Planet or Planetoid?

Caption NASA:"The oblate shape of the moon Japetus is particularly noticeable in this portrait.
The two-toned surface of the moon Japetus also stands out against the darkness of space in this image.

This view looks toward the Saturn-facing Side of Japetus. North is up and rotated 26° to the left.

Scale in the original image was about 22 Km (approx. 14 miles) per pixel.
The image was contrast enhanced and magnified by a factor of three to enhance the visibility of surface features.
The image was taken in Visible Light with the Cassini Spacecraft narrow-angle camera on Dec. 16, 2009. The view was acquired at a distance of approx. 3,6 MKM (about 2,2 MMs) from Japetus and at a Sun-Japetus-Spacecraft, or Phase, Angle of 27°".