Sydney Harbour, approaching Garden Island Fleet Base East. 3 December 2015.
Vessel at 33°51'24.91" S 151°13'55.04" E

RAN web site data:
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,
Performance : 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

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.

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

Tugs: (stern) ELWING (bow) WAREE