HMAS Sirius at sea
Commanding Officer
Role Combat Logistics
O 266
International Callsign
To Serve and Provide
Home Port
Hyundai Mipo Dockyard
16 September 2006
Dimensions & Displacement
Displacement 25016.53 tonnes (46755 tonnes full load)
Length 191.3 metres
Beam 32 metres
Draught 11 metres
Speed 16 knots
Range 16000 nautical miles
Crew 60
Machinery 1 Hyundai B&W 6S 50MC diesel
Guns 5 x 12.7 mm machine guns
Radars 2 Sperry Marine Bridgemaster
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HMAS Sirius ships badge

The Royal Australian Navy's afloat support capability is provided by the underway replenishment ships HMAS Sirius and HMAS Success (II). The Afloat Support Force provides operational support for the rest of the fleet by providing fuel, stores and ammunition, thus significantly extending the RAN's operational reach and endurance at sea. It can also provide limited support to deployed Army and Air Force units.

HMAS Sirius was built as a double-hulled commercial product tanker, MV Delos and purchased by the Commonwealth Government on 3 June 2004. Named Sirius, the ship underwent modification for underway replenishment. In addition, a flight deck was fitted for helicopter operations.

The ship can carry over 34,806 cz (cubic metres) of fuel including 5,486 cz (cubic metres) of aviation fuel for use by RAN helicopters. Sirius can replenish ships at sea by day and night, and is capable of replenishing two ships at a time. She has transfer points for fuel, water and stores.

Sirius is the first RAN ship to carry this name, however HMS Sirius (I) was commissioned into the Royal Navy in 1780 as the flagship of the 'First Fleet'. The name was selected because of its historical connections with the First Fleet and the import role the ship played in providing logistic support to the struggling economy. Her motto is "to serve and provide".