X Report 28 Jul 2025
SpaceX continues its ambitious satellite deployment schedule with two successful Starlink launches in just 24 hours, enhancing global connectivity.
SL-4 R/B (15590)
COSPAR: 1985-019B | Alt Name: Soyuz-U 32-797 Blok-I
DECAYED
Image
Additional Sources
Launch Details
Launch Date
March 1, 1985
Launch Site
PLMSC
Launch Pad
LC41/1
Launch Vehicle
Soyuz-U
Orbital Elements
NORAD ID
15590
International Designator
1985-019B
Decay Date
3/4/1985
Basic Satellite Info
Name
SL-4 R/B
Alternative Name
Soyuz-U 32-797 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.
SpaceMobile-006 (BlueBird 6)
The largest commercial antenna ever deployed in low Earth orbit belongs to a company most people have never heard of. AST SpaceMobile's BlueBird 6 is either the future of cellular connectivity or the most ambitious overreach in telecom history - and it just finished unfolding.
SpaceX Eyes $60B Cursor AI Acquisition Ahead of IPO | KeepTrack X Report
SpaceX secured a $60B option to acquire Cursor AI while launching its 40th Falcon 9 mission of 2026, deploying 24 more Starlink satellites from Vandenberg.
X Report 29 Nov 2024
SpaceX advances Starship development while planning future replacements for Falcon and Dragon.
Space Brief 29 May 2025
Today's brief covers a Japanese military satellite launch, new GPS satellite orders by the Space Force, and a Moog propulsion system contract, among other notable developments.
Space Brief 8 Oct 2025
Today's brief covers key developments in satellite launches, missile defense strategies, advanced IoT satellite connectivity, and the projected growth of the satellite market driven by defense needs.
X Report 1 Dec 2025
SpaceX celebrates significant milestones with the launch of Falcon 9 and developments in the Starship program, while Elon Musk addresses media narratives surrounding Starlink's humanitarian efforts.
Long March 10B Debut Highlights 4-Launch Week | KeepTrack Week in Review
This week: China's Long March 10B debuted successfully, SpaceX merged with xAI, and Starlink topped 10,775 satellites in orbit.