Passage: On 12 December, the Japanese Navy proposed that Guadalcanal be abandoned. At the same time, several army staff officers at the Imperial General Headquarters (IGH) also suggested that further efforts to retake Guadalcanal would be impossible. A delegation, led by IJA Colonel Joichiro Sanada, chief of the IGH's operations section, visited Rabaul on 19 December and consulted Imamura and his staff. Upon the delegation's return to Tokyo, Sanada recommended that Guadalcanal be abandoned. The IGH's top leaders agreed with Sanada's recommendation on 26 December and ordered their staffs to begin drafting plans for a withdrawal from Guadalcanal, establishment of a new defense line in the central Solomons, and a shifting of priorities and resources to the campaign in New Guinea.On 28 December, General Hajime Sugiyama and Admiral Osami Nagano personally informed Emperor Hirohito of the decision to withdraw from Guadalcanal. On 31 December, the Emperor formally endorsed the decision. The Japanese secretly began to prepare for the evacuation, called Operation Ke, scheduled to begin during the latter part of January 1943.

Question: What year did Operation Ke take place?
1943