(278361) 2007 JJ43

(278361) 2007 JJ43
Discovery [1]
Discovered by Palomar Observatory
Discovery date 14 May 2007
Designations
2007 JJ43
TNO [1] · cubewano [2]
ScatNear[3]
Orbital characteristics[4][1]
Epoch 2011-08-27 0:00UTC (JD 2455800.5)
Aphelion 55.3707 AU
Perihelion 40.2776 AU
47.82 AU
Eccentricity 0.1578
330.74 a (120801 d)
331.84°
Inclination 12.0623°
272.493°
9.02°
Physical characteristics
Dimensions 610+170
−140 km (0.13 albedo, H=3.9)[5]
538 km (0.08 albedo)[6]
554 km (0.09 albedo)[2]
12.097 h[5]
6.04 hr?[1]
20.8 [7]
3.2 [8]
4.5 [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 4.5 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 530–620 km diameter). Micheal Brown's website lists it as a "highly likely" dwarf planet,[6] but its diameter has never been measured. In a paper in the Astrophysical Journal Letters András Pál and colleagues estimate a diameter for (278361) 2007 JJ43 of 610+170
−140 km.[5]

Observations by Brown in 2012, using the W. M. Keck Observatory, suggest that (278361) 2007 JJ43 does not have a companion.[9]

As of 2014, it is about 41.3 AU from the Sun.[7]

References

  1. 1 2 3 4 5 JPL Small-Body Database Browser: 2007 JJ43 Retrieved: 2011-06-18
  2. 1 2 Wm. Robert Johnston (20 August 2011). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 2012-02-03.
  3. ↑ Marc W. Buie. "Orbit Fit and Astrometric record for 278361". SwRI (Space Science Department). Retrieved 2018-02-18.
  4. ↑ AstDys 2007 JJ43 Summary Retrieved: 2012-02-03
  5. 1 2 3 Pál, A.; et al. (2015). "Pushing the Limits: K2 Observations of the Trans-Neptunian Objects 2002 GV31 and (278361) 2007 JJ43". The Astrophysical Journal Letters. 804 (2). L45. arXiv:1504.03671. Bibcode:2015ApJ...804L..45P. doi:10.1088/2041-8205/804/2/L45.
  6. 1 2 Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. Archived from the original on 2011-10-18. Retrieved 2011-08-25.
  7. 1 2 "AstDys 2007 JJ43 Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2012-02-03.
  8. ↑ A Southern Sky and Galactic Plane Survey for Bright Kuiper Belt Object
  9. ↑ 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)
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