SBS 2 (satellite)

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SBS 2
Mission type Communications
Operator SBS
COSPAR ID 1981-096A
SATCAT no. 12855
Mission duration 7 years design life
Spacecraft properties
Bus HS-376
Manufacturer Hughes Space and Communications
Launch mass 550 kilograms (1,210 lb)
Start of mission
Launch date 24 September 1981, 23:09 (1981-09-24UTC23:09Z) UTC
Rocket Delta-3910 PAM-D
Launch site Cape Canaveral LC-17A
Contractor NASA
End of mission
Disposal Decommissioned
Deactivated September 1996 (1996-10)
Orbital parameters
Reference system Geocentric
Regime Geostationary
Longitude 117° W [1]
Eccentricity 0.73679
Perigee 166 kilometres (103 mi)
Apogee 36,830 kilometres (22,890 mi)
Inclination 27.7°
Period 650.8 minutes
Epoch September 24, 1981
Transponders
Band 14  Ku band

SBS 2 was a geostationary communications satellite designed and manufactured by Hughes (now Boeing) on the HS-376 platform. It was ordered by Satellite Business Systems, which later sold it to Hughes Communications. It had a Ku band payload and operated on the 117°W longitude. [2]

Geostationary orbit circular orbit above the Earths equator and following the direction of the Earths rotation

A geostationary orbit, often referred to as a geosynchronous equatorial orbit (GEO), is a circular geosynchronous orbit 35,786 km (22,236 mi) above Earth's equator and following the direction of Earth's rotation. An object in such an orbit appears motionless, at a fixed position in the sky, to ground observers. Communications satellites and weather satellites are often placed in geostationary orbits, so that the satellite antennae that communicate with them do not have to rotate to track them, but can be pointed permanently at the position in the sky where the satellites are located. Using this characteristic, ocean-color monitoring satellites with visible and near-infrared light sensors can also be operated in geostationary orbit in order to monitor sensitive changes of ocean environments.

Communications satellite artificial satellite sent to space for the purpose of telecommunications

A communications satellite is an artificial satellite that relays and amplifies radio telecommunications signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth. Communications satellites are used for television, telephone, radio, internet, and military applications. There are 2,134 communications satellites in Earth’s orbit, used by both private and government organizations. Many are in geostationary orbit 22,200 miles (35,700 km) above the equator, so that the satellite appears stationary at the same point in the sky, so the satellite dish antennas of ground stations can be aimed permanently at that spot and do not have to move to track it.

The Boeing Satellite Development Center is a major business unit of Boeing Defense, Space & Security. It brought together Boeing satellite operations with that of GM Hughes Electronics' Space and Communications division in El Segundo, California.

Contents

Satellite description

The spacecraft was designed and manufactured by Hughes on the HS-376 satellite bus. It had a launch mass of 550 kg (1,210 lb), a geostationary orbit and a 7-year design life. [3]

The Boeing 376 is a communications satellite bus introduced in 1978 by Hughes Space and Communications Company. It was a spin-stabilized bus that the manufacturer claims was the first standardized platform.

Satellite bus general model on which multiple-production satellite spacecraft are often based; infrastructure of a spacecraft, usually providing locations for the payload (typically space experiments or instruments); service module section of a satellite

A satellite bus or spacecraft bus is a general model on which multiple-production satellite spacecraft are often based. The bus is the infrastructure of the spacecraft, usually providing locations for the payload.

History

On September 24, 1981, SDS 2 was finally launched by a Delta-3910 PAM-D from Cape Canaveral at 23:09  UTC.

Delta (rocket family) rocket family

Delta is an American versatile family of expendable launch systems that has provided space launch capability in the United States since 1960. There have been more than 300 Delta rockets launched, with a 95% success rate. Only the Delta IV remains in use as of 2018. Delta rockets are currently manufactured and launched by the United Launch Alliance.

Cape Canaveral Air Force Station spaceport on Cape Canaveral, USA

Cape Canaveral Air Force Station (CCAFS) is an installation of the United States Air Force Space Command's 45th Space Wing.

In April 1996, SDS 2 finally decommissioned and put on a graveyard orbit. [2]

Graveyard orbit supersynchronous orbit where spacecraft are intentionally placed at the end of their operational life

A graveyard orbit, also called a junk orbit or disposal orbit, is an orbit that lies away from common operational orbits. One significant graveyard orbit is a supersynchronous orbit well above geosynchronous orbit. Satellites are typically moved into such orbits at the end of their operational life to reduce the probability of colliding with operational spacecraft and generating space debris.

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References

  1. ↑ "SBS 2". n2yo.com. Retrieved 2017-04-29.
  2. 1 2 Krebs, Gunter Dirk. "SBS 1, 2, 3, 4, 5 / HGS 5 - Gunter's Space Page". Gunter's Space Page. Retrieved 2017-04-29.
  3. ↑ "SBS 2". NASA Space Science Data Coordinated Archive. Retrieved 2017-04-29.

See also


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