X Report 7 Mar 2025
Starship Flight 8 ends with mixed results as SpaceX successfully catches Super Heavy booster but loses the upper stage in a fiery breakup.
SL-4 R/B (08339)
COSPAR: 1975-093B | Alt Name: Soyuz-U No. 021 Blok-I
DECAYED
Image
Additional Sources
Launch Details
Launch Date
September 29, 1975
Launch Site
Launch Pad
LC1
Launch Vehicle
Soyuz-U
Orbital Elements
NORAD ID
08339
International Designator
1975-093B
Decay Date
10/6/1975
Basic Satellite Info
Name
SL-4 R/B
Alternative Name
Soyuz-U No. 021 Blok-I
Type
Rocket Body
Status
Space Junk
Owner
RVSN
Country
USSR
Constellation
N/A
Related Satellites
Major Events
N/A
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
6.7
Diameter
2.7
Span
6.7
Dry Mass
2350
Launch Mass
2350
Shape
Cyl
Radar Cross Section
Unknown
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
11S510
Purpose
Unknown
Mission
Unknown
Manufacturer
PROG
Life Expectancy
Unknown
Bus
Blok-I
Configuration
Unknown
Motor
Unknown
Equipment
Unknown
Power System
Unknown
ADCS
Unknown
Transmitter Frequency
Unknown
Satellite Articles
View All Posts »Learn more about satellites and other related topics.
Space Brief 10 May 2025
Today's brief covers Rocket Lab's Neutron being selected for military tests, Space Force's strategic updates, Germany's SAR satellite plans, and a significant NASA nomination.
The Day Destiny Changed the Space Station Forever
Twenty-four years ago, two spacewalking astronauts battled an ammonia leak while installing the U.S. Laboratory module Destiny, transforming the International Space Station from a construction site to a world-class research facility
Space Brief 5 Sep 2024
Today we cover the final launch of Vega's original version, a significant milestone for SpaceX with the U.S. military, preparations for NASA's Starliner return, and more.
X Report 2 May 2025
SpaceX successfully launched 28 more Starlink satellites from Cape Canaveral, marking another milestone in its satellite constellation expansion.
Space Force Adds Relativity, Impulse to NSSL Phase 3 | KeepTrack Space Brief
Space Force expands National Security Space Launch Phase 3 with Relativity Space and Impulse Space joining Lane 1 competition. New entrants gain pathway to military payload contracts.
Space Brief 10 Nov 2025
Today's brief covers China's record-breaking launch year, SpaceX's continued Starlink deployments, Blue Origin's launch challenges, and innovations in satellite maneuverability.
Space Brief 22 Jul 2025
Today's highlights include ExoMars' successful parachute test, developments in military satellite systems, and leadership changes at NASA Goddard.