(79983) 1999 DF9

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The correct title of this article is (79983) 1999 DF₉. It features superscript or subscript characters that are substituted or omitted because of technical limitations.

**(79983) 1999 DF₉**
Discovery ^A

Discoverer	C. Trujillo, D. C. Jewitt, and J. X. Luu
Discovery date	February 20, 1999
Alternate designations ^B	none
Category	TNO (cubewano)
Orbital elements ^C
Epoch 20070410 JD
Eccentricity (e)	0.145
Semi-major axis (a)	46.531 AU
Perihelion (q)	39.797 AU
Aphelion (Q)	53.264 AU
Orbital period (P)	115934 d (317.41 a)
Mean orbital speed	?
Inclination (i)	9.8°
Longitude of the ascending node (Ω)	334.9°
Argument of perihelion (ω)	178.3°
Mean anomaly (M)	8.1°
Physical characteristics ^D
Dimensions	265 km
Mass	?
Density	?
Surface gravity	?
Escape velocity	?
Rotation period	?
Spectral class	?
Absolute magnitude	6.1
Albedo (geometric)	?
Mean surface temperature	?
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(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.

[edit] References

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

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v • d • e Trans-Neptunian objects

Pronunciation guide Objects in italics are unnnumbered.

Plutinos	Pluto¹ · 1993 SB · 1993 SC · 1994 JR₁ · 1994 TB · 1995 QZ₉ · 1996 SZ₄ · 1996 TP₆₆ · 1996 TQ₆₆ · 1997 QJ₄ · 1998 HK₁₅₁ · 1998 US₄₃ · 1998 VG₄₄ · 1998 WW₂₄ · 1998 WU₃₁ · 38083 Rhadamanthus · 1999 TC₃₆ · 38628 Huya · 28978 Ixion · 2002 KX₁₄ · 2002 VR₁₂₈ · 2003 VS₂ · 90482 Orcus · 1993 RO · 1993 RP · 2003 AZ₈₄ · 2001 QF₂₉₈

Cubewanos	1992 QB₁ · 1994 GV₉ · 1994 JQ₁ · 1994 VK₈ · 1995 GJ · 1995 SM₅₅ · 1996 TO₆₆ · 58534 Logos · 1997 CS₂₉ · 1997 CU₂₉ · 1998 HJ₁₅₁ · 1998 HP₁₅₁ · 1998 HM₁₅₁ · 1998 KR₆₅ · 19521 Chaos · 1998 WA₂₅ · 1999 DF₉ · 1999 HT₁₁ · 53311 Deucalion · 20000 Varuna · 2002 AW₁₉₇ · 50000 Quaoar · 2002 TX₃₀₀ · 2002 UX₂₅ · 2003 EL₆₁ · 2003 OP₃₂ · 2004 GV₉ · 2005 FY₉ · 2005 RN₄₃ · 88611 Teharonhiawako · 1998 WW₃₁ · 2002 MS₄ · 2003 MW₁₂ · 2003 QW₉₀

Twotinos	1996 TR₆₆ · 1998 SM₁₆₅ · 1999 RB₂₁₆ · 2000 JG₈₁ · 2002 WC₁₉ · 1997 SZ₁₀

Other resonant objects	1994 JS · 1995 DA₂ · 1998 WA₃₁ · 1999 CP₁₃₃ · 1999 DE₉ · 1999 HB₁₂ · 2001 KC₇₇ · 2001 KP₇₇ · 2002 TC₃₀₂ · 2003 LG₇

Scattered disc objects	Eris^{1, 2} · 1995 TL₈ · 1996 GQ₂₁ · 1996 TL₆₆ · 1999 CC₁₅₈ · 2000 EE₁₇₃ · 2000 OO₆₇ · 2000 OM₆₇ · 2001 UR₁₆₃ · 2002 CY₂₂₄ · 2002 GX₃₂ · 2002 RP₁₂₀ · 90377 Sedna² · 2005 RM₄₃ · 2000 CR₁₀₅ 2004 XR₁₉₀ · 2005 TN₇₄ · 2006 QH₁₈₁

Unclassified	1997 CR₂₉ · 1998 SN₁₆₅ · 1999 CL₁₅₈ · 1999 HC₁₂ · 1999 KR₁₆ · 1999 OY₃ · 2003 FY₁₂₈ · 2004 SB₆₀ · 2004 TY₃₆₄ · 2005 RR₄₃

Natural satellites	Charon (Pluto) · Hydra (Pluto) · Nix (Pluto) · Dysnomia (Eris) · S/2000 (1998 WW₃₁) 1 · S/2005 (2003 EL₆₁) 1 · S/2005 (2003 EL₆₁) 2 · Zoe (Logos) · S/2005 (79360) 1 · Sawiskera (Teharonhiawako)

¹ Also classified as a dwarf planet. ² Although currently classified as an SDO, Eris and Sedna may be part of the inner Oort Cloud.