More bodies have been proposed, such as Salacia and (307261) 2002 MS 4 by Brown; Varuna and Ixion by Tancredi et al., and (532037) 2013 FY 27 by Sheppard et al. Most of the larger bodies have moons, which enables a determination of their mass and thus their density, which inform estimates of whether they could be dwarf planets. The largest TNOs that are not known to have moons are Sedna, (307261) 2002 MS 4, (55565) 2002 AW 197 and Ixion. In particular, Salacia has a known mass and diameter, putting it as a borderline case by the IAU's 2006 Q&A.