CSO The body-Centered Solar Orbital frames for the Rosetta primary target comet
67P/Churyumov-Gerasimenko, incidental target comet 45P/Honda-Mrkos-Pajdusakowa
(Rosetta passed through its ion tail in July 2006), and
secondary targets asteroids 2867/STEINS and 21/LUTETIA are named
'67P/C-G_CSO', '45P/H-M-P_CSO', '2867/STEINS_CSO', and '21/LUTETIA_CSO'.
These frames are defined as a two-vector style dynamic frames as follows:

-  The position of the sun relative to the body is the primary
   vector: the X axis points from the body to the sun.

-  The inertially referenced velocity of the sun relative to the
   body is the secondary vector: the Y axis is the component of
   this velocity vector orthogonal to the X axis.

-  The Z axis is X cross Y, completing the right-handed reference
   frame.

-  All vectors are geometric: no aberration corrections are used.

• CSEQ The body-Centered Solar EQuatorial frames for the Rosetta
  primary target comet 67P/Churyumov-Gerasimenko and secondary target
  asteroid 21/LUTETIA are named '67P/C-G_CSEQ' and '21/LUTETIA_CSEQ'.
  These frames are defined as a two-vector style dynamic frames as
  follows:

  • +X axis is the position of the Sun relative to the body; it's
    the primary vector and points from the body to the Sun;

  • +Z axis is the component of the Sun's north pole of date
    orthogonal to the +X axis;

  • +Y axis completes the right-handed reference frame;

  • the origin of this frame is the body's center of mass.

All the vectors are geometric: no aberration corrections are used.

• C_G-CK C_G comet fixed frame (CK frame)

  A body-fixed frame is defined using standard
  body-fixed, CK-based frame formation rules:

  • +Z axis is toward the North pole;

  • +X axis is toward the prime meridian;

  • +Y axis completes the right hand frame;

  • the origin of this frame is at the center of the body.

The orientation of this frame is computed by evaluating
corresponding C_G comet attitudes kernels.