(278361) 2007 JJ43
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| 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 (120801 d) |
| Mean anomaly | 331.84° |
| Inclination | 12.0623° |
| Longitude of ascending node | 272.493° |
| Argument of perihelion | 9.02° |
| Physical characteristics | |
| Dimensions |
610 km (0.10 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
- ↑ 1.0 1.1 1.2 JPL Small-Body Database Browser: 2007 JJ43 Retrieved: 2011-06-18
- ↑ 2.0 2.1 Wm. Robert Johnston (20 August 2011). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 2012-02-03.
- ↑ 3.0 3.1 AstDys 2007 JJ43 Summary Retrieved: 2012-02-03
- ↑ 4.0 4.1 Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. Retrieved 2011-08-25.
- ↑ 5.0 5.1 "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)
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