X Report 30 Apr 2025
SpaceX achieves a remarkable milestone with its 50th Falcon 9 launch of 2025, while Starlink continues to expand, facing competition from China's megaconstellation efforts.
SL-4 R/B (40668)
COSPAR: 2015-027B | Alt Name: Soyuz-2-1a 72-171 Blok-I
DECAYED
Image
Additional Sources
Launch Details
Launch Date
June 5, 2015
Launch Site
PLMSC
Launch Pad
LC43/4
Launch Vehicle
Soyuz-2-1A
Orbital Elements
NORAD ID
40668
International Designator
2015-027B
Decay Date
6/9/2015
Basic Satellite Info
Name
SL-4 R/B
Alternative Name
Soyuz-2-1a 72-171 Blok-I
Type
Rocket Body
Status
Space Junk
Owner
RVSNR
Country
Russia
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
13.0429
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
14S54/RD-0110 374BL02A
Purpose
Unknown
Mission
Unknown
Manufacturer
PROGT
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.
The Day When Cassini Chose the Long Way Home
Cassini's Titan T-115 encounter marked the moment the spacecraft stopped looking down and started looking sideways, trading one type of science for another as it entered the final chapter of an iconic mission.
SpaceX Acquires xAI, Starlink Bypasses Iran Internet Blackouts | KeepTrack Space Brief
SpaceX acquires xAI to develop orbital data centers. Starlink terminals bypass Iran's government internet blackouts. Blue Origin escalates defense procurement criticism.
X Report 11 Mar 2025
A week of highs and lows for SpaceX, including weather-related delays and a return to Falcon launches.
SpaceX IPO Raises $75B, SPCX Surges 20% on Day One | KeepTrack X Report
SpaceX debuted on Nasdaq as SPCX at $135/share, raising a record $75B and pushing Elon Musk's net worth past $1 trillion for the first time.
SpaceX Files Confidential IPO at $1.75T Valuation | KeepTrack X Report
SpaceX confidentially files for a record-breaking IPO targeting a $1.75T valuation and $80B raise, while a Starlink satellite breaks apart in orbit.
X Report 22 Aug 2025
SpaceX successfully launched the U.S. Space Force's eighth X-37B spaceplane mission while preparing for an upcoming Starship launch. Meanwhile, the company continues to expand its Starlink satellite constellation.
Space Brief 4 Feb 2025
Today's brief covers the expansion of the U.S. missile defense shield, a new contract for Viasat from the U.S. Space Force, and the Missile Defense Agency's call for innovative Iron Dome concepts.