July 23, 2016 - China Launches Satellite for Communication Services

On July 23, 2016, you witnessed China launch the APSTAR-9 satellite aboard a Long March 3B rocket from Xichang Satellite Launch Center. The 5,200 kg communications satellite reached geostationary orbit at 142° East, carrying 46 transponders across C-band and Ku-band frequencies. It delivers TV, internet, VSAT, and maritime connectivity across Asia-Pacific, Europe, Africa, and Hawaii. There's far more to this mission's technology, partnerships, and regional impact than you'd expect.

Key Takeaways

• China launched the APSTAR-9 communication satellite on July 23, 2016, using a Long March-3B/E rocket from Xichang Satellite Launch Center.
• The satellite was placed into geostationary orbit at 142° East, approximately 35,802.7 kilometers above Earth, within 26 minutes of liftoff.
• APSTAR-9 carries 46 transponders — 32 C-band and 14 Ku-band — supporting TV, VSAT, maritime, and inflight connectivity services.
• The satellite's C-band coverage spans Asia, Europe, Africa, Australia, and Hawaii, while Ku-band beams serve Asia-Pacific oceanic zones.
• Built on the DFH-4 platform by CAST, APSTAR-9 weighs approximately 5,200 kg and has a designed operational lifetime exceeding 15 years.

What Was the APSTAR-9 Mission and Why Did It Matter?

On October 17, 2015, China launched the APSTAR-9 satellite from the Xichang Satellite Launch Center aboard a Long March-3B/G2 rocket, placing it into geostationary orbit at 142° East.

Built by the China Academy of Space Technology on a DFH-4 platform, it replaced the aging APSTAR-9A, which had been in service since 1998.

APT Satellite Company Limited owns and operates it, targeting three-quarters of the global population across Asia, Europe, Africa, and Australia.

Its planned in-orbit longevity exceeds 15 years, ensuring sustained service well into the future.

With 46 transponders supporting TV, DTH, VSAT, and maritime connectivity, its market impact extends across the Asia-Pacific region, strengthening APT Satellite's fleet and expanding its customer base significantly. A designated portion of its C-band capacity was allocated to TS Global Network under the MySat 1 payload agreement, enabling VSAT connectivity across ASEAN and Asia-Pacific markets.

Following the successful launch, APT Satellite signed a follow-on agreement with China Great Wall Industry for APSTAR-6C, a second DFH-4 platform satellite featuring 45 transponders across C, Ku, and Ka bands, designed to replace the in-orbit APSTAR-6 and support VSAT, video distribution, DTH, and cellular backhaul applications. The satellite's maritime connectivity capabilities build on a long tradition of oceanic wireless communication, tracing back to Marconi's development of selective tuning technology, which first made reliable ship-to-shore transmissions commercially viable in the early twentieth century.

What Made APSTAR-9 a Heavyweight in Satellite Tech?

APSTAR-9 earned its heavyweight status through a combination of raw power, transponder capacity, and coverage reach that set it apart from conventional communication satellites. You're looking at a 5,200 kg platform built on the DFH-4 bus, making it a genuine heavy lift contender in geostationary orbit.

Its high power output sustained 46 transponders across C-band and Ku-band frequencies simultaneously, demanding serious thermal management to maintain performance across extended operations. Payload integration brought together 32 C-band and 14 Ku-band transponders onto a single spacecraft, delivering capacity equivalent to 60.5 x 36 MHz combined.

Twin deployable solar arrays paired with batteries supported a 15-plus year operational lifetime. That combination of mass, power, and integrated payload capability placed APSTAR-9 firmly among the most capable communication satellites of its generation. The satellite was positioned at 142°E orbital slot, taking over from its predecessor APSTAR-9A to continue uninterrupted service delivery across the region.

The Long March 3B/E launch vehicle carried APSTAR-9 into orbit on 17 October 2015, successfully inserting the satellite into its designated orbit before a series of LEOP operations and in-orbit testing were conducted. Much like Project Loon's stratospheric balloons, which relied on solar-powered onboard electronics to sustain operations at altitude, APSTAR-9 depended on its solar arrays and battery storage to maintain continuous functionality throughout its operational lifespan.

Who Actually Built APSTAR-9 and What Did They Contribute?

Two organizations drove APSTAR-9 from contract to orbit. CAST spacecraft engineers designed and built the satellite on the DFH-4 platform, delivering a 5,200 kg vehicle with dual deployable solar arrays, onboard batteries, and precision station-keeping within ±0.05° in both axes. Their work produced a platform engineered for 15+ years of GEO operation.

On the contractual side, CGWIC management handled everything from the November 2013 agreement with APT Satellite to launch coordination at Xichang LC-2. You can credit CGWIC with integrating the communication payloads, overseeing project timelines, and ensuring the satellite reached orbit ready for service. The satellite was ultimately positioned at 142° East geostationary orbit, providing coverage across Asia Pacific and Hawaii in C-band. Together, CAST's engineering expertise and CGWIC's project oversight turned a signed contract into a fully operational communications satellite serving Asia, Oceania, and the Pacific. The satellite carries a combined payload of 46 total transponders, split between 32 C-band and 14 Ku-band units, enabling broad and flexible communication services across its coverage regions. Much like Sputnik's radio transmissions, which broadcast on 20.005 and 40.002 MHz and were received by operators worldwide, APSTAR-9's signals are designed to serve a vast international audience across the Asia Pacific region.

Why Did China Choose the Long March 3B for This Launch?

When China needed a rocket to carry APSTAR-9 into geosynchronous transfer orbit, the Long March 3B was the obvious choice. Its 3B/E variant handles up to 5,500 kg to GTO, matching APSTAR-9's mass requirements precisely. The rocket's hypergolic propellants give it the precise burn control that orbital mechanics demand during GTO insertion, ensuring the satellite reaches the correct trajectory every time.

You'd also find launch economics equally compelling. China had already built the Long March 3B into a commercially competitive vehicle, using it to win international GEO satellite contracts across multiple markets. With 20 consecutive successful launches behind it by 2016, the rocket carried a reliability record that commercial operators couldn't easily dismiss. For a revenue-generating communications satellite like APSTAR-9, that combination of performance and dependability made the decision straightforward. The Long March 3B traces its lineage to the original Long March 3, which was manufactured by the China Academy of Launch Vehicle Technology and designed specifically for placing satellites into geosynchronous transfer orbits. Much like IBM's approach with the 5150, which relied on off-the-shelf components rather than custom-built solutions, the Long March 3B program prioritized proven, accessible technology to reduce development time and cost.

All Long March 3B missions lift off from the Xichang Satellite Launch Center in Sichuan, a facility that has supported the rocket since its introduction in 1996.

Why Was Xichang the Right Launch Site for the APSTAR-9 Mission?

Nestled in Sichuan province at roughly 1,800 meters elevation, Xichang Satellite Launch Center had every geographic and operational advantage APSTAR-9 needed. Its equatorial advantage over northern sites like Jiuquan and Taiyuan boosted GTO insertion efficiency, directly benefiting a satellite carrying 46 transponders with a 15-year design life. The elevated terrain also reduced atmospheric drag, helping the Long March 3B/G2 push heavier payloads into orbit.

You'll notice the site's ocean trajectory over the Pacific kept populated areas clear of falling rocket stages, minimizing safety risks. With over 200 launches completed and Launch Complex 2 specifically supporting the Long March 3 series since 1990, Xichang wasn't just a convenient choice—it was the proven, purpose-built facility China's geostationary missions consistently relied on. The center is operated by the People's Liberation Army Aerospace Force, known as Unit 63790, underscoring the military oversight behind every commercial and civil mission launched from the site.

Looking ahead, the broader Xichang region is poised for further expansion, with a proposed new spaceport site in Mianning county, Liangshan located less than 100 km from the existing launch center, alongside plans for an aerospace hi-tech manufacturing industrial park in nearby Xichang city.

How Did APSTAR-9 Travel From Launchpad to Geostationary Orbit?

Xichang's geographic advantages set the stage, but the real work began the moment the Long March CZ-3B/E (G2) ignited its engines.

Within 26 minutes of liftoff, the rocket had placed APSTAR-9 into a geostationary transfer orbit (GTO). Orbital mechanics then took over, guiding the satellite through carefully sequenced engine burns that gradually raised its orbit from GTO to the final geostationary position at 142° East.

Precise fuel budgeting ensured enough propellant remained for both the transfer maneuvers and the long-term station-keeping requirements that would follow.

Once APSTAR-9 reached its operational altitude of approximately 35,802.7 kilometers, it maintained position within ±0.05° precision parameters.

The entire trajectory demonstrated how disciplined mission planning transforms a rocket launch into a functioning communications asset. Built on the DFH-4 bus by CAST, APSTAR-9 was designed to support this demanding orbital profile with a total mass of 5,000 kilograms and a dry mass of 2,500 kilograms. The satellite's communications payload would ultimately contribute to a global fiber and wireless infrastructure in which, by 2000, over 80% of the world's long-distance traffic ran on optical fiber.

Which Countries Benefit Most From APSTAR-9's Coverage?

APSTAR-9's three-beam architecture stretches from the east Indian Ocean to the west Pacific, putting dozens of nations within reach of its transponders. China, as the operator nation through APT Satellite Company Limited, stands as the primary beneficiary.

The C-Band SEA beam delivers peak performance across ASEAN markets, directly serving Indonesia, Malaysia, the Philippines, Thailand, and Vietnam. Malaysia specifically gains MySat 1 payload capacity through this focused coverage.

Broader Asia-Pacific nations—India, Japan, Australia, and New Zealand—fall within the wider C-band footprint.

The satellite's steerable Ku-band beam handles DTH, VSAT, and mobility services across oceanic zones, while the expansive AP beam pulls in Pacific islands and Hawaii. Maritime and inflight operators working those ocean corridors also tap into APSTAR-9's reliable transponder capacity. For businesses targeting Chinese audiences across these regions, search visibility depends heavily on alignment with Baidu's local ranking signals, given that the platform commands over 64% combined market share across all platforms in China.

What Does APSTAR-9 Actually Deliver: C-Band vs. Ku-Band?

Understanding which nations benefit from APSTAR-9's reach naturally leads to a closer look at what its transponders actually deliver. APSTAR-9 carries 32 C-band and 14 Ku-band transponders, each serving distinct purposes.

You'll find C band resilience most valuable in challenging weather conditions, where rain fade stays minimal at just 0.4–1 dB attenuation. C-band supports VSAT, video broadcasting, and cellular backhaul across Asia-Pacific using larger 2.4–3.7m dishes.

Ku-band offers higher EIRP ratings of 45–54 dBW and Ku band steerability, letting operators redirect coverage as needed. It's ideal for DTH, maritime, and inflight connectivity using compact 0.9–1.8m dishes, though rain fade can reach 10 dB. Dedicated to satellite, Ku-band avoids the terrestrial microwave interference that has historically complicated C-band deployments.

Both bands use dual linear polarization and feature FGM and ALC gain control, ensuring reliable signal management throughout APSTAR-9's 15-year operational lifetime. Much like how Blu-ray's 405 nm laser enabled dramatically higher data density by focusing light into a tighter spot, satellite transponder technology relies on precise frequency engineering to maximize the amount of information transmitted across a given bandwidth.

Why Was APSTAR-9 a Milestone for the Long March Program?

The July 23, 2016 launch of APSTAR-9 marked the 210th successful launch for China's Long March rocket family, standing out as the 5th consecutive successful Long March 3B mission that year. You can see how this mission reliability translated into real credibility for China's commercial launch ambitions, pushing its global market share to 10%.

The Long March 3B achieved 100% success post-2007 improvements, and APSTAR-9 reinforced that streak by reporting zero anomalies during ascent or separation. In terms of payload milestones, the Yuanzheng upper stage validated its capability for GTO payloads up to 5,500 kg, inserting the satellite within 50 km of its target orbit. This directly paved the way for future missions, including APSTAR-9B in 2019. China's broader launch vehicle ambitions were also taking shape around this same period, as early concepts for the Long March 9 super-heavy lift rocket had begun emerging in 2011 and were continuing to evolve through design revisions during 2016.

The Long March family's commercial credibility had been hard-won over decades, with launches from Xichang launch centre serving as the primary hub for commercial satellite deployments like APSTAR-9. This growing commercial launch infrastructure reflects a broader global shift toward private and national operators competing for dominance in low Earth orbit and beyond, a trend that would only accelerate into the following decade.

How Did APSTAR-9 Change Connectivity Across the Asia-Pacific?

Stepping into service at 142°E, APSTAR-9 took over from APSTAR-9A with a dramatically expanded payload of 46 transponders—32 C-band and 14 Ku-band—nearly doubling the connectivity options available across the Asia-Pacific.

You'll notice three key shifts it delivered:

1. Broadcast reach extended from Southeast Asia across Oceania, Pacific islands, and Hawaii, supporting DTH and video services at 35–54 dBW EIRP.
2. Satellite roaming became practical for maritime and inflight users, thanks to Ku-band steerable beams covering the Indian to Pacific Oceans.
3. VSAT expansion enabled providers like TSGN to invest confidently in Southeast Asian markets, strengthening internet and cellular backhaul infrastructure.

Together, these capabilities reshaped how businesses and travelers accessed reliable connectivity across the region. This regional approach to satellite coverage reflects lessons learned from early communications satellites like Telstar 1, which demonstrated that low-orbit satellite systems are more vulnerable to environmental hazards and coverage gaps than architectures built around higher, stable orbital positions.