Gaofen-12-03 | Long March 4C

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Featured image credit: Xinhua
Lift Off Time

June 27, 2022 15:46 UTC | 23:46 BJT

Mission Name

Gaofen-12-03, a Chinese remote sensing satellite

Launch Provider
(What rocket company launched it?)

China Aerospace Science Corporation (CASC)

Customer
(Who paid for this?)

China National Space Administration as part of the China High-Resolution Earth Observation System

Rocket

Long March 4C

Launch Location

Site 9401 (SLS-2), Jiuquan Satellite Launch Center, China

Payload mass

Likely around ~1,100 kg, but a maximum of 2,800 kg (6,100 lbs) based on orbital parameters

Where did the satellite go?

599 x 595 km low-Earth polar orbit at 97.98º

Did they attempt to recover the first stage?

No, the Long March 4C is not capable of recovery

Where did the first stage land?

It crashed on land in North-West China

Did they attempt to recover the fairings?

No, the Long March 4C is not capable of recovery

Were the fairings new?

Yes

This was the:

– 44th launch of a Long March 4C
– 72rd orbital launch attempt of 2021

Where to watch:

Unofficial Replay

How Did It Go?

The China Aerospace Science Corporation successfully launched an Earth observation satellite on their Long March 4C rocket. The Gaofen-12-03 mission launched from the Jiuquan Satellite Launch Center, in China, to a Sun-synchronous low-Earth orbit. This launch marked the 46th launch of a Gaofen satellite.

Gaofen Satellites

The Gaofen constellation is a series of Chinese civilian Earth observation satellites. The constellation currently consists of just over 30 active satellites. The Gaofen constellation provides Chinese civilians with near real-time observations for geographical mapping, resource surveying, environmental research, climate change monitoring, and several other observation activities.

While not much is known about the Gaofen satellites, a lot can be learned from the Gaofen 1 satellites, which are similar. Each satellite has a mass of roughly 1,100 kg (2,400 lbs) and is based on the CAST-2000 extended spacecraft bus. The Gaofen-12-03 satellite has a lifespan of roughly 5 to 8 years and contains two sets of cameras. The first set of high resolution cameras have a swath of roughly 69 km (43 miles) and the second set of wide field of view cameras have a swath of 830 km (516 miles).

The Gaofen-12-03 satellite is also equipped with a 3-axis stabilization which ensures that the satellites are always pointed towards the Earth. Due to this, an individual satellite is able to revisit every part of the Earth in under 4 days.

A Gaofen-1 satellite (Credit: CAST)

Long March 4C

The Long March 4C is a three-stage medium-lift launch vehicle derived from China’s Long March 4B vehicle. It is able to put up to 4,200 kg into low-Earth orbit, 2,600 kg into a Sun-synchronous orbit, and up to 1,500 kg into geostationary transfer orbit (GTO).

A Long March 4C rocket shortly after being released from the ground support equipment (GSE) (Credit: Xinhua)

First Stage

The first stage has four open cycle YF-21C engines. Each engine runs on dinitrogen tetroxide (N2O4) and unsymmetrical dimethylhydrazine (UDMH), producing 740 kN of thrust, with a specific impulse (ISP) of 260 seconds. Overall, the first stage produces 2,960 kN of thrust and carries 182,000 kg of propellant. The first stage is 27.91 m tall, and 3.35 m in diameter.

Second Stage

The second stage runs on a single YF-24C engine, which contains a single main YF-22C engine for thrust, and four YF-23C attitude control thrusters. The main engine produces 742 kN of thrust and the attitude control thrusters each produce 47 kN, and both run on N2O4 and UDMH. The main engine’s ISP is 300 seconds, and the attitude control thrusters have an ISP of 289 seconds. The second stage is 10.9 m tall, 3.35 m in diameter, and carries 52,700 kg of propellant.

Third Stage

The third stage has two open-cycle YF-40A engines that also run on N2O4 and UDMH. Each engine produces just over 100 kN of thrust and has an ISP of 303 seconds. The third stage is 14.8 m tall and 2.9 m wide.

The post Gaofen-12-03 | Long March 4C appeared first on Everyday Astronaut.

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