Galaxy 13

Also called Horizons 1, S2386

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General

Designation	27954 / 03044A
Launch date	1 Oct 2003
Country of origin	United States
Mission	Telecommunications
Geostationary orbit	see below
Launch vehicle	Zenit Sea Launch #11

Part of the Horizons joint venture. Replaced Galaxy 9.

Tested at 144.5°W and started service on 12 Jan 2004. Licence extended till end of 2025.

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Location

Begin	End	Position
L:	Nov 2003	144.5°W
Jan 2004	Oct 2023	127°W
Nov 2023		150°W

Technical data

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Lyngsat transponder loading

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EIRP coverage (dBW)

Ku-band

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G/T coverage (dB/K)

Ku-band

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Specifications

Prime contractor	Boeing
Platform	HS-601HP
Mass at launch	4090 kg
Mass in orbit	2630 kg
Dimension
Solar array	dual junction
Stabilization	3-axis
DC power	BOL: 9.9 kW EOL: 8.6 kW
Design lifetime	15 years

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C-band (Galaxy 13)

Main transponders	24
Backup transponders	8
Power	40 W (LTWTAs)
Bandwidth
Coverage	127°W: North America, Central America, Alaska and Hawaii
EIRP max	40 dBW
G/T max	3 dB/K
Polarization	linear H/V cross-pol

C-band transponder frequency chart

The C-band payload is known as Galaxy 13. Will replace Galaxy 9.

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Ku-band (Horizons 1)

Main transponders	24
Backup transponders	8
Power	108 W (LTWTAs)
Bandwidth	36 MHz
Coverage	127°W: Hawaii, Alaska, Conus, par of the Caribbean
EIRP max	48 dBW
G/T max	2 dB/K
Polarization	linear H/V
Frequencies	uplink: 14.0-14.5 GHz downlink: 11.7-12.2 GHz

The Ku-band payload is known as Horizons 1, it is owned by JSAT. It will serve to relay via an earth station in Hawaii for Asian regions. In mid-2024 the FCC allowed the Ku-band payload to be used to the USA.

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Transponder frequency chart (GHz)

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

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