Here someone decided his own:
http://www.warseer.com/forums/showthread.php?349345-BFG-Battlefleet-ScarusFound this as well:
Segmentae Majoris
OBSCURUS [OBS] — This segmentum lies to the galactic-north of Terra. Cut off by EOT. Segmentum headquarters is Cypra Mundi. The traditional color of Battlefleet Obscurus is red.
PACIFICUS [PAC] — This segmentum lies to the galactic-west of Terra. Segmentum the headquarters is Hydraphur. The traditional color of Battlefleet Pacificus is green.
SOLAR [SOL] — Holy Terra lies in this region. Segmentum headquarters is Mars. The traditional color of Battlefleet Solar is black.
TEMPESTUS [TEM] — This segmentum lies to the galactic-south of Terra. Segmentum headquarters is Bakka. The traditional color of Battlefleet Tewpestus is blue.
ULTIMA [ULT] — This segmentum lies to the galactic-east of Terra. Contains the galactic gore systems and is by far the largest segmentum. Segmentum headquarters is Kar Duniash. The traditional color of Battlefleet Ultima is grey.
But that is not sufficient.