View of the triple crater in Terra Sirenum
View of the triple crater in Terra Sirenum
This depression, approximately 45 kilometres long and 24 kilometres wide, in the right half of the image, consists of three superposed impact craters. The triple crater was very likely formed by a single impactor that broke up into three parts prior to impact.
The triple crater is characterised by multi-layered ejecta deposits. To form this, the impact with the surface must have been at a low angle and ground ice must have existed in the subsoil that was liquefied or vapourised during the impact and combined with the local rock to form a muddy ejecta mass.
North is to the right in the image.