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The first Polaris submarine outfitted with MRV A-3's was the USS Daniel Webster in 1964. [21] Later the Polaris A-3 missiles (but not the ReBs) were also given limited hardening to protect the missile electronics against nuclear electromagnetic pulse effects while in the boost phase. This was known as the A-3T ("Topsy") and was the final ...
The United Kingdom's Polaris programme, officially named the British Naval Ballistic Missile System, provided its first submarine-based nuclear weapons system. Polaris was in service from 1968 to 1996. Polaris itself was an operational system of four Resolution-class ballistic missile submarines, each armed with 16 Polaris A-3 ballistic missiles.
The W47 was an American thermonuclear warhead used on the Polaris A-1 sub-launched ballistic missile system. Various models were in service from 1960 through the end of 1974. The warhead was developed by the Lawrence Radiation Laboratory between 1957 and 1960. [1]
The variability of Polaris had been suspected since 1852; this variation was confirmed by Ejnar Hertzsprung in 1911. [28] The range of brightness of Polaris is given as 1.86–2.13, [4] but the amplitude has changed since discovery. Prior to 1963, the amplitude was over 0.1 magnitude and was very gradually decreasing.
The short range of the early SLBMs dictated basing and deployment locations. By the late 1960s the UGM-27 Polaris A-3 missile was deployed on all US and UK ballistic missile submarines. Its range of 4,600 kilometres (2,500 nmi) was a great improvement on the 1,900-kilometre (1,000 nmi) range of Polaris A-1.
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