sequence, after the onboard computer failed to check the launch azimuth. Fuelling of the rocket was underway at the time, and all launch complex equipment and on-board preliminary checks had proceeded without incident. The rocket was left fuelled on the launch pad, for the next attempt on 18 July 2006. Launch was eventually conducted on 19 October 2006. First crewed mission First crewed launch of Soyuz-2 took place at 9 April 2020, carrying Soyuz MS-16 to the ISS. Naphthyl fuel Following successful ground testing, a naphthyl fueled Soyuz-2.1b launch took place on 22 October 2022 at Vostochny. Naphthyl is an environmentally safe hydrocarbon fuel with fewer aromatic compounds than kerosene, that also slightly improves engine performance. There are only minor differences in thermal properties, viscosity, and surface tension, so this did not require significant engine changes. Launch statistics Since 2006, Soyuz-2 rockets have accumulated a total of 155 launches, 148 of which were successful, yielding a success rate. Launch outcomes Launch sites List of launches Planned launches See also Soyuz programme List of R-7 launches Medium-lift launch vehicle Notes References External links Encyclopedia Astronautica article on Soyuz 2.1 Encyclopedia Astronautica article on Soyuz 2.1/Fregat European Space Agency about Soyuz-ST (Russian name Soyuz-STK) Soyuz User's Manual, from Starsem Soyuz-2 launch vehicle, from Roscosmos R-7 (rocket family) Space launch vehicles of Russia Vehicles introduced in 2004