Variants
Soyuz-2 family includes 2.1a, 2.1b and 2.1v. The first two variants are modifications to the Soyuz-U launcher. The latter is a "light" version without side boosters.
When launched from ELS site, the Soyuz-2 will always be mated with ST-type fairing. This version will be called Soyuz-ST or Soyuz-STK, where additional "K" indicates special measures taken for preparing and launching the rocket in hot and humid conditions.
Read more about this topic: Soyuz-2 (rocket)
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