X Report 19 Dec 2025
A partial breakup incident involving a Starlink satellite raised concerns, while SpaceX continued its ambitious projects and launches.
CZ-4C R/B (49123)
COSPAR: 2021-079B | Alt Name: CZ-4C Y40 Stage 3
Image
Additional Sources
Launch Details
Launch Date
September 7, 2021
Launch Site
TAISC
Launch Pad
LC9
Launch Vehicle
Chang Zheng 4C
Orbital Elements
NORAD ID
49123
International Designator
2021-079B
Epoch
Sat, 04 Jul 2026 01:41:06 GMT
Apogee
Calculating...
Perigee
Calculating...
Inclination
98.37°
Right Ascension
49.82°
Eccentricity
Calculating...
Argument of Perigee
355.59°
Period
95.39 min
Mean Motion
15.10 rev/day
Latitude
Calculating...
Longitude
Calculating...
Altitude
Calculating...
Velocity
Calculating...
Polar Plot
3D Visualization
Basic Satellite Info
Name
CZ-4C R/B
Alternative Name
CZ-4C Y40 Stage 3
Type
Rocket Body
Status
Space Junk
Owner
CNSA
Country
China
Constellation
N/A
Related Satellites
Major Events
N/A
Latest TLEs
1 49123U 21079B 26185.07021078 .00003061 00000-0 17145-3 0 9996
2 49123 98.3720 49.8164 0106244 355.5937 4.4344 15.09619622263973
Source: Celestrak
Summary
A rocket body, also commonly referred to as an upper stage or spent rocket stage, is the structural shell left behind after a rocket has delivered its payload to orbit. These large and often heavy pieces of space hardware can remain in orbit for years, posing significant collision hazards as part of the growing space debris problem. If left uncontrolled, rocket bodies have the potential to reenter Earth's atmosphere unpredictably, which can lead to falling debris in populated areas. Additionally, they risk colliding with operational satellites or the International Space Station, creating more debris and putting human life at risk.
Physical Characteristics
Length
6.9
Diameter
2.9
Span
6.9
Dry Mass
1000
Launch Mass
1000
Shape
Cyl
Radar Cross Section
Unknown
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
CZ-4C Stage 3
Purpose
Unknown
Mission
Unknown
Manufacturer
SAST
Life Expectancy
Unknown
Bus
CZ-4 Stage 3
Configuration
Unknown
Motor
Unknown
Equipment
Unknown
Power System
Unknown
ADCS
Unknown
Transmitter Frequency
Unknown
Map
Next Pass
Azimuth Elevation Time (Local)
Start Azimuth
Max Elevation
Stop Azimuth
Time Until
Pass Duration
Satellite Articles
View All Posts »Learn more about satellites and other related topics.
X Report 26 Aug 2025
SpaceX's ongoing challenges with the Starship Flight 10 launch are prominent today, as weather and technical issues continue to push back the schedule. Meanwhile, successful cargo missions to the ISS highlight the company's ongoing commitment to space operations.
Space Brief 14 Sep 2025
Today's highlights include SpaceX's 300th Starlink launch, NASA re-establishing contact with a TRACERS satellite, and budget concerns impacting the commercial remote sensing industry.
Boeing Starliner Grounded Until Mid-2027, NASA Warns | KeepTrack Space Brief
Boeing CST-100 Starliner faces up to one year delay before return-to-flight. NASA safety panel cites unresolved technical problems since mid-2024 crewed test.
Space Brief 3 Sep 2024
Today's brief covers China's Yaogan-43 satellite launch, delays in ESA's BepiColombo mission, regulatory approval for OHB's KKR deal, and an upcoming Sentinel-2C launch.
X Report 20 Jun 2025
SpaceX experiences significant setbacks with Starship after Ship 36 explodes during static fire preparations, while Eutelsat secures funding to bolster competition against Starlink.
Musk Denies SpaceX AI Phone Report; EchoStar Bankruptcy | KeepTrack X Report
SpaceX hits 77 Falcon 9 launches in 2026 as EchoStar subsidiaries file Chapter 11 and Musk disputes WSJ AI phone claims.
Space Force Stands Up SPACEFOR-NORTH for Homeland Defense | KeepTrack Space Brief
Space Force inaugurates SPACEFOR-NORTH at Peterson SFB for homeland defense. Viridian inks AFRL satellite agreement. HASC chair seeks $450B defense fund.