(278361) 2007 JJ43

(268361) 2007 JJ43 is a trans-Neptunian object (TNO) orbiting the Sun near the outer edge of the Kuiper belt. If size estimates based on its absolute magnitude are correct, it is a possible dwarf planet.

(278361) 2007 JJ43
Discovery [1]
Discovered byPalomar Observatory
Discovery date14 May 2007
Designations
2007 JJ43
Orbital characteristics[4][1]
Epoch 27 August 2011 (JD 2455800.5)
Uncertainty parameter 2
Observation arc4813 days (13.18 yr)
Earliest precovery date10 May 2002 (NEAT)
Aphelion55.3707 AU
Perihelion40.2776 AU
47.82 AU
Eccentricity0.1578
330.74 a (120801 d)
331.84°
Inclination12.0623°
272.493°
9.02°
Physical characteristics
Mean diameter
610+170
−140 km (0.13 albedo, H=3.9)[5]
≈530 km (0.08 albedo, H=4.8)[6]
≈558 km (0.09 albedo, H=4.5)[2]
20.8 [7]

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). Michael Brown's website lists it as a "likely" dwarf planet.[6] 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]

See also

References
  1. JPL Small-Body Database Browser: 2007 JJ43 Retrieved: 2011-06-18
  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. 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. 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 2019-05-20. Retrieved 2019-08-13.
  7. "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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