Engineering:Galaxy 25

Short description: Communications satellite

Galaxy 25

Names	G-25 Intelsat Americas 5 IA-5 Telstar 5
Mission type	Communications
Operator	Loral Skynet (1997-2007) Intelsat (2007-)
COSPAR ID	1997-026A
SATCAT no.	24812
Website	https://www.intelsat.com
Mission duration	12 years (planned)
Spacecraft properties
Bus	LS-1300
Manufacturer	Space Systems/Loral
Launch mass	3,515 kg (7,749 lb)
Dry mass	1,469 kg (3,239 lb)
Start of mission
Launch date	24 May 1997, 17:00:00 UTC
Rocket	Proton-K / DM-04
Launch site	Baikonur, Site 81/23
Contractor	Khrunichev State Research and Production Space Center
Orbital parameters
Reference system	Geocentric orbit
Regime	Geostationary orbit
Longitude	97° West
Transponders
Band	52 transponders: 24 C-band 28 Ku-band
Bandwidth	36 MHz, 54 MHz, 27 MHz
Coverage area	Hawaii, Canada , United States , Mexico, Caribbean
Intelsat constellation

Galaxy 25 (G-25) launched in 1997, contracted by International Launch Services (ILS), formerly known as Intelsat Americas 5 (IA-5) until 15 February 2007 when it was renamed as result of the merger between owner Intelsat and PanAmSat for Telstar 5, is a medium-powered communications satellite formerly in a geostationary orbit at 97° West, above a point in the Pacific Ocean several hundred miles west of the Galapagos Islands. It was manufactured by Space Systems/Loral using its LS-1300 satellite bus and is currently owned and operated by Intelsat. The satellite's main C-band transponder cluster covers the United States , Canada , and Mexico; its main Ku-band transponder cluster covers the United States, Mexico, and the Northern Caribbean Sea. An additional C-band and a Ku-band transponder pair targets Hawaii.

Galaxy 25 has a projected life of 12 years. It was replaced by Galaxy 19 (formerly IA-9) in late 2008. When it was last in service at 97.1° West, Galaxy 25 transmitted both Free-to-air (FTA) direct-to-home (DTH) broadcasting and encrypted subscription channels / services. The replacement satellite, Galaxy 19 was successfully launched on September 24, 2008. Galaxy 25 has been moved to a different orbital position at 93.1° West where it is currently broadcasting several services on its K_u band transponders.

Technical details

Key Parameters
Total Transponders	C-Band:	24x36 MHz
	Ku-Band:	4x54 MHz, 24x27 MHz
Polarization	C-Band:	Linear - Horizontal or Vertical
	Ku-Band:	Linear - Horizontal or Vertical
e.i.r.p. (C-Band)		CONUS: 38.8 dBW Alaska: 33.7 dBW Caribbean: 34.3 dBW Hawaii: 33.8 dBW Mexico: 33.8 dBW Puerto Rico / United States Virgin Islands: 34.0 dBW Southern Canada: 37.0 dBW
e.i.r.p. (Ku-Band)		CONUS: 48.3 dBW Alaska: 40.9 dBW Caribbean: 43.4 dBW Hawaii: 46.4 dBW Mexico: 43.6 dBW Puerto Rico / United States Virgin Islands: 44.9 dBW Southern Canada: 44.3 dBW
Uplink Frequency	C-Band:	5925 to 6425 MHz
	Ku-Band:	14.00 to 14.50 GHz
Downlink Frequency	C-Band	3700 to 4200 MHz
	Ku-Band:	11.7 to 12.2 GHz
G/T (C-Band)		CONUS: -0.7 dB/K Alaska: -8.2 dB/K Caribbean: -4.7 dB/K Hawaii: -5.2 dB/K Mexico: -5.4 dB/K Puerto Rico / United States Virgin Islands: -4.6 dB/K Southern Canada: -2.3 dB/K
G/T (Ku-Band)		CONUS: +0.7 dB/K Alaska: -3.3 dB/K Caribbean: -3.2 dB/K Hawaii: +0.6 dB/K Mexico: -4.2 dB/K Puerto Rico / United States Virgin Islands: +0.7 dB/K Southern Canada: -1.6 dB/K
SFD Range (Beam Edge)	C-Band:	-92.0 to -71.0 dBW/m2
	Ku-Band:	-96.0 to -75.0 dBW/m2

Platform operators

The K_u-Band side of the satellite carried the platforms of Pittsburgh International Telecommunications, Inc (PIT), Globecast, RRSat, and ABS-CBN, with free-to-air and encrypted television and radio programming in a variety of languages.

See also

• FTA Receiver

External links

• RRsat website
• Intelsat website
• Pittsburgh International Telecommunications Information
• Channels carried on Galaxy 25 (Lyngsat)
• Globecast website