Galaxy 11

USA



Launch data:

Designation: 26038 / 99071A
Launch date22 Dec 1999 - 00:50 UT
Launch site Ko, ELA-2
Launch vehicle  Ariane-44L (V125)
Mission Telecommunications
Geostationary orbit on:
Perigee / Apogee  km
Eccentricity 
Inclination  deg
Period  min

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


Location:

Begin End Position
L: 22 Dec 1999 Feb 2000 78.5°W
Mar 2000 Jun 2000 99°W (replaced Galaxy 6)
Jul 2000   91°W (replaced Galaxy 7)


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
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.

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

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)

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

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.

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

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.

Ref: #15 - update: 16.03.09