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Constellation Class Targeting Ship
From Warhammer 40k - Lexicanum

Constellation Class Targeting Ship[1]
The Constellation Class Targeting Ship is a support vessel of the Imperial Navy.[1]
Equipped with huge detection systems, the Constellation's domes house huge detection arrays which constantly sweep the void, combing for any detection of enemy ships. It's able to link up its systems with nearby Imperial warship. Once "online", the Constellation is able to channel its data with the fire control systems of its allies. This enables other Imperial vessels to detect enemy attacks at a greater range and target the enemy accurately long before they are in range of the foes guns. However it is a vulnerable vessel, as it has little offensive or defensive weaponry.[1]
Sources
- 1: White Dwarf 147 (UK) pg.6