Sydney Harbour, Fleet Base East Garden Island. 8 March 2015.
Vessel at 33°51'49.08" S 151°13'27.20" E

Class: Canberra Class... Type Amphibious Assault Ship (LHD)... Role air-land-sea amphibious deployment
humanitarian assistance and disaster relief (HADR)
Pennant L02 ... Home Port Fleet Base East
Builder BAE Systems Australia and Navantia, Laid Down 23 September 2009, Launched 17 February 2011, Commissioned
28 November 2014
Displacement 27,831 tonnes (unloaded and not docked down), Length 230.8 metres (overall), 207.2 metres (waterline), Beam 32 metres, 29.5 metres (at waterline), Draught 7.18 metres (full load), 10 metres (docked down)
Flight Deck 202.3 metres (length), 32 metres (width), 4,750 square metres (area), 27.5 metres (height)
Speed 20+ knots (maximum), 19 knots (sustained maximum at full-load), 15 knots (economic cruising), up to 8 knots (reversing speed with full directional control),
Range: 6,000 nautical miles (at 20 knots), 9,250 nautical miles (at 15 knots), 45+ day endurance
Complement: Crew 358 (293 RAN, 62 Army, 3 RAAF), Embarked Forces 1,046
Capacity: 4 x LCM-1E landing craft, 110 vehicles, 12 Abrams main battle tanks
Guns 4 x Typhoon stabilised weapon systems with 25mm M242 Bushmaster chaingun and coaxially mounted M240 7.62mm machine gun
Helicopters 18 helicopters with 6 operating simultaneously from the flight deck

Information about jack up barge welcomed

Marine Traffic data
SEA LIFT 1
IMO: -
MMSI: 503011840... Call Sign: -
Flag: Australia (AU) ... AIS Type: Unspecified
Gross Tonnage: .... Deadweight: -
Length × Breadth: 18m × 11m.... Year Built: -.... Status: Active

Additional SEA LIFT 1 data, thanks to Cody, at
http://www.australianbargehire.com.au/uploads/4/3/8/6/4386443/specification_sl1.pdf