Spaceflight Insider

Long March 2D sends Zhangheng-1 seismo-electromagnetic spacecraft and six small satellites into space

Long March 2D launches from the Jiuquan Satellite Launch Center on February 2.

Long March 2D launches from the Jiuquan Satellite Launch Center on February 2. Photo Credit: Wang Jiangbo/Xinhua

China launched its first seismo-electromagnetic satellite, known as Zhangheng-1 on Friday, Feb. 2, atop a Long March 2D rocket. Six other smaller satellites also piggybacked on the mission. The flight highlighted China’s growing space ambitions.

The mission lifted off into the sky at 7:51 GMT (2:51 a.m. EST) from Launch Area 4 (LA-4) at the Jiuquan Satellite Launch Center (JSLC) in China’s Gansu Province.

Chinese media has not disclosed any details about the preparations for the mission or about the Long March 2D’s ride to space. Officials postponed the mission from Aug. 16, 2017. As of this writing, they have not offered any explanation behind this move.

The Long March 2D’s flight most likely concluded within 10 minutes after liftoff, given that it delivered its passengers into a Sun-synchronous orbit (SSO). The nominal flight timeline of this rocket includes first stage separation about two and a half minutes after launch, and payload fairing detachment approximately one minute later. Therefore, the second stage controls the flight for the remaining 7 to 8 minutes in order to deploy the payload into targeted orbit.

The success of the mission was confirmed by the state-run Xinhua press agency, within 50 minutes after leaving the pad.

The primary payload of Friday’s mission was the Zhangheng-1 experimental seismo-electromagnetic satellite, also known as the China Seismo-Electromagnetic Satellite (CSES). The mission is a joint Chinese-Italian project dedicated to the observation of ionospheric precursors of earthquakes.

Zhangheng-1 was inserted into a SSO at an altitude of about 310 miles (500 kilometers), inclined 98 degrees. It will now be jointly operated by the China National Space Administration (CNSA) and Italian Space Agency (ASI) for a period of up to five years.

If everything works as advertised, the satellite should measure high-energy particles, plasma, electric and magnetic fields with a set of scientific instruments, including a High Energy Particle Detector (HEPD) and a Search-Coil Magnetometer (SCM). The spacecraft is called an “earthquake investigator” as it should allow scientists to monitor electromagnetic and atmospheric phenomena, and study correlations with the occurrence of seismic events. It should also provide insights into solar-terrestrial interactions, including phenomena like solar flares and coronal mass ejections (CMEs).

“It will help scientists monitor the electromagnetic field, ionospheric plasma and high-energy particles for an expected mission life of five years,” said Zhao Jian, a senior official with China National Space Administration (CNSA).

Zhangheng-1 was built by the China Academy of Space Technology (CAST) and is based on the company’s CAST2000 platform. The spacecraft weighs in at about 1,610 lbs. (730 kilograms) and is fitted with a lone deployable solar array.

The secondary payload for Friday’s mission includes the GomX-4A and GomX-4B six-unit CubeSats built by the Danish GomSpace company, ÑuSat 4 and ÑuSat 5 satellites for the Argentinian company Satellogic, and also FengMaNiu-1 and Shaonian Xing CubeSats for China.

GomX-4A will be operated by the Danish Ministry of Defence and was sent aloft so as to serve as a technology demonstrator. The satellite has the main goal of identifying best-practice and future efforts reinforcing Denmark’s surveillance of the Arctic. It is fitted with radio receivers capable of capturing position signals from ships and aircraft.

GomX-4B, operated by the European Space Agency (ESA), will test inter-satellite links and propulsive orbit control techniques for future constellation operations with GomX-4A. The CubeSat also carries the Cubesat Highly Integrated Memory Radiation Assurance experiment, known as Chimera, which is designed to test how ‘commercial-off-the-shelf’ (COTS) parts cope with bombardments of high-energy electrically charged atomic particles from the Sun and deep space.

“The GOMX-4B satellite is the most advanced satellite design we have initiated to date and we are very happy that ESA will participate in this project that will demonstrate possibilities of satellites flying in formation, assess the tandem effect synergy that open the doors to commercial opportunities for using the platform in future constellations for our customers,” said Niels Buus, CEO of GomSpace.

ÑuSat 4 and ÑuSat 5 are Earth-observing satellites built and operated by Satellogic. Both spacecraft are identical and weigh approximately 81.5 lbs. (37 kilograms).

The duo should replenish Satellogic’s Aleph-1 constellation aimed to deliver commercial Earth-observing services. When completed, the project is planned to consist of some 25 spacecraft orbiting in SSO at an altitude of about 300 miles (480 kilometers).

Meanwhile, FengMaNiu-1 (or FMN-1) is a technology demonstrator developed by Link Space Aerospace Technology Inc., which will be used by the company to test new optical components in space. It will also be used as a repeater for amateurs worldwide via the onboard transponder system. The satellite is a three-unit CubeSat weighing around 6.6 lbs. (3 kilograms).

According to Link Space, it will take some time to obtain first results from FengMaNiu-1’s optical system.

“We will see the panoramic photo and video in a week,” the company tweeted.

Shaonian Xing (“Youth Star” in Chinese) is a three-unit CubeSat with a mass of about 4.4 lbs. (2 kilograms), it was developed by teenagers as part of the Sat-China outreach project. The small satellite will be employed to engage youth into thinking about space, STEAM (Science, Technology, Engineering, Art and Mathematics) education, and satellite development.

The Long March 2D launcher that was selected for Friday’s flight is a two-stage rocket developed by the Shanghai Academy of Spaceflight Technology. It is mainly used to launch satellites into low-Earth orbit (LEO). The 135 foot (41.15 meters) tall booster can launch payloads of up to 3.5 metric tons to LEO and has an SSO capability of up to 1.3 metric tons.

The rocket was launched for the first time on Aug. 9, 1992, from the Jiuquan Satellite Launch Center, orbiting the Fanhui Shei Weixing FSW-2-1 recoverable satellite.

Friday’s flight was the 266th launch of the Long March rocket series and the third mission conducted from JSLC in 2018. China’s next orbital mission is currently slated to take place on February 11, when a Long March 3B booster will deliver the newest duo of BeiDou-3 navigation satellites into space. China has some 40 missions planned for 2018, marking one of the most ambitious launch manifests of the year.





Tomasz Nowakowski is the owner of Astro Watch, one of the premier astronomy and science-related blogs on the internet. Nowakowski reached out to SpaceFlight Insider in an effort to have the two space-related websites collaborate. Nowakowski's generous offer was gratefully received with the two organizations now working to better relay important developments as they pertain to space exploration.

Reader Comments

⚠ Commenting Rules

Post Comment

Your email address will not be published. Required fields are marked *