SL-4 R/B (11650)

COSPAR: 1979-106B | Alt Name: Soyuz-U 47-760 Blok-I

DECAYED

Image

Additional Sources

Launch Details

Launch Date

December 28, 1979

Launch Site

PLMSC

Launch Pad

LC43/3

Launch Vehicle

Soyuz-U

Orbital Elements

NORAD ID

11650

International Designator

1979-106B

Decay Date

12/31/1979

Basic Satellite Info

Name

SL-4 R/B

Alternative Name

Soyuz-U 47-760 Blok-I

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

6.7

Diameter

2.7

Span

6.7

Dry Mass

2350

Launch Mass

2350

Shape

Cyl

Radar Cross Section

Unknown

Visual Magnitude

Unknown

Color

Unknown

Material Composition

Unknown

Technical Details

Payload

11S510

Purpose

Unknown

Mission

Unknown

Manufacturer

PROG

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.

Pentagon Pauses LEO Constellation as Acquisition Reviews Continue | KeepTrack Space Brief

Pentagon puts LEO constellation layers on hold during acquisition review. SpaceX and xAI join $100M autonomous drone contest. China's Zenk Space completes first stage static fire.

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.

Space Brief 16 Dec 2024

Today's briefing covers the ULA's military application for Vulcan's upper stage, FAA's efforts to expedite launch licensing, and a fascinating flyby of Mercury by BepiColombo.

Space Brief 21 Aug 2024

Recent Starlink launches, autonomous navigation for satellite swarms, major funding for asteroid mining, and insights into NASA's various projects and developments.

Space Force Awards Orbital AMTI to 9 Companies | KeepTrack Space Brief

Space Force confirmed 9 companies won orbital Air Moving Target Indication contracts. Capability shifts airborne surveillance to satellites for expanded coverage and survivability.

X Report 12 Nov 2025

SpaceX breaks records with its 94th launch of the year while planning to ramp up Starship production to unprecedented levels.

STARLINK-4621 Faces Critical Conjunction as Eight Satellites Reenter | KeepTrack X Report

A HIGH-risk conjunction between STARLINK-4621 and the defunct SL-18 rocket body leads the July 11 safety picture, with eight Starlink satellites set to reenter through July 14.

Space Brief 16 Aug 2025

Today's brief covers ULA's new mission for the US Space Force, China's moon rocket test, delays in the DARC radar system, and SpaceX's Starlink launches.