Rockot (launch vehicle)

Rockot (launch vehicle)
Name	Rokot
Caption	Rokot on pad during preparation
Function	Small orbital launch vehicle
Manufacturer	Khrunichev State Research and Production Space Center
Country origin	Russia
Height	29.0 m
Diameter	2.5 m
Mass	107000 kg
Stages	2+ (Breeze-KM upper stage)
Status	Retired
First launch	1990-05-20
Last launch	2019-12-26
Launches	31
Successes	28

Rockot (launch vehicle)

Rokot was a Russian space launch vehicle derived from the UR-100N intercontinental ballistic missile, adapted for orbital launches with a Breeze-KM upper stage. Developed and manufactured by the Khrunichev State Research and Production Space Center with launch services provided by entities such as Eurockot Launch Services and launched from sites including Plesetsk Cosmodrome and Baikonur Cosmodrome. It served principally for placing small to medium payloads into low Earth orbit and for deploying satellites for customers like European Space Agency, Roscosmos, and commercial operators.

Development and design

The Rokot conversion program began after the end of the Cold War when decommissioned UR-100N silos and assets became available under arms reduction agreements such as the Strategic Arms Reduction Treaty. Khrunichev modified the two-stage missile, replacing the warhead section with a dedicated payload fairing and integrating the Russian-built Breeze-KM upper stage developed by Lavochkin Association to provide precise orbital insertion capability. The project involved coordination with commercial launch consortiums including Eurockot Launch Services—a partnership between Khrunichev and Arianespace affiliates—and relied on infrastructure at Plesetsk for cold-launch procedures and at Baikonur when required. Design choices emphasized reusability of heritage solid- and liquid-propellant technologies from the Soviet-era tactical and strategic programs, while meeting civil and commercial requirements influenced by customers such as EUMETSAT, SES S.A., and national space agencies.

Technical specifications

Rokot's first two stages retained the original UR-100N's storable liquid-propellant engines using unsymmetrical dimethylhydrazine and mixed oxides of nitrogen, producing a launch mass around 107,000 kg and a height near 29.0 m with a 2.5 m core diameter. The Breeze-KM upper stage provided restartable ullage motors, precise guidance, and a payload capacity to sun-synchronous and low Earth orbits typically in the 1,500–2,500 kg range depending on target inclination and altitude. Avionics originated from Soviet flight-control heritage upgraded with modern navigation and telemetry compatible with GLONASS and inertial measurement units comparable to those used by Proton-M and Soyuz-U. The payload fairing accommodated multiple satellite adapters enabling rideshare deployments akin to missions flown by Rockot competitors and complementary platforms such as Dnepr and Rokot-era commercial aggregates.

Launch history

Rokot's maiden flight drew on converted ICBM stockpiles and launched in 1990 from Plesetsk; subsequent commercial operations accelerated in the 2000s after formation of Eurockot. Over its operational life Rokot flew approximately 31 missions with around 28 successes and 3 failures, supporting military, civil, and commercial payloads. Notable missions included deployments for European Space Agency projects, polar-orbiting meteorological satellites for EUMETSAT, and commercial telecommunications satellites for companies such as Inmarsat and SES S.A.. Launch cadence fluctuated with geopolitical conditions, export controls like those influenced by Wassenaar Arrangement considerations, and supply of decommissioned UR-100N boosters from Russian strategic forces.

Payloads and mission types

Rokot carried a range of payloads including low Earth orbit satellites for remote sensing operators like CryoSat-2 partners, scientific spacecraft for institutions such as Max Planck Institute groups, navigation demonstrators, technology demonstration payloads, and commercial telecommunications satellites. It supported multi-satellite rideshare missions using dispensers compatible with small satellite standards similar to those used by CubeSat deployers and carried piggyback payloads for research centers including DLR and academic institutions. Rokot's orbital profiles favored sun-synchronous polar insertions, low-inclination insertions for Russian military customers, and tailored insertion sequences for constellation deployment campaigns akin to those of contemporary small-launch services.

Operators and manufacturing

Khrunichev was the primary manufacturer and developer, with operational launches conducted by Roscosmos-affiliated launch service groups and commercialized by Eurockot Launch Services, which handled marketing, customer interfaces, and international export compliance. Launch operations relied on facilities and personnel from Plesetsk Cosmodrome managed by the Russian Space Forces elements and, for a time, interoperated with logistics and range services at Baikonur Cosmodrome in cooperation with Kazakhstan. International customers interfaced through Eurockot agreements that navigated export control regimes involving agencies such as European Commission bodies and multilateral frameworks.

Retirement and legacy

Rokot was retired in the late 2010s as a result of depletion of UR-100N missile stocks, evolving launch market demands, and the emergence of newer small- and medium-class launchers such as Soyuz-2, Rockot alternatives, and commercial entrants that offered greater payload capacity or lower cost per kilogram. Its legacy includes demonstrating effective conversion of strategic missiles to peaceful space use, contributing to European‑Russian commercial launch cooperation, and deploying numerous scientific and operational satellites that advanced programs at ESA, EUMETSAT, and various research institutes. Components of Rokot heritage influenced design choices in later Khrunichev projects and informed policy discussions on demilitarization of delivery systems under treaties like START and subsequent arms-reduction dialogues.

Category:Russian rockets