X Report 22 Jun 2025
Key updates include the impending Falcon 9 launch for Transporter-14, insights on Starship's explosion, and a last-minute abort of the Starlink 10-23 mission.
SL-4 R/B (20755)
COSPAR: 1990-073B | Alt Name: Soyuz-U-PVB 53-150 Blok-I
DECAYED
Image
Additional Sources
Launch Details
Launch Date
August 16, 1990
Launch Site
PLMSC
Launch Pad
LC43/4
Launch Vehicle
Soyuz-U-PVB
Orbital Elements
NORAD ID
20755
International Designator
1990-073B
Decay Date
8/18/1990
Basic Satellite Info
Name
SL-4 R/B
Alternative Name
Soyuz-U-PVB 53-150 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
5.8
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.
Katalyst Link Clears Tests for $500M SPARCS Rescue | KeepTrack Space Brief
Katalyst's Link spacecraft passes key testing milestone ahead of June 2026 launch to rescue NASA's $500M SPARCS telescope. In-space servicing mission will create trackable conjunction risk during approach and docking phase.
Blue Origin Rebuilds New Glenn Launch Pad, Space Brief 19 Jun 2026
Blue Origin launch pad rebuild begins at Cape Canaveral after the New Glenn explosion, targeting return to flight by end of 2026. SpaceX flies NROL-179.
ISS Crew Shelters in Dragon During Active Air Leak | KeepTrack X Report
ISS astronauts evacuated to a SpaceX Dragon capsule on June 5 as cosmonauts worked to seal a persistent air leak on the Russian segment.
Transporter-16 Lofts 119 Payloads to SSO | KeepTrack X Report
SpaceX's Falcon 9 launches 119 payloads on Transporter-16, the 21st smallsat rideshare mission, from Vandenberg SFB at 1102 UTC.
X Report 19 Dec 2024
SpaceX secures FAA license for Starship Flight 7 and plans to establish Starbase as a city. Firefly and ispace are set to share a Falcon 9 launch. Plus, new Starlink services launch in New Zealand.
X Report 18 Nov 2025
SpaceX successfully launched the Sentinel-6B satellite to monitor global sea levels while resuming daytime rocket launches. Furthermore, delays in the Starship timeline impact NASA's Artemis 3 mission schedule.
Rocket Lab Neutron Targets Q4 2026 Debut, Space Brief 9 May 2026
Rocket Lab Neutron's first launch is targeted for Q4 2026 after a tank test failure, backed by a new 5-launch deal. Plus Globalstar's 1,410 km refresh.