Space Brief 9 May 2025
Today's briefing covers new satellite projects, military tech advancements, and insights into missile defense strategies. Discover partnerships in satellite design and exciting developments in space military technology.
SL-4 R/B (19987)
COSPAR: 1989-036B | Alt Name: Soyuz-U 35-876 Blok-I
DECAYED
Image
Additional Sources
Launch Details
Launch Date
May 17, 1989
Launch Site
Launch Pad
LC1
Launch Vehicle
Soyuz-U
Orbital Elements
NORAD ID
19987
International Designator
1989-036B
Decay Date
5/21/1989
Basic Satellite Info
Name
SL-4 R/B
Alternative Name
Soyuz-U 35-876 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
18.73
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 9 Sep 2024
Today's Space Brief explores new satellite launches, significant reentries, funding milestones, and critical policy updates.
Space Brief 20 Oct 2025
Today's Space Brief highlights Innospace's upcoming orbital launch, SpaceX's record-setting Starlink mission, China's Thousand Sails constellation, Atomic-6's new space armor, and developments in SpaceX's West Coast facilities.
The Day the Navy's Eyes Reached Orbit
Forty-two years ago, an Atlas H rocket climbed into the California sky carrying four objects that would help the U.S. Navy track every Soviet warship on the planet - a mission so secret that even the satellites' true name wasn't declassified until 2023
Artemis 2 Crew Returns After 50-Year Lunar Flyby | KeepTrack Space Brief
Artemis 2 astronauts completed first crewed lunar flyby since Apollo 17, traveling 690,000 miles aboard Orion. Four crew validated deep-space systems.
Space Brief 29 Mar 2025
Key military and technology developments in space; US Space Force and Army strategize national security with new rocket certifications and space training initiatives.
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.
X Report 14 Mar 2025
SpaceX advances pre-launch tests amid Starlink deployment surge and strategic expansions in Texas.