Table 2.5 The regional classification of 67P
Region
Rough.
index
Characteristics and area [km
2
]
Atum
(Am)
17.09
Complex region with consolidated
material and very rough.
1.9497
Sub-region a
A very rough topographic high
(with respect to its surroundings)
with boulders and some
lineaments.
Sub-region b
A smooth fractured surface
adjoining Khonsu. On the Khonsu
side, there is a cliff leading to
rough fractured terrains possibly
indicating loss of this smooth
layer. It is topographically at
slightly higher elevation than the
adjoining Anubis region with a
distinct step evident at the
boundary.
Sub-region c
An undulating terrain with intermediate roughness. It is bounded
by Anubis and Anhur on the north
and south side respectively and by
a steep cliff to the east that forms
the Geb region.
Khonsu
(Kn)
18.83
Complex region with a mixture of
smooth and rough terrains.
2.16872
Sub-region a
This sub-region is at an angle with
respect to the rest of the region. It
also contains small scale roughness
and a lot of boulders.
Sub-region b
Very rough terrain on many scales
adjoining the Apis “face” and
showing the side of the rougher
part of Atum.
Sub-region c
Very rough and in places pitted
terrain with fractures. Topographically low compared to adjacent
Atum sub-regions.
Sub-region d
Adjoining Atum, this region is
very complex. There are flatter
areas (dust deposits) but with
rough outcrops.
Sub-region e
A small sub-region which is dominated by flat, apparently dusty
material
Apis (Ap) 12.77
Consolidated and fractured but
topographically smooth. Topographically stands out above Ash
0.39798
(continued)
86
2 The Nucleus