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Discovery[1]
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| Discovered by | Palomar Observatory |
| Discovery date | 14 May 2007 |
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Designations
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| Alternate name(s) | 2007 JJ43 |
| Minor planet category |
TNO |
| 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° |
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Physical characteristics
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| Dimensions | ~1000 km[3] |
| Rotation period | ? d |
| Apparent magnitude | 20.69 [2] |
| Absolute magnitude (H) | 3.7[1] or 4.4[2] |
(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 in telescopes, it is thought likely to be a plutoid (a dwarf planet), but is not yet formally recognized as such by the International Astronomical Union.
Its discovery images were taken in 2007. Its absolute magnitude of 3.7 is one of the twenty brightest exhibited by TNOs. Assuming it has a typical albedo, this would make it roughly the same size as 28978 Ixion (~650–800 km diameter). However, Johnston's Archive placed it at about 1000 km in diameter in 2010;[3] slightly larger than 1 Ceres (~950 km diameter).
2007 JJ43 is about 48 AU away from the Sun in 2010, ranging from 40 to 56 AU over its expected orbit.[3]
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