P-70 Ametist

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P-70 Ametist
(NATO reporting name: SS-N-7 'Starbright')
P-70 Ametist.svg
TypeAnti-shipping missile
Place of originSoviet Union
Service history
In service1968-1995
Used bySoviet Union, Russia, India
Production history
Manufacturer NPO Mashinostroyeniye (Chelomei)
Mass7,700 lb (3,500 kg)
Length23.0 ft (7.0 m)
Warhead high explosive or 200 kiloton nuclear
Warhead weight1,170 lb (530 kg)

PropellantSolid fuel
65 km (35 nmi)
Maximum speed Mach 0.9
Inertial guidance, terminal active radar homing
Charlie-I & Papa classes SSGNs

The P-70 Ametist (NATO reporting name SS-N-7 Starbright, GRAU designation 4K66; Russian : П-70 «Аметист» 'Amethyst') was an anti-ship missile carried by Soviet and Indian Project 670 submarines, as well as the Soviet Project 661 Anchar. It was soon succeeded by the P-120 Malakhit (SS-N-9 'Siren').



The P-5 Pyatyorka (SS-N-3 Shaddock) missile required the Project 659 submarines carrying them to spend 30 minutes or more on the surface when firing. This made submarines very vulnerable to enemy attack, so in the 1960s the Soviets started work on a new missile that could be fired whilst submerged, and a submarine to carry it. These became the P-120 Malakhit and Project 670 submarine.

However, problems with the engines of the P-120 Malakhit forced the Soviets to design a sub-launched missile based on the P-15M Termit (SS-N-2C 'Styx') as a stopgap measure for the first batch of Charlie submarines. This became the P-20L, later renamed the P-70 Ametist.


The P-15M was fitted with an L band active radar homing sensor and a new radar altimeter both developed for the P-120, but there was no room for a datalink in the smaller P-15M. Folding wings were added to reduce the size of the missile, and the missile can be launched at a maximum depth of 30 m (98 ft).

The short range of the P-70 meant it did not need mid-course updates from a radar on the submarine, so it could be fired submerged. This more than made up for its lack of range compared to the P-5.

Operational history

The P-70 went into service with the Soviet Navy on the first Project 670, on June 3, 1968. [1] About 200 were produced.

India leased the Chakra, a Soviet Project 670 submarine from January 1988 to 1992, to gain experience of operating a nuclear submarine.


Flag of the Soviet Union.svg  Soviet Union
Flag of Russia.svg  Russia
Flag of India.svg  India
Flag of North Korea.svg  North Korea

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  1. "P-70 Ametist" (in Russian). Archived from the original on 2011-07-09. Retrieved 2007-01-06.