2 Starshield Sats Fly on Rare Public Mission | KeepTrack X Report
SpaceX publicly confirmed 2 Starshield government satellites launched from Vandenberg on June 6, a rare disclosure for the classified Starlink variant.
SL-4 R/B (20137)
COSPAR: 1989-056B | Alt Name: Soyuz-U No. 594 Blok-I
DECAYED
Image
Additional Sources
Launch Details
Launch Date
July 18, 1989
Launch Site
Launch Pad
LC1
Launch Vehicle
Soyuz-U
Orbital Elements
NORAD ID
20137
International Designator
1989-056B
Decay Date
7/21/1989
Basic Satellite Info
Name
SL-4 R/B
Alternative Name
Soyuz-U No. 594 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
12.5
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 4 Nov 2025
Tesla's Cybertruck fleet integrates with SpaceX operations at Starbase, showcasing synergy between Musk's companies.
Space Brief 8 Jan 2025
Today's highlights include China's launch of Shijian-25 for on-orbit refueling tests, Pentagon's investment in defense technologies, and key military upgrades.
Space Brief 25 Dec 2025
Today's highlights include the Pentagon's report on China's military buildup, Innospace's upcoming launch plans, Starlink's rapid growth, China's significant space strides in 2025, and India's successful deployment of BlueBird 6.
SpaceX Launches GPS Satellite in Third Mission Reassigned From ULA | KeepTrack Space Brief
SpaceX launches GPS satellite for Space Force — third consecutive GPS mission reassigned from ULA. Space Force nears selection of next-gen GEO spy satellite contractors. Northwood Space lands $49M deal.
Space Brief 29 Sep 2025
Today's Space Brief discusses significant military satellite launches, groundbreaking agreements for lunar nuclear power, and Italy's satellite strategy dilemma. Additionally, we cover the Dream Chaser's upcoming demonstration flight and new Pentagon contracts for rocket motor production.
Starship Florida Launch Targeting 2026 | KeepTrack X Report
SpaceX is pushing to launch Starship from Cape Canaveral before end of 2026, with contractors ramping work at LC-39A.
New Glenn Explodes After USSF Awards Blue Origin Security Contract | KeepTrack Space Brief
New Glenn rocket exploded hours after U.S. Space Force and NRO awarded Blue Origin a national security launch task order. Stand-down and mishap investigation expected.