Long March 4B • Ziyuan-3-2 & NuSat-1 & NuSat-2

It will be second satellite from series of civilian mapping spacecrafts named Ziyuan-3 operated by State Bureau of Surveying and Mapping. First, Ziyuan-3-1 was launched on 9 January 2012 also on atop of Long March 4B from Taiyuan Satellite Launch Center. These satellites are designed and manufactured by China's Academy of Space Technology and equipped with three cameras made by Changchun Institute of Optics, Fine Machinery and Physics. One camera is operating in 2.5 m resolution, two others are operating in 4 m resolution. Additional equipment is  infrared multispectral spectrometer operating with resolution of 6 m. Satellite is designed to be used for urban planning, resource monitoring and disaster management. Satellite weight is 2630kg, it is powered by two deployable solar arrays and onboard battery, operational life is at around 5 years on Sun Synchronous Orbit at altitude of 500 km. Long March 4B is in service since 1999. It was designed by China Academy of Launch Vehicle Technology for LEO and SSO missions with possibility of lifting up to 4200 kg of payload (for LEO, for SSO it is 2800 kg). It consists three stages fueled with N2O4/UDMH; rocket is long for 45.8 m with diameter at 3.35 m and weighs 249200 kg. Additional payload will be Argentinian Earth observation satellites NuSat-1 and NuSat-2 will be launched on 30th April 2016 on atop of Long March 4B rocket from Taiyuan Satellite Launch Center. They will be part of Aleph constellation of commercial Earth observation satellites by startup Satellogic Company. Unique feature of Aleph constellation will be commercially available real-time Earth imaging. For founder of Satellogic,  Emiliano Kargieman, ultimate goal is constellation of 300 satellites. NuSat-1 and NuSat-2 are beginning of the fleet - they are small spacecrafts with weight at 35 kg and with dimensions at 75 cm x 40 cm x 43 cm (H x W x L). Both will be equipped in camera operating in visible light and infrared. Onboard U/V linear transponder provided by AMSAT-LU (amateur radio satellite organization in Argentina) for communication with radio amateur community; additional U/V transponder (2 W of output power) for 8 GHz downlink and 2 GHz uplink will be operating on 100 kHz bandwidth. For backup telemetry, designers are considering UHF transponder.