Atago-class Ship Brief

The Atago-class destroyers are a class of guided-missile destroyers operated by the Japan Maritime Self-Defense Force (JMSDF). They are a highly advanced evolution of the earlier Kongo-class destroyers and are optimized for air defense and fleet escort roles.

General Characteristics

• Displacement: Approximately 10,000 tons (full load)

• Length: 165 meters

• Beam: 21 meters

• Draft: 6.2 meters

• Propulsion:

  • Combined Gas and Gas (COGAG) system

  • 4 General Electric LM2500-30 gas turbines

  • Total output: 100,000 shp

  • Speed: 30+ knots

Key Features

• Aegis Combat System:

  • Equipped with the AN/SPY-1D(V) phased-array radar.

  • Provides advanced multi-target tracking and ballistic missile defense (BMD) capabilities.

• Weapon Systems:

  • Vertical Launch System (VLS):

    • 96 cells capable of launching a variety of missiles, including:

      • Standard Missile 2 (SM-2) for air defense

      • Standard Missile 3 (SM-3) for BMD

      • RUM-139 VL-ASROC for anti-submarine warfare

    • Future compatibility with SM-6 missiles.

  • Anti-Ship Missiles:

    • Type 90 (SSM-1B) surface-to-surface missiles.

  • Gun Systems:

    • One 127mm/54-caliber Mk 45 Mod 4 naval gun.

    • Two 20mm Phalanx CIWS for close-in defense.

  • Torpedoes:

    • Type 68 triple torpedo tubes.

• Electronic Warfare and Countermeasures:

  • Advanced electronic support measures (ESM).

  • Chaff and decoy launchers.

• Sensors and Sonar:

  • AN/SQS-53C hull-mounted sonar.

  • AN/SQR-19 tactical towed-array sonar.

• Aviation Capabilities:

  • Hangar and flight deck capable of supporting one SH-60K Seahawk helicopter.

Role and Capabilities

The Atago-class destroyers are designed primarily for air and missile defense, with a secondary focus on anti-submarine and surface warfare. They play a critical role in Japan's layered defense strategy and are central to its ballistic missile defense network. The integration of the Aegis system makes them capable of intercepting both conventional and ballistic missile threats, while their sensor suite allows them to operate as command ships in fleet operations.

Currently, two ships in the class are active:

• JS Atago (DDG-177)

• JS Ashigara (DDG-178)

The Atago-class represents a cornerstone of Japan’s modern naval strategy, emphasizing interoperability with U.S. forces and regional maritime security operations.