Sydney Chowder Bay Navy Fuel Wharf. 5 November 2016.
Vessel at 33°50'25.61" S 151°15'21.30" E

HMAS Sirius (O 266) (formerly MT Delos) is a commercial tanker purchased by the Royal Australian Navy and converted into a fleet replenishment vessel. Launched in South Korea on 2004, and converted in Western Australia, Sirius was commissioned in 2006; three years before a purpose-built vessel would have, and at half the cost. The tanker is expected to remain in service until the 2020s.

Details from http://www.navy.gov.au/hmas-sirius
Type Support Ship, Role Combat Logistics
Pennant O 266, Home Port Fleet Base West
Builder Hyundai Mipo Dockyard, Commissioned 16 September 2006
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
Complement Crew 60
Propulsion Machinery 1 Hyundai B&W 6S 50MC diesel
Armament Guns 5 x 12.7 mm machine guns
Radars 2 Sperry Marine Bridgemaster

Equasis data :
IMO number : 9283772 ... Name of ship : SIRIUS (since 01/09/2006)
Gross tonnage : 25382 (since 01/09/2006) ... DWT : 37432
Type of ship : Oil Products Tanker (since 01/09/2006) ... Year of build : 2004 ... Flag : Australia (since 01/07/2004