(79983) 1999 DF9

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(79983) 1999 DF9
Discovery [1]
Discovered by J. X. Luu
C. Trujillo
D. C. Jewitt
Discovery site Kitt Peak National Obs.
Discovery date 20 February 1999
MPC designation (79983) 1999 DF9
1999 DF9
TNO[1] · cubewano
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 3
Observation arc 17.06 yr (6,231 days)
Aphelion 53.666 AU
Perihelion 39.822 AU
46.744 AU
Eccentricity 0.1481
319.59 yr (116,731 days)
0° 0m 11.16s / day
Inclination 9.8046°
Physical characteristics
Dimensions 265.17 km (calculated)[2]
6.65 h[3]
0.10 (assumed)[2]
B–V = 0.920±0.060[4]
V–R = 0.710±0.050[4]
V–I = 1.360±0.060[4]
5.797±0.110 (R)[5] · 6.0[2] · 6.1 (MPO58491)[1]

(79983) 1999 DF9 is a trans-Neptunian object of the Kuiper belt, classified as a non-resonant cubewano, that measures approximately 265 kilometers in diameter. It was discovered on 20 February 1999, by American and British astronomers Jane Luu, Chad Trujillo and David C. Jewitt at the U.S. Kitt Peak National Observatory in Arizona.[6]

The carbonaceous minor planet is a classical Kuiper belt object ("cubewano"), which are not in an orbital resonance with Neptune and do not cross the giant planet's orbit. It orbits the Sun at a distance of 39.8–53.7 AU once every 319 years and 7 months (116,731 days). Its orbit has an eccentricity of 0.15 and an inclination of 10° with respect to the ecliptic.[1] This makes it a relatively eccentric body for a classical Kuiper belt object, which typically have low-eccentricities of 0.10 or less. As no precoveries were taken, the minor planet's observation arc begins with its discovery observation in 1999.[6]

In 2006, a rotational light-curve was published for this minor planet from photometric observations by Portuguese astronomer Pedro Lacerda and the discovering astronomer Janue Luu. The light-curve gave a relatively short rotation period of 6.65 hours with a brightness variation of 0.40 magnitude (U=2).[3]

The Collaborative Asteroid Lightcurve Link assumes a low albedo of 0.10 and calculates a diameter of 265.2 kilometers, based on an absolute magnitude of 6.0.[2] Due to its small size, it is unlikely to be classified as a dwarf planet.


  1. ^ a b c d e "JPL Small-Body Database Browser: 79983 (1999 DF9)" (2016-03-13 last obs.). Jet Propulsion Laboratory. Retrieved 14 December 2016. 
  2. ^ a b c d e "LCDB Data for (79983)". Asteroid Lightcurve Database (LCDB). Retrieved 31 August 2016. 
  3. ^ a b Lacerda, Pedro; Luu, Jane (April 2006). "Analysis of the Rotational Properties of Kuiper Belt Objects" (PDF). The Astronomical Journal. 131 (4): 2314–2326. arXiv:astro-ph/0601257Freely accessible. Bibcode:2006AJ....131.2314L. doi:10.1086/501047. Retrieved 31 August 2016. 
  4. ^ a b c Hainaut, O. R.; Boehnhardt, H.; Protopapa, S. (October 2012). "Colours of minor bodies in the outer solar system. II. A statistical analysis revisited". Astronomy and Astrophysics. 546: 20. arXiv:1209.1896Freely accessible. Bibcode:2012A&A...546A.115H. doi:10.1051/0004-6361/201219566. Retrieved 31 August 2016. 
  5. ^ Peixinho, N.; Delsanti, A.; Guilbert-Lepoutre, A.; Gafeira, R.; Lacerda, P. (October 2012). "The bimodal colors of Centaurs and small Kuiper belt objects" (PDF). Astronomy and Astrophysics. 546: 12. arXiv:1206.3153Freely accessible. Bibcode:2012A&A...546A..86P. doi:10.1051/0004-6361/201219057. Retrieved 31 August 2016. 
  6. ^ a b "79983 (1999 DF9)". Minor Planet Center. Retrieved 31 August 2016. 

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