Space Brief 21 Nov 2025
Today's brief covers the Space Force's strategic roadmap, a groundbreaking DARPA mission in Very Low Earth Orbit, and enhanced cyber defenses due to AI-driven threats.
SL-4 R/B (31394)
COSPAR: 2007-017B | Alt Name: Soyuz-U-PVB No. 104 Blok-I
DECAYED
Image
Additional Sources
Launch Details
Launch Date
May 12, 2007
Launch Site
Launch Pad
LC1
Launch Vehicle
Soyuz-U-PVB
Orbital Elements
NORAD ID
31394
International Designator
2007-017B
Decay Date
5/15/2007
Basic Satellite Info
Name
SL-4 R/B
Alternative Name
Soyuz-U-PVB No. 104 Blok-I
Type
Rocket Body
Status
Space Junk
Owner
KVR
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
8.0991
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
11S510
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.
Starlink Satellites Dominate Earth's Orbit
SpaceX's Starlink constellation has grown at an astonishing rate, now accounting for over 20% of all trackable objects in orbit. With plans for tens of thousands more, Starlink is on the cusp of forever changing the landscape of Earth's near-space environment.
Space Brief 3 Sep 2025
Today's Space Brief delves into NASA's lunar nuclear power initiative, a strategic Army data integration project, and a rare SpaceX Falcon booster launch. Also covered are significant advancements in military satellite technology and Navy unmanned surface vehicles.
Starship V3 Targets April 2026 Debut, X Report 20 Mar 2026
Starship V3 targets an April 2026 debut, the ride for next-gen Starlink V3 satellites. Fleet stands at 10,062 working of 11,587 launched.
Crew-11 Medical Evacuation Set for January 14, Starlink Mission Succeeds | KeepTrack X Report
NASA confirms first-ever ISS medical evacuation for January 14 via Crew Dragon. SpaceX launches 29 Starlink satellites in third mission of 2026. Artemis 2 moon mission timeline unaffected.
FCC Approves Reflect Orbital Sunlight Satellite | KeepTrack Space Brief
FCC clears Reflect Orbital's first satellite to bounce sunlight into nighttime zones, despite pushback from astronomers concerned about orbital streaking and wildlife impacts.
Booster 19 Return Imminent as Pad 2 Refinements Continue | KeepTrack X Report
SpaceX is finalizing Pad 2 upgrades at Starbase ahead of Booster 19's return flight, as Starlink's active constellation holds at 10,185 satellites.
Space Brief 9 Dec 2025
Today's edition covers significant military space developments, including DIU tech consolidation discussions, NDAA budget expansions, and new military commands.