(278361) 2007 JJ43

(7005278361000000000♠278361) 2007 JJ₄₃
Discovery^[1]
Discovered by	Palomar Observatory
Discovery date	14 May 2007
Designations
Alternative names	2007 JJ₄₃
Minor planet category	TNO Cubewano^[2]
Orbital characteristics^[3]^[1]
Epoch 2011-08-27 0:00UTC (JD 7006245580050000000♠2455800.5)
Aphelion	7012828333881916849♠55.3707 AU
Perihelion	7012602544319690632♠40.2776 AU
Semi-major axis	7012715377017687400♠47.82 AU
Eccentricity	6999157800000000000♠0.1578
Orbital period	330.74 a (7010104372064000000♠120801 d)
Mean anomaly	331.84°
Inclination	12.0623°
Longitude of ascending node	272.493°
Argument of perihelion	9.02°
Physical characteristics
Dimensions	7005610000000000000♠610+170 −140 km^[4] 614 km (0.10 albedo)^[5] 730 km (0.09 albedo)^[2]
Rotation period	12.097 h ^[4] 6.04 hr?^[1]
Apparent magnitude	20.8 ^[6]
Absolute magnitude (H)	3.2 ^[7] 3.9 ^[1]

(268361) 2007 JJ₄₃ is a trans-Neptunian object (TNO) orbiting the Sun near the outer edge of the Kuiper belt. Based on how bright it appears, it is a possible dwarf planet.

Its discovery images were taken in 2007, and its absolute magnitude of 4.4 is one of the twenty brightest exhibited by TNOs. Assuming it has a typical albedo, this would make it roughly the same size as Ixion (about 650–800 km diameter). Mike Brown's website lists it as a "highly likely" dwarf planet,^[5] but its diameter has never been measured. In "K2 Science Conference" Robert Szabo wrote (278361) 2007 JJ₄₃ - 7005610000000000000♠610+170
−140 km.^[4]

Observations by Brown in 2012, using the W. M. Keck Observatory, suggest that (278361) 2007 JJ₄₃ does not have a companion.^[8]

As of 2014, it is about 41.3 AU from the Sun.^[6]

References

1 2 3 4 JPL Small-Body Database Browser: 2007 JJ43 Retrieved: 2011-06-18
1 2 Wm. Robert Johnston (20 August 2011). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 2012-02-03.
↑ AstDys 2007 JJ₄₃ Summary Retrieved: 2012-02-03
1 2 3 "PUSHING THE LIMITS: K2 OBSERVATIONS OF THE TRANS-NEPTUNIAN OBJECTS 2002 GV31 AND (278361) 2007 JJ43" (PDF).
1 2 Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. Retrieved 2011-08-25.
1 2 "AstDys 2007 JJ₄₃ Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2012-02-03.
↑ A Southern Sky and Galactic Plane Survey for Bright Kuiper Belt Object
↑ Plutokiller (2012-02-03). "2007 JJ43 doesn't have a big moon. There could be a small one hiding in there". Twitter. Retrieved 2012-02-03. (moonless)

Dwarf planets

Asteroid belt	IAU: Ceres No longer rounded and therefore not dwarf planets: Vesta (disrupted out of equilibrium)

Centaurs	Possibly: Chariklo Chiron

Centaurs (extended)	Possibly: 1995 SN55 Ceto 2010 TY53

Plutinos	IAU: Pluto Additional objects proposed by Brown and Tancredi: Orcus Ixion 2003 AZ₈₄ 2004 UX₁₀ Huya Possibly: 2003 UZ₄₁₃ 2003 VS₂ 2002 VR₁₂₈ 2004 PF₁₁₅ 2002 XV93 2007 JH43 2001 QF298

Twotinos	Possibly: 2002 WC₁₉

Other resonances/ unknown resonances:	IAU: Haumea Possibly: 2002 XW₉₃ 1999 DE₉ 1999 KR₁₆ 2001 YH₁₄₀ 2011 GM27 2010 VK201 2013 FZ27 2014 UM33 1999 CD158

Cubewanos:	IAU: Makemake Additional objects proposed by Brown and Tancredi: 2002 MS₄ Salacia Quaoar Varuna Varda 2004 GV₉ 2002 AW₁₉₇ 2002 TX₃₀₀ 2005 RR₄₃ 2003 OP₃₂ 2005 RN₄₃ Possibly: Chaos Altjira Sila-Nunam 2002 UX₂₅ 2007 JJ₄₃ 2005 UQ₅₁₃ 2004 TY₃₆₄ 2003 QW₉₀ 1998 SN₁₆₅ 2002 KX₁₄ Praamzius 2004 NT₃₃ 2010 FX86 2002 CY248 2010 VR11 Rhadamanthus

Scattered disc	IAU: Eris Additional objects proposed by Brown and Tancredi: 2007 OR₁₀ 1996 TL₆₆ 2001 UR₁₆₃ 2005 RM₄₃ Possibly: 2002 TC₃₀₂ 2004 XA₁₉₂ 2005 QU₁₈₂ 2006 QH181 2007 UK₁₂₆ 2010 EK139 2010 KZ39 2010 RE64 2010 RF43 2010 TJ 2013 FY27 2008 OG19 1996 GQ₂₁ 2012 HH₂ 1999 CC₁₅₈ 2006 HH123 2010 VZ98

Area uncertain	Captured satellites that were once dwarf planets: Triton (captured by Neptune) Phoebe (captured by Saturn, and was then disrupted out of equilibrium) Possibly: 2011 FW62 (lost) 2000 YW₁₃₄ V774104

Detached objects	Possibly: 2004 XR190 2010 GB174 2008 ST291 1995 TL₈ 2005 TB₁₉₀ 2003 QX113 2003 FY₁₂₈ 2004 VN112 2000 CR₁₀₅

Sednoids	Objects proposed by Brown and Tancredi: Sedna Possibly: 2012 VP113

Former candidates	Pallas Vesta Hygiea Cybele

See also: Charon Vanth Dysnomia Hiʻiaka Mesoplanet Planemo List of trans-Neptunian objects List of possible dwarf planets List of Solar System objects List of Solar System objects by size

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