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Eutelsat 33B
Names	Eutelsat 3 F-1; Eutelsat W1 (pre-launch); Eutelsat W5 (2002-2012); Eutelsat 70A (2012-2013); Eutelsat 25C (2013-2014); Eutelsat 33B (2014-2015)
Mission type	Communications
Operator	Eutelsat S.A.
COSPAR ID	2002-051A
SATCAT no.	27554
Website	https://www.eutelsat.com/en/home.html
Mission duration	12 years (planned); 13 years (achieved)
Spacecraft properties
Spacecraft	Eutelsat W5
Spacecraft type	Spacebus
Bus	Spacebus-3000B2
Manufacturer	Alcatel Space
Launch mass	3,170 kg (6,990 lb)
Dry mass	1,400 kg (3,100 lb)
Dimensions	4.6 m × 2.5 m × 1.8 m (15.1 ft × 8.2 ft × 5.9 ft); Span on orbit: 29 m (95 ft)
Power	5.9 kW
Start of mission
Launch date	20 November 2002, 22:39:00 UTC
Rocket	Delta 4M+(4,2) (s/n D293)
Launch site	Cape Canaveral, SLC-37B
Contractor	Boeing
Entered service	January 2003
End of mission
Disposal	Graveyard orbit
Deactivated	October 2015
Orbital parameters
Reference system	Geocentric orbit
Regime	Geostationary orbit
Transponders
Band	24 Ku-band
Bandwidth	72 MHz
Coverage area	Europe, Middle East, Asia
	Eutelsat constellation ← Hot Bird 6 Eutelsat W3A →

Eutelsat 33B, formerly known as Eutelsat 3F1, Eutelsat W1, Eutelsat W5, Eutelsat 70A and Eutelsat 25C, is a telecommunications satellite owned by Eutelsat Consortium.^[2] Eutelsat W5 provides coverage to Europe, Middle East, and Asia. The satellite can use either six steerable beams or two fixed beams to provide the coverage.

Satellite description

Eutelsat W1 was built by Aérospatiale and is a Spacebus-3000B2 satellite.^[2] The satellite measures 4.6 m × 2.5 m × 1.8 m (15.1 ft × 8.2 ft × 5.9 ft) and has a span of 29 m (95 ft) on orbit. Eutelsat W1 features three axis stabilization to help keep it stable and pointed at the Earth at all times. It features twenty-four K_u band transponders. It was used to provide video distribution and contribution links, occasional-use video as well as Internet backbone connections.^[3]

Eutelsat W5

The original Eutelsat W1 satellite was damaged during construction by a malfunctioning fire extinguishing system. During testing, when the factory where it was being built caught fire. The cause of the fire was determined to be a carbon fiber wall which got too hot when the antennas were pointed at it and turned up on full power. The satellite was covered in water causing extensive damage.^[2] It was declared a total loss, but was later reconstructed and completed as Eutelsat W5.^[4]

Eutelsat 70A

Eutelsat 70A was the first satellite to be launched by a Delta IV launch vehicle. The launch was originally scheduled for January 2001, but was delayed several times due to developmental problems with the Delta IV. On 27 March 2007, Eutelsat 70A began drifting west at a rate of 0.004° per day. It is not known why this began to happen.^[5] On 16 June 2008, a power generation anomaly occurred and four transponders were permanently lost. It was later revealed that one of the two solar panels was lost because the array's drive motor failed.^[2]

Eutelsat 25C

In 2013, it was replaced by Eutelsat 70B at 70° East ^[3] and was then moved to 25° East where it was renamed to Eutelsat 25C.^[6]

Eutelsat 33 B

In October 2015, Eutelsat 33B was deactivated because of the loss of its second solar panel.^[7]

References

^ "Launch Log". Jonathan's Space Report. 14 March 2021. Retrieved 20 April 2021.
^ ^a ^b ^c ^d "TSE - Eutelsat W5". The Satellite Encyclopedia. Retrieved 26 February 2010.
^ ^a ^b "W5 70.5°". Eutelsat.com. Archived from the original on 26 December 2012. Retrieved 26 February 2010.
^ "Eutelsat W5 → 70A → 25C → 33B". Gunter's Space Page. 21 July 2019. Retrieved 21 April 2021.
^ "Spacebus 3000". Astronautix. Archived from the original on 23 August 2002. Retrieved 26 February 2010.
^ "Eutelsat 25C". Eutelsat.com. Archived from the original on 31 May 2013. Retrieved 14 May 2013.
^ "CHIFFRE D'AFFAIRES DU PREMIER TRIMESTRE 2015-16. CROISSANCE DE 2,0% A TAUX DE CHANGE CONSTANT" [SALES OF THE FIRST QUARTER 2015-16. GROWTH OF 2.0% AT CONSTANT EXCHANGE RATE]. Archived from the original on 1 April 2016.