2006 QH181 - 19th Largest TNO? 5th Largest SDO ?

2006 QH181 is a large trans-Neptunian object. 2006 QH181 is possibly the 19th largest TNO and 5th largest SDO currently known.

Discovery

2006 QH181 was discovered on August 21, 2006. The discover was not known.

Stats

Estimated Diameter: 677 km (460 - 1030 km)
Aphelion: 97.02 AU
Perihelion: 38.24 AU
Semi-major axis: 67.71 AU
Orbital Period: 557.16 years
Rotation period: ?
Date discovered: 2006.8.21
Classification: TNO, SDO, 1:5 resonance?

Orbit

2006 QH181 came to perihelion around 1859. 2006 QH181 is currently 82.7 AU from the Sun. The only dwarf-planet-type bodies currently further from the Sun are Eris (96 AU), Sedna (87 AU) and 2007 OR10 (86 AU). Being so far from the Sun, it only has an apparent magnitude of 23.

2006 QH181 has been observed 10 times over only 2 oppositions and thus currently has a poorly known orbit. JPL ranks orbital quality from 0 to 9 (0 being best), and 2006 QH181 is currently listed with a poor orbital quality of 8.

2006 QH181 could be part of the scattered disc. 2006 QH181 may be a detached object since a perihelion of 38.24 AU may place it outside of the direct influence of Neptune, or it could have a 5:1 resonance with Neptune. Further observations of the orbit will be required.

How big is it?

2006 QH181 is so far away in the outer solar system that we don't know for sure how large it is. Because all we see is a dot of light, which is sunlight reflected off the surface of the TNO. But we don't know if the object is bright because it is large or if it is bright because it is highly reflective or both.

Dwarf-planet candidate

Mike Brown lists 2006 QH181 as highly likely dwarf planet.