The object was launched from an area in North Korea’s western region, the South’s Office of the Joint Chiefs of Staff said in a short statement. It did not provide further details.
Earlier, the country’s Yonhap news agency reported in a short dispatch that the North had fired a ballistic missile.
North Korean leader Kim Jong Un said in his New Year speech that the country was close to test-launching an intercontinental ballistic missile (ICBM) and state media have said such a launch could come at any time.
That prompted a vow of an “overwhelming” response from U.S. Defense Secretary James Mattis when he traveled to South Korea earlier this month.
North Korea has conducted two nuclear tests and a number of missile-related tests at an unprecedented rate since early last year and was seen by experts and officials to be making progress in its weapons capabilities.