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(278361) 2007 Jj43

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(278361) 2007 Jj43

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 2455800.5)
Aphelion 55.3707 AU
Perihelion 40.2776 AU
Semi-major axis 47.82 AU
Eccentricity 0.1578
Orbital period 330.74 a (120,801 d)
Mean anomaly 331.84°
Inclination 12.0623°
Longitude of ascending node 272.493°
Argument of perihelion 9.02°
Physical characteristics
Dimensions 661 km (0.12 albedo)[4]
730 km (0.09 albedo)[2]
Apparent magnitude 20.8[5]
Absolute magnitude (H) 3.2[6] or 4.4[1][3]

(278361) 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 expected to be a dwarf planet.

Its discovery images were taken in 2007. 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 (≈650–800 km diameter). Mike Brown's website lists it as a highly likely dwarf planet,[4] but the diameter of the object has never been measured.

Observations by Mike Brown in 2012 using the W. M. Keck Observatory suggest that 2007 JJ43 does not have a companion.[7]

As of 2012, (278361) 2007 JJ43 is about 41.5 AU from the Sun.[5]

References

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