X Report 20 Apr 2025
SpaceX is preparing for significant infrastructure expansion in Texas and Florida to support Starship, launches its third NRO mission in a week, and faces regulatory scrutiny from the Bahamas.
SL-12 R/B(AUX MOTOR) (21794)
COSPAR: 1991-079F | Alt Name: DM2-51L SOZ-2
DECAYED
Image
Additional Sources
Launch Details
Launch Date
November 22, 1991
Launch Site
Launch Pad
LC81/23
Launch Vehicle
Proton-K/DM-2
Orbital Elements
NORAD ID
21794
International Designator
1991-079F
Decay Date
10/15/1996
Basic Satellite Info
Name
SL-12 R/B(AUX MOTOR)
Alternative Name
DM2-51L SOZ-2
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
1.1
Diameter
0.5
Span
1.1
Dry Mass
60
Launch Mass
120
Shape
Cyl
Radar Cross Section
0.795
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
SOZ
Purpose
Unknown
Mission
Unknown
Manufacturer
NPOE
Life Expectancy
Unknown
Bus
SOZ
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.
Vietnam Licenses Starlink for 600K Terminals, Isaacman Plans Roscosmos Visit | KeepTrack Space Brief
Vietnam approves Starlink with up to 600,000 terminals and 4 gateway stations. SpaceX hits 600th Falcon 9 launch. NASA's Isaacman plans Roscosmos meeting and Soyuz visit.
Demystifying the USSPACECOM Two-Line Element Set Format
Discover the history and significance of Two-Line Element Sets (TLEs) in satellite tracking. Dive into their components, applications, and how they are evolving to meet future space challenges.
X Report 7 May 2025
SpaceX achieves significant milestones with a successful Falcon 9 launch carrying 28 Starlink satellites and receives FAA approval for increased Starship launches, amidst challenges posed by India's new satellite regulations.
Artemis 2 Crew Returns After 50-Year Lunar Flyby | KeepTrack Space Brief
Artemis 2 astronauts completed first crewed lunar flyby since Apollo 17, traveling 690,000 miles aboard Orion. Four crew validated deep-space systems.
X Report 27 Aug 2025
SpaceX successfully completes a critical test flight of its Starship vehicle while gearing up for another Starlink satellite launch, showcasing significant advancements in their launch capabilities.
Space Brief 10 Dec 2025
Today's brief covers China's intense launch schedule, a new Arctic military constellation, Muon Space's defense innovations, and SpaceX's classified NROL-77 mission.
GPS III SV10 Launches on Falcon 9, X Report 20 Apr 2026
GPS III SV10 launched April 21 on a SpaceX Falcon 9 with 3x better accuracy and 8x anti-jamming. Starlink stands at 10,263 working satellites.