Space Brief 20 Jul 2025
Today's highlights include a SpaceX launch of Starlink satellites, a pivotal delivery to the Space Force, and significant Senate funding for NASA missions.
SL-4 R/B (06857)
COSPAR: 1973-070B | Alt Name: Voskhod 21-145 Blok-I
DECAYED
Image
Additional Sources
Launch Details
Launch Date
October 3, 1973
Launch Site
PLMSC
Launch Pad
LC41/1
Launch Vehicle
Voskhod 11A57
Orbital Elements
NORAD ID
06857
International Designator
1973-070B
Decay Date
10/9/1973
Explore in the Catalog
Basic Satellite Info
Name
SL-4 R/B
Alternative Name
Voskhod 21-145 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
11A57I
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 26 Aug 2024
Today's briefing covers an exciting new satellite launch, a significant reentry, and unexpected space debris from a fragmentation event.
Space Brief 5 Jul 2025
Today's space highlights include China's first classified Shiyan-28B launch, Boeing's major satellite contract, new NASA budget allocations, and plans for shuttle Discovery's relocation.
Space Brief 19 May 2025
Today's space brief covers new ultraviolet data from the Europa Clipper, challenges in managing space debris, quantum advances in satellite technology, as well as a failed Indian satellite launch and more.
Pentagon Reveals Space & Cyber "First Mover" Role in Iran Operations | KeepTrack Space Brief
Space & Cyber Command disrupted Iran ops as US munition stockpiles drop. Space Force shifts to commercial ground stations & faces acquisition workforce gaps.
SpaceX Launches 13th NRO Proliferated Architecture Mission | KeepTrack Space Brief
Falcon 9 successfully deployed NROL-72 for National Reconnaissance Office's 13th proliferated architecture mission. Low-Earth orbit intelligence constellation expanding since 2021.
X Report 28 Oct 2025
SpaceX successfully launched 28 Starlink satellites and settled a lawsuit, while Starlink's performance faces scrutiny in Ukraine. Additionally, MTN is enhancing Starlink's business services.
Space Brief 24 Nov 2025
Today's highlights include a record number of launches from Florida's Space Coast, Germany's new military space strategy, SpaceX's Starlink deployment, and more.