Horizons-1

Horizons-1, also known as Galaxy 13, is a geostationarycommunications satellite operated by Intelsat and SKY Perfect JSAT (JSAT) which was designed and manufactured by Boeing on the BSS-601 platform. It has K_u-band and C-band payload and was used to replace Galaxy 9 at the 127.0° West longitude.^[2] It covers North America, Puerto Rico, Alaska, Hawaii and Mexico.^[3][4][5][6]

The spacecraft was designed and manufactured by Boeing on the BSS-601satellite bus. It had a launch mass of 4,060 kilograms (8,950 lb) and a mass of 2,630 kilograms (5,800 lb) at the beginning of its 15-year design life. When stowed for launch, it measured 5.7 metres (19 ft) of height and 2.7 by 3.6 metres (8 ft 10 in × 11 ft 10 in) on its sides. Its solar panels span 26.2 metres (86 ft) when fully deployed and, with its antennas in fully extended configuration it is 7.0 metres (23.0 ft) wide.^[7]

It had two wings with four solar panels each that used dual-junctionGsAs solar cells. Its power system generated 9.9 kW of power at beginning of life and 8.9 kW at the end of its design life and had a 30-cell NiH battery for surviving solar eclipse.^[7]

Su sistema de propulsión estaba compuesto por un motor R-4D-11-300 LAE con un empuje de 490 newtons (110 lb _f ) . También contaba con doce propulsores bipropelentes de 22 newtons (4,9 lb _f ) para el mantenimiento de la posición y el control de actitud . Para el mantenimiento de la posición Norte-Sur , su método principal era un sistema de propulsión eléctrica con cuatro XIPS 13 , con cuatro de los propulsores químicos actuando como respaldo. Incluía suficiente propelente para la circularización de la órbita y 15 años de operación. ^{[ 5 ] [ 7 ]}  

Tenía dos antenas gregorianas de 2,7 metros (107 pulgadas) y dos antenas con forma de rejilla de 1,3 metros (50 pulgadas) . ^{[ 7 ]}  

Su carga útil en banda K _u está compuesta por 24 transpondedores activos más ocho de reserva de 36  MHz alimentados por TWTA con una potencia de salida de 108 vatios. Cubre Norteamérica, Puerto Rico, Alaska, Hawái y México y se conoce como Horizons-1 . ^{[ 5 ] [ 7 ] [ 8 ] [ 9 ] [ 10 ]}

La carga útil de banda C tenía otros 24  transpondedores de 36 MHz más ocho de repuesto alimentados por un TWTA de 40 vatios. Cubre Norteamérica, Puerto Rico, Alaska, Hawái y México y se conoce como Galaxy 13 , que se utilizó para reemplazar a Galaxy 9. ^{[ 7 ] [ 11 ] [ 12 ]}

Horizons Satellite was originally an equal share joint venture with PanAmSat. On 4 September 2001, it ordered from Boeing its first satellite, Horizons-1 / Galaxy 13.^[2] It was a 4,000 kilograms (8,800 lb) spacecraft with 24 C-band and 24 K_u-bandtransponders. It had a 10 kW power generation capacity and 15 years of expected life.^[7] On the same day of the satellite order, Boeing disclosed that it had received a parallel contract from PanAmSat, where the latter had exercised an existing option to launch Horizons-1 from its Sea Launch subsidiary.^[13]

It was successfully launched on 1 October 2003 at 04:03:07 UTC, aboard a Zenit-3SL rocket from the Ocean Odyssey platform stationed at the 154.0° West over the Equator in the Pacific Ocean.^[4][14]

In late 2005, PanAmSat was taken over by Intelsat who continued the joint venture.