CelesTrak.org
An in-depth look at CelesTrak, the leading non-profit provider of orbital element sets and collision assessment tools, trusted by space professionals worldwide.
SL-4 R/B (06833)
COSPAR: 1973-066B | Alt Name: Soyuz-U 43-732 Blok-I
DECAYED
Image
Additional Sources
Launch Details
Launch Date
September 21, 1973
Launch Site
PLMSC
Launch Pad
LC43/3
Launch Vehicle
Soyuz-U
Orbital Elements
NORAD ID
06833
International Designator
1973-066B
Decay Date
9/28/1973
Basic Satellite Info
Name
SL-4 R/B
Alternative Name
Soyuz-U 43-732 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.
X Report 23 Oct 2025
SpaceX continues to break records with its Falcon 9 missions while facing public scrutiny from Elon Musk regarding NASA's leadership. Meanwhile, satellite spectrum battles heat up as Lynk Global and Omnispace prepare to merge.
Space Force Gets $26B in Defense Bill, Golden Dome Initiative Funded | KeepTrack Space Brief
Space Force allocated $26B in 2026 defense appropriations backing Golden Dome initiative. FY26 defense bill adds $8B but sidelines $28B munitions request. First Qatari-Emirati joint defense venture formed.
X Report 20 Aug 2025
SpaceX makes significant strides with Starship Flight Test 10 approved and updates on the new Starbase pad design.
X Report 23 Sep 2025
SpaceX successfully launched the NROL-48 mission, growing the National Reconnaissance Office's satellite fleet. Additionally, NASA introduced ten new astronaut candidates, increasing female representation in its ranks.
Space Brief 3 Aug 2025
Today's brief covers NASA's collaboration with India for a new Earth-tracking satellite, China's expansion of its satellite internet network, and a groundbreaking cosmic shield for solar cells. Also highlighted are EchoStar's ambitious satellite order and Roscosmos' recent diplomatic moves.
Space Brief 9 Nov 2025
Today's top stories include SpaceX's latest Starlink launch, Blue Origin's FAA exemption request, and major acquisitions by Intuitive Machines and Firefly Aerospace shaping the defense and space landscape.
Space Brief 29 Dec 2025
Today's highlights include Japan's new military satellite imagery initiative, NASA's SPHEREx map, and AST BlueBird 6's groundbreaking cellular array in low Earth orbit.