Deployment: KH-09-5

The first three legs of the R/V Hakuho Maru KH-09-5 cruise, whose schedules are shown below, were successfully conducted by Ocean Research Institute, the University of Tokyo, and Japan Agency for Marine-Earth Science and Technology (JAMSTEC), from 6 November 2009 to 10 January 2010 (66 days in total) in the north and western Indian Ocean including the Antarctic Sea. The three legs of this cruise were nicknamed "ERIDANUS Expedition".

Leg-1: Tokyo, Japan (6 Nov. 2009) to Cochin, India (24 Nov. 2009)
Leg-2: Cochin, India (27 Nov. 2009) to Port Louis, Mauritius (16 Dec. 2009)
Leg-3: Port Louis, Mauritius (16 Dec. 2009) to Cape Town, South Africa (10 Jan. 2010)

In the original plan, this cruise should have been completed a year earlier (from Nov. 2008 to Jan. 2009), but the cruise was postponed as above due to the rapid increase of oil price at the beginning of FY2008. This cruise was internationally authorized as the first GEOTRACES meridional study in the Indian Ocean.