Key statistics
Satellite CZ-4B R/B at a glance.
Uptime
9498
Days in orbit
Revolutions
≈ 14.4
Per day
Orbit
SSO
Sun Synchronous Orbit
Inclination
98.8
Latest
Satellite identification and parameters
Extended collection of information and parameters for CZ-4B R/B.
Object identification
Identified? True
Debris? False
Object name: CZ-4B R/B
International designator: 1999-057C
Object number (NORAD): 25942
Object ID (CCSDS): 25942
Country: PEOPLES REPUBLIC OF CHINA (PRC)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 100.127 minutes
Inclination: 98.76 deg
SMA: 7142.689 km
Apoapsis: 832.622 km
Periapsis: 696.487 km
RAAN: 330.7916 deg
Eccentricy: 0.00952968
Argument of periapsis: 223.9409 deg
Mean anomaly: 135.4173 deg
Mean motion: 14.3816961 rev/day
Mean motion (dot): 0.00000514 rev/day2
B* drag term: 0.00017600092 1/REarth
Two-line elements (TLE)
Creation date: Oct. 15, 2025, 2:21 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Oct. 14, 2025, 8:19 p.m. UTC
TLE line 0: 0 CZ-4B R/B
TLE line 1: 1 25942U 99057C 25287.84715409 .00000514 00000-0 17600-3 0 9991
TLE line 2: 2 25942 98.7600 330.7916 0095297 223.9409 135.4173 14.38169610360321
Live tracking on map
Real-time ground track for satellite CZ-4B R/B.
In-orbit conjunctions
A list of the most updated potential collisions computed for object CZ-4B R/B.
Associated space launch
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).
CZ-4B R/B was lifted into orbit during the mission ‘Long March 4B | Zi Yuan 1-1’, on board a Long March 4B space rocket.
The launch took place on Oct. 14, 1999, 3:15 a.m. from Launch Complex 7.
For more information about the launch, click the button.
Long March 4B | Zi Yuan 1-1
Agency: N/A
Status: Launch Successful
Launch date: Oct. 14, 1999, 3:15 a.m. UTC
Rocket: Long March 4B
Launch pad: Launch Complex 7
Location: Taiyuan Satellite Launch Center, People's Republic of China
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