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(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.

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 9 months (116,804 days). Its orbit has an eccentricity of 0.15 and an inclination of 10° with respect to the ecliptic. This makes it a relatively eccentric body for a classical Kuiper belt object, which typically have low-eccentricities of 0.10 or less.

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).

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. 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)" (2016-03-13 last obs.). Jet Propulsion Laboratory. Retrieved 31 August 2016.
2. ^ "LCDB Data for (79983)". Asteroid Lightcurve Database (LCDB). Retrieved 31 August 2016.
3. ^ 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/0601257. Bibcode:2006AJ....131.2314L. doi:10.1086/501047. Retrieved 31 August 2016.
4. ^ 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:1209.1896. 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:1206.3153. Bibcode:2012A&A...546A..86P. doi:10.1051/0004-6361/201219057. Retrieved 31 August 2016.
6. "79983 (1999 DF9)". Minor Planet Center. Retrieved 31 August 2016.

External links

• http://www.webcitation.org/5Pkgpyk4n?url=http%3A%2F%2Fcfa-www.harvard.edu%2Fiau%2Flists%2FTNOs.html
• http://www.johnstonsarchive.net/astro/tnoslist.html
• http://hamilton.dm.unipi.it/cgi-bin/astdys/astibo?objects:1999DF9;main
• Asteroid Lightcurve Database (LCDB), query form (info)
• Dictionary of Minor Planet Names, Google books
• Discovery Circumstances: Numbered Minor Planets (75001)-(80000) – Minor Planet Center
• (79983) 1999 DF9 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

• Classical Kuiper belt objects
• Numbered minor planets
• Discoveries by Jane Luu
• Discoveries by Chad Trujillo
• Discoveries by David C. Jewitt
• Astronomical objects discovered in 1999