 Kerberos has a double-lobed shape and is approximately across its longest dimension and across its shortest dimension.The larger lobe of Kerberos is approximately 8 km (5 mi) across while the smaller lobe is measured to be approximately across.The double-lobed shape of Kerberos is likely formed by two smaller objects merged, suggesting that Kerberos along with Pluto's other moons may have been formed by the coalescence of debris around Pluto.