11 Parthenope
In 2007, Baer and Chesley discovered that it is of 6.3 kg. It had a density of 3.3 g/cm3. In 2008, it was found that it could have a mass of 6.15 instead. In 1997 and 2001, it was thought that that it was 5 kg and had a density 2.7 g/cm3.