Intelsat 21 is a

communications satellite A communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a Transponder (satellite communications), transponder; it creates a communication channel between a source transmitter and a Rad ...

manufactured by Boeing Space Systems (BSS) for the Intelsat Corporation, based on the BSS-702MP

satellite bus A satellite bus (or spacecraft bus) is the main body and structural component of a satellite or spacecraft, in which the payload and all scientific instruments are held. Bus-derived satellites are less customized than specially-produced satelli ...

. It was launched on 19 August 2012 at 06:54:59

UTC Coordinated Universal Time (UTC) is the primary time standard globally used to regulate clocks and time. It establishes a reference for the current time, forming the basis for civil time and time zones. UTC facilitates international communica ...

by a

Zenit-3SL The Zenit-3SL was an expendable carrier rocket operated by Sea Launch. First flown in 1999, it was launched 36 times, with three failures and one partial failure. It was a member of the Zenit family of rockets, and is built by the Yuzhnoye Des ...

launch vehicle A launch vehicle is typically a rocket-powered vehicle designed to carry a payload (a crewed spacecraft or satellites) from Earth's surface or lower atmosphere to outer space. The most common form is the ballistic missile-shaped multistage ...

from a mobile platform in the equatorial

Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is ...

. and replaces the Intelsat 9 satellite at 58° West

Longitude Longitude (, ) is a geographic coordinate that specifies the east- west position of a point on the surface of the Earth, or another celestial body. It is an angular measurement, usually expressed in degrees and denoted by the Greek lett ...

References

{{Orbital launches in 2012 Intelsat satellites Satellites using the BSS-702 bus Communications satellites in geostationary orbit Spacecraft launched in 2012