CHINA AEROSPACE SCIENCE AND TECHNOLOGY CORPORATION

Long March 4B | Zi Yuan 1-1

SUCCESS Long March 4B →
Oct 14, 1999 at 03:15 UTC
Low Earth Orbit Earth Science Taiyuan Satellite Launch Center, People's Republic of China 98% success
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PADLaunch Complex 7
SITETaiyuan Satellite Launch Center, People's Republic of China →
ORBITLow Earth Orbit
TYPEEarth Science

The CBERS (China Brazil Earth Resources Satellite) or ZY 1 (Zi Yuan) satellites are designed for global coverage and include cameras to make optical observations and a data collecting system to gather data on the environment. They are unique systems due to the use of on-board sensors which combine features that are especially designed to resolve the broad range of space and time scales involved in the monitoring and preservation of the ecosystem. They are operated jointly by the China Centre for Resources Satellite Data and Application (CRESDA) and the Brazilian INPE (Instituto Nacional de Pesquisas Espaciais, National Institute of Space Research).

MISSION
Zi Yuan 1-1
MISSION TYPE
Earth Science
TARGET ORBIT
Low Earth Orbit
LAUNCH PAD
Launch Complex 7
COUNTRY
CHN
CONFIRMEDPrecision: Minute
LAUNCH LIBRARY 2 PRIMARY
API ID: ab3cda2a-828d-459f-a83a-e63a227e1840
Reported date: Oct 14, 1999 at 03:15 UTC
Last synced: 9 minutes ago
This launch date and time are confirmed by the launch provider. Countdown is active.
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MANUFACTURER
China Aerospace Science and Technology Corporation
VARIANT
B
FLIGHTS
56
SUCCESSES
55
SUCCESS RATE
98.2%

The Long March 4B (Chinese: 长征四号乙火箭), also known as the Chang Zheng 4B, CZ-4B and LM-4B is a Chinese orbital carrier rocket. Launched from Launch Complex 1 at the Taiyuan Satellite Launch Center, it is a 3-stage rocket, used mostly to place satellites into low Earth and sun synchronous orbits.

When is the Long March 4B | Zi Yuan 1-1 launch?
The Long March 4B | Zi Yuan 1-1 is scheduled for Thursday, October 14, 1999 at 3:15 AM UTC. This is the NET (No Earlier Than) time and may be subject to change. Current status: SUCCESS.
What rocket is being used for Zi Yuan 1-1?
The Long March 4B | Zi Yuan 1-1 mission uses the Long March 4B rocket, manufactured by China Aerospace Science and Technology Corporation. The Long March 4B has flown 56 times with a 98.2% success rate.
Where is the Long March 4B | Zi Yuan 1-1 launching from?
The launch takes place from Launch Complex 7 at Taiyuan Satellite Launch Center, People's Republic of China.
What orbit is Zi Yuan 1-1 going to?
The Zi Yuan 1-1 mission is targeting Low Earth Orbit.
Who is launching Zi Yuan 1-1?
The Long March 4B | Zi Yuan 1-1 is operated by China Aerospace Science and Technology Corporation.
Can I watch the Long March 4B | Zi Yuan 1-1 launch live?
Yes. Visit the launch detail page on Space Launch Live for embedded YouTube webcasts, replay videos, and links to live coverage from SpaceX, NASA, NASASpaceflight, and other channels.
Mar 29, 2026 01:16 UTC
Launch added to tracker
Imported from Launch Library 2 API
Mar 29, 2026 01:16 UTC
Launch date set: Oct 14, 1999 at 03:15 UTC
NET (No Earlier Than) confirmed by China Aerospace Science and Technology Corporation
Mar 29, 2026 01:16 UTC
Launch completed successfully
Updated via Launch Library 2
Last data sync: 9 minutes ago
Launch Library 29 minutes ago
Launch ID: ab3cda2a-828d-459f-a83a-e63a227e1840
Open-Meteo Weather21 hours ago
Pad weather at 38.85, 111.61

Mission Profile

Zi Yuan 1-1 was a Long March 4B mission operated by China Aerospace Science and Technology Corporation that lifted off from Launch Complex 7, Taiyuan Satellite Launch Center, People's Republic of China on October 14, 1999. The flight carried its payload on a earth science mission to Low Earth Orbit. The launch was a success.