Galaxy 11

S2253

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General

Designation	26038 / 99071A
Launch date	22 Dec 1999
Country of origin	United States
Mission	Telecommunications
Geostationary orbit	see below
Launch vehicle	Ariane V125

Panamsat modified Galaxy 11 to enable operations from several of the company's orbital slots covering the United States.

The satellite suffers degradation of the solar panels and a claim for insurance constructive total loss was filled (approx $289 million) but the claim was rejected in Dec 2003; $130 million were obtained instead.

Licence to be extended till 30 Jun 2024

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Location

Begin	End	Position
L: 22 Dec 1999	Feb 2000	78.5°W
Mar 2000	Jun 2000	99°W (replaced Galaxy 6)
Jul 2000	Aug 2008	91°W (replaced Galaxy 7)
Sep 2008	Oct 2008	93°W
Nv 2008	Jun 2011	32.8°E (backup for Intelsat 802)
Aug 2011	Nov 2016	55.6°W
Apr 2016	Sep 2016	60.1°E
Oct 2016	Mar 2019	44.9°E
Jul 2019	Jul 2023	93.1°W, inclined
Dec 2023		166.3°E, inclined

sat-index articles

Technical data

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Lyngsat transponder loading

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EIRP coverage at 33°E (dBW)

C-band
Ku-band, North Africa
Ku-band, South Africa
Ku-band, Extended

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G/T coverage at 99°W (dB/K)

C-band Horizontal
C-band Vertical
Ku-band, North America H
Ku-band, North America V
Ku-band, Extended Horizontal
Ku-band, Extended Vertical

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Specifications

Prime contractor	Hughes
Platform	HS-702
Mass at launch	4450 kg
Dry mass	2750 kg
Dimension	stowed: 3.3 x 3.5 x 6.24 m
Solar array	31 m span, dual-junction gallium arsenide
Stabilization	3-axis
DC power	EOL: 10400 W
Design lifetime	15 years
Station keeping	Xenon Ion Propulsion System (XIPS)

two 2.4 m diameter + two 1.8 m diameter antennas
TT&C: uplink 14.0005 & 14.4985 GHz; downlink: 11.701 & 11.702 GHz

First satellite to use ion propulsion to go from geostationary transfer orbit to circular geostationary orbit, using its 25-cm XIPS ion thruster. It also carries a bipropellant engine of some kind.
This satellite has faulty HS-702 solar panels that may affect its lifetime.

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C-band

Main transponders	24
Backup transponders	6
Power	20 W
Bandwidth	36 MHz
Coverage	North America and Hawaii
EIRP max	38 dBW (Hawaii: 32 dBW)
G/T max	+1 dB/K (Hawaii: -4 dB/K)
Polarization	linear H/V
SFD	at 0 G/T & 0 dB attenuation: -91.5 dBW/m² H and -91 dBW/m² V
Frequencies	Uplink: 5.925-6.425 GHz Downlink: 3.700-4.200 GHz

C-band transponder frequency chart

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Ku-band (11.7-12.2 GHz)

Main transponders	24
Backup transponders	6
Power	75 W
Bandwidth	36 MHz
Coverage	CONUS
EIRP max	47 dBW
G/T max	3 dB/K
Polarization	linear H/V
SFD	at 0 G/T & 0 dB attenuation: -93.5 dBW/m² H & V
Frequencies	Uplink: 14.0-14.5 GHz Downlink: 11.7-12.2 GHz

TM beacons: 11.701 & 11.702 GHz in both polarities
ULPC beacons: 12.195 GHz H (North America) and 10.951 GHZ H & V (Conus and Brazil)
Command: 14.0005 & 14.4985 GHz

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Transponder frequency chart (GHz)

Horizontal Downlink	Horizontal Uplink	Transponder	Vertical Uplink	Vertical Downlink
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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Ku-band (10.95-11.2 GHz) (called extended)

Main transponders	16
Backup transponders	4
Power	140 W
Bandwidth	27 MHz
Coverage	CONUS & Brasil
EIRP max	44 dBW North America 46 dBW Brasil
G/T max	-4 dB/K North America -2 dB/K Brazil
Polarization	linear H/V
SFD	at 0 G/T & 0 dB attenuation: -89 dBW/m² H & V
Frequencies	Uplink: 13.75-14.0 GHz (North Am), 14.00-14.25 GHz (Brazil) Downlink: 10.95-11.2 GHz

Beacons: 12.195 GHz H to North America and 10.951 GHz in both polarizations to Brasil

NOTE: recent Panamsat documentation does not cover the Extended payload. Details included here are from older documentation. It might no longer be accurate.

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Downlink Transponder frequency chart (GHz)

Horizontal	Transponder	Vertical
10.964	1
	2	10.976
10.994	3
	4	11.006
11.024	5
	6	11.036
11.054	7
	8	11.066
11.084	9
	10	11.096
11.114	11
	12	11.126
11.144	13
	14	11.156
11.174	15
	16	11.186

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Uplink Transponder frequency chart (GHz)

Horizontal North Am	Horizontal Brasil	Transponder	Vertical North Am	Vertical Brasil
13.764	14.014	1
		2	13.776	14.026
13.794	14.044	3
		4	13.806	14.056
13.824	14.074	5
		6	13.836	14.086
13.854	14.104	7
		8	13.866	14.116
13884	14.134	9
		10	13.896	14.146
13.914	14.164	11
		12	13.926	14.176
13.944	14.194	13
		14	13.956	14.206
13.974	14.224	15
		16	13.986	14.236

For each transponder, uplink is possible from only 1 of the North America or Brasil frequency.

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