Sydney Harbour, Fleet Base East Garden Island. 22 March 2018.
Annual visit after tour of duty in Antarctica.
Vessel at 33°51'55.46" S 151°13'25.19" E

Wikipedia data :

Shirase (しらせ) (Hull number: AGB-5003) is a Japanese icebreaker operated by the Japan Maritime Self-Defense Force and Japan's fourth icebreaker for Antarctic expeditions. Her predecessor (AGB-5002) had the same name

Like its predecessor it makes one single long voyage each season from Japan via Fremantle to the Japanese Antarctic Bases of Syowa (established 1957), Mizuho (est. 1970) and Asuka (est. 1985). It then returns to Japan via Sydney after a trip of around 6 months.

Displacement: Approx. 20,000 tons
Length: 138 m (452 ft 9 in)
Beam: 28 m (91 ft 10 in)
Draft: 9.2 m (30 ft 2 in)
Propulsion: Diesel-electric
Four propulsion motors, 22,000 kW (combined)
Two shafts; fixed-pitch propellers
Speed: 19.5 knots (36.1 km/h; 22.4 mph) (maximum)
3 knots (5.6 km/h; 3.5 mph) in 1.5 m (4.9 ft) ice
Capacity: 80 scientists
1,100 tons of cargo
Complement: 175
Aircraft carried: 3 helicopters

For background history see
http://www.globalsecurity.org/military/world/japan/shirase.htm