Galaxy 4R

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General

Designation	26298 / 00020A
Launch date	19 Apr 2000
Country of origin	United States
Mission	Telecommunications
Geostationary orbit	see below
Launch vehicle	Ariane V129_v129

The secondary XIPS propulsion system failed in Jun 2003. The primary was already dead. Therefore only 3 years lifetime remain with the traditional fuel. The satellite is insured for such failures.

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Location

Begin	End	Position
L: 19 Apr 2000	Jun 2000	73°W
Jun 2000	Aug 2006	99°W
Sep 2006	Apr 2009	76.85°W, inclined

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End of life

Out of service	Apr 2009
Cause	moved to the junk orbit

sat-index articles

Technical data

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Lyngsat transponder loading

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EIRP coverage (dBW)

C-band Horizontal
C-band Vertical
Ku-band Horizontal
Ku-band Vertical

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G/T coverage (dB/K)

C-band Horizontal
C-band Vertical
Ku-band Horizontal
Ku-band Vertical

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Specifications

Prime contractor	Hughes
Platform	HS-601HP
Mass at launch	3716 kg
Dry mass	1895 kg
Mass in orbit	2511 kg
Dimension	stowed: 2.7 x 3.6 x 4 m
Solar array	26 m span, gallium arsenide
Stabilization	3-axis
DC power	BOL: 8800 W EOL: 7800 W
Design lifetime	15 years

Beacons: 4.198125 V and 4.199625 H GHz
ULPC: 12.195 V and 11.701 H GHz

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C-band

Main transponders	24
Backup transponders	4
Power	40 W
Bandwidth	36 MHz
Coverage	North America
EIRP max	41 dBW
G/T max	-1 dB/K
Polarization	linear H/V
SFD	-94 dBW/m² (at 0 G/T & 0 dB attenuation)
Frequencies	Uplink: 5.925 - 6.425 GHz Downlink: 3.700 - 4.200 GHz

C-band transponder frequency chart

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Ku-band

Main transponders	24
Backup transponders	4
Power	108 W
Bandwidth	36 MHz
Coverage	North America
EIRP max	45 dBW
G/T max	0 dB/K
Polarization	linear H/V
SFD	-94 dBW/m² (at 0 G/T & 0 dB attenuation)
Frequencies	Uplink: 14.000 - 14.500 GHz Downlink: 11.700 - 12.200 GHz

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Ku-band transponder frequency chart (GHz)

Horizontal Uplink	Horizontal Downlink	Transponder	Vertical Downlink	Vertical Uplink
	11.720	1		14.020
14.040		2	11.740
	11.760	3		14.060
14.080		4	11.780
	11.800	5		14.100
14.120		6	11.820
	11.840	7		14.140
14.160		8	11.860
	11.880	9		14.180
14.200		10	11.900
	11.920	11		14.220
14.240		12	11.940
	11.960	13		14.260
14.280		14	11.980
	12.000	15		14.300
14.320		16	12.020
	12.040	17		14.340
14.360		18	12.060
	12.080	19		14.380
14.400		20	12.100
	12.120	21		14.420
14.440		22	12.140
	12.160	23		14.460
14.480		24	12.180

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