N-Star a [SSL]
Two Space Systems/Loral (SS/L) satellites with the highest capacity of any commercial payloads in space were delivered on orbit in 1995 and 1996 and are now providing a variety of fixed and mobile domestic communications services to customers throughout Japan. These satellites, N-STAR-a and -b, replace the service of the SS/L CS satellites, which have now exceeded their expected lifetimes, and will also provide significant new services, which range from providing alternate routes for telephony, to emergency communications, to marine and terrestrial mobile services, and ISDN. The N-STARs were built for Nippon Telegraph and Telephone (NTT) and NTT Mobile Communication Network Inc. (NTT DoCoMo). Dubbed switchboards in the sky, for their wide range of abilities, these 26-transponder satellites each carry five separate communications payloads operating in four frequency bands:
In N-STAR, SS/L delivered a turnkey package on orbit that included design and construction of the satellite, procurement of launch services and insurance, orbit raising, and in-orbit checkout. The N-STARs were launched aboard Ariane-44P H10-3 vehicles.
SS/L's SSL-1300 platforms are designed to achieve long useful orbital life – in this case 10 years – through use of a bipropellant propulsion system and a momentum-bias system for excellent stationkeeping and orbital stability. Solar arrays and nickel-hydrogen batteries provide uninterrupted electrical power.
|Type / Application:||Communication|
|Contractors:||Space Systems/Loral (SS/L)|
|Equipment:||5 × 100 MHz bandwidth Ka-band transponders, 6 × 200 MHz bandwidth Ka-band transponders, 8 × 54 MHz bandwdith Ku-band transponders, 6 × 72 MHz bandwidth C-band transponders, 2 beams S-band 10 MHz, 2 beams S-band 12 MHz|
|Power:||2 deployable solar arrays, batteries|
|Mass:||3400 kg (2050 kg BOL, 1617 kg dry)|
|N-Star a||1995-044A||29.08.1995||Ko ELA-2||Ariane-44P H10-3|
|N-Star b||1996-007A||05.02.1996||Ko ELA-2||Ariane-44P H10-3|