". NASA/Jet Propulsion Laboratory. Retrieved 7 April 2016.

1. http://cfa-www.harvard.edu/iau/lists/TNOs.html 2. http://www.johnstonsarchive.net/astro/tnoslist.html 3. http://hamilton.dm.unipi.it/cgi-bin/astdys/astibo?objects:1999DF9;main

External links

• (79983) 1999 DF9 at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters