Thaicom 5

Thaicom 5 was a geostationary communications satellite operated by Thaicom. It was used to provide communications services to Asia, Africa, Middle East, Americas, Europe and Australia.^[3]

THAICOM 5

Mission type	Communication
Operator	Thaicom
COSPAR ID	2006-020B
SATCAT no.	29163
Mission duration	12 years (planned)
Spacecraft properties
Bus	Spacebus 3000A
Manufacturer	Alcatel Alenia Space
Launch mass	2,800 kilograms (6,200 lb)
Start of mission
Launch date	27 May 2006, 21:09 (2006-05-27UTC21:09Z) UTC
Rocket	Ariane 5ECA
Launch site	Kourou ELA-3
Contractor	Arianespace
End of mission
Disposal	Decommissioned
Deactivated	26 February 2020, 09:52 (2020-02-26UTC09:53Z) UTC[1]
Orbital parameters
Reference system	Geocentric
Regime	Geostationary now graveyard orbit
Longitude	78.5° East
Perigee altitude	35,777 kilometres (22,231 mi)
Apogee altitude	35,796 kilometres (22,243 mi)
Inclination	0 degrees
Period	24 hours
Epoch	27 May 2006, 17:09:00 UTC[2]
Transponders
Band	25 C band 14 Ku band

Overview

Thaicom 5 was constructed by Alcatel Alenia Space, and is based on the Spacebus 3000A satellite bus, with a configuration identical to the Thaicom 3 satellite which it replaced. It was originally ordered as Thaicom 4, but sold to Agrani as Agrani 2 before completion. It was completed in 1997, and stored until June 2005 when it was cancelled and sold back to Thaicom. It was equipped with 25 G/H band (IEEE C band) and 14 J band (IEEE K_u band) transponders, and at launch it had a mass of 2,800 kilograms (6,200 lb), with an expected operational lifespan of 12 years.^[4][5]

Thaicom 5 began experiencing technical difficulties in December 2019, causing Thaicom to duplicate some channels, including Korean Central Television, to neighboring satellites.^[6]

Launch

The satellite was launched on an Ariane 5ECA carrier rocket, contracted by Arianespace, flying from ELA-3 at the Guiana Space Centre. The launch occurred at 21:09 UTC on 27 May 2006, and placed Thaicom 5, along with the Mexican Satmex 6 spacecraft, into geosynchronous transfer orbit.^[7] At the time, it was the heaviest dual-satellite payload ever launched into geosynchronous transfer orbit,^[8] however, this record has since been broken.

Following launch, Thaicom 5 raised itself into geostationary orbit using an S400 engine, with insertion occurring on 3 June 2006.^[9] It underwent on-orbit testing, and was positioned at a longitude of 78.5° East for operational service, where it replaced the failing Thaicom 3 satellite.^[3] On 2 October 2006, after Thaicom 5 had become operational, Thaicom 3 was moved to a graveyard orbit.

See also

• Spaceflight portal

• Thaicom 4
• Thaicom 6
• Thaicom 8