User-Inspired Update
A user suggestion led to the addition of new visualizations for satellites, debris, and unidentified objects across different orbits in KeepTrack.
SL-12 PLAT (15146)
COSPAR: 1984-078C | Alt Name: Perekhodnik
DECAYED
Image
Additional Sources
Launch Details
Launch Date
August 1, 1984
Launch Site
Launch Pad
LC200/40
Launch Vehicle
Proton-K/DM
Orbital Elements
NORAD ID
15146
International Designator
1984-078C
Decay Date
8/2/1984
Basic Satellite Info
Name
SL-12 PLAT
Alternative Name
Perekhodnik
Type
Debris
Status
Space Junk
Owner
RVSN
Country
USSR
Constellation
N/A
Related Satellites
Major Events
N/A
Summary
Space debris, also known as space junk, encompasses all non-functional objects orbiting Earth such as defunct satellites, spent rocket stages, and fragments from collisions or disintegrations. Over time, this debris can accumulate and create an increasingly hazardous environment in orbit. Even tiny fragments, traveling at extremely high velocities, can inflict significant damage on operational satellites and spacecraft. If left unmanaged, the density of debris raises the risk of catastrophic collisions and further fragmentation, compounding the problem and threatening the safety and sustainability of space activities.
Physical Characteristics
Length
4
Diameter
3.7
Span
4
Dry Mass
800
Launch Mass
800
Shape
Cyl
Radar Cross Section
Unknown
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
Sredniy perekhodnik
Purpose
Unknown
Mission
Unknown
Manufacturer
ZIKH
Life Expectancy
Unknown
Bus
Adapter
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.
NASA Declares MAVEN Dead; Eastern Range Damage Assessment Underway | KeepTrack Space Brief
NASA officially ended the MAVEN Mars orbiter mission after months of radio silence following an anomaly. Space Force assessing Eastern Range damage from separate incident affecting launch cadence.
Pentagon $50B Iran Supplemental Drives Space Spending Surge | KeepTrack Space Brief
Pentagon's $50B Iran supplemental request signals major investment in missile defense and ISR satellites. Amazon reshuffles LEO government leadership amid Kuiper competition.
SpaceX Launches NROL-105 Spy Satellite in First 2026 National Security Mission | KeepTrack X Report
SpaceX launches NROL-105 spy satellite from Vandenberg — first national security mission of 2026. Crew-11 astronauts arrive in Houston after historic first-ever ISS medical evacuation.
X Report 7 Nov 2025
SpaceX successfully launched 28 Starlink satellites while EchoStar enhances its stake in the company through a $2.6 billion spectrum deal, amid growing demands for space domain awareness.
Space Brief 4 Jul 2025
Explore today's key space events including China's satellite launch, ULA's Vulcan rocket preparations, significant budget bills from Congress, and discussions on lunar business prospects.
X Report 9 Dec 2025
SpaceX successfully launched 29 Starlink satellites on the record-breaking 32nd flight of its Falcon 9 rocket. Elon Musk discusses a potential future as a Type II civilization, emphasizing the role of AI and satellite technology.
The Day a Rocket Changed Space Policy Forever
Thirty years ago, a Chinese rocket veered off course two seconds after liftoff, destroyed a village, and triggered a political scandal that reshaped how the United States controls space technology to this day