SL-12 R/B(AUX MOTOR) (13903)

COSPAR: 1983-020C | Alt Name: D-1-7L SOZ-2

DECAYED

Image

Additional Sources

Launch Details

Launch Date

March 23, 1983

Launch Site

Tyuratam Missile and Space Complex

Launch Pad

LC200/39

Launch Vehicle

Proton-K/D-1

Orbital Elements

NORAD ID

13903

International Designator

1983-020C

Decay Date

8/5/1985

Basic Satellite Info

Name

SL-12 R/B(AUX MOTOR)

Alternative Name

D-1-7L 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

Launch Mass

120

Shape

Cyl

Radar Cross Section

1.583

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.

Falcon Heavy Returns | A Six-Ton Bet on Geostationary Broadband

Falcon Heavy flew for the first time in eighteen months on April 29, 2026, expending its center core to push Viasat's final ViaSat-3 satellite toward geostationary orbit. The mission is a flagship rocket doing what only it can still do, for an operator betting six tons of high-throughput hardware on a market Starlink is rapidly redefining.

X Report 18 Dec 2024

SpaceX achieves significant milestones with Starship and multiple launch missions, while Starlink connectivity expands through T-Mobile's beta program.

Space Brief 17 Feb 2025

Today's brief covers the first astronaut with a disability preparing for the ISS mission, SpaceX’s recent Starlink launch, funding breakthroughs for satellite tech company K2 Space, and updates on the Artemis program's challenges.

The Day America Sent Two Secrets to the Sky

Sixty-five years ago, America launched two very different space missions within hours of each other - one broadcast live to a fascinated nation, the other quietly reaching orbit from a fog-shrouded California launchpad while no one was watching

X Report 21 Nov 2025

SpaceX celebrates significant milestones with its 100th launch of the year, enhancing Starlink's coverage while preparing for an escalating Starship production cadence.

Space Brief 7 Jul 2025

Today's key topics include the halting of the U.S. Air Force's rocket landing pad plans, the Space Force's shift to a flexible satellite strategy, delays in Australia's Eris 1 rocket launch, and the controversial cut of satellite sea-ice data to climate scientists.

GAO Warns Space Force Satellite Costs Rising, Workforce Cuts Add Risk | KeepTrack Space Brief

GAO flags growing cost problems across Space Force satellite portfolio with workforce reductions compounding risks to missile-warning constellations like NGG and SWAT.

Space Brief 29 Apr 2025

Today's space brief covers significant advancements in military counter-drone capabilities, workforce challenges in the Navy related to DOGE budget cuts, and highlights Germany's rise in defense spending. We also shine a spotlight on the communications satellite INTELSAT 901.