SL-4 R/B (11488)

COSPAR: 1979-074B | Alt Name: Soyuz-U 55-929 Blok-I

DECAYED

Image

Additional Sources

Launch Details

Launch Date

August 14, 1979

Launch Site

PLMSC

Launch Pad

LC43/3

Launch Vehicle

Soyuz-U

Orbital Elements

NORAD ID

11488

International Designator

1979-074B

Decay Date

8/18/1979

Basic Satellite Info

Name

SL-4 R/B

Alternative Name

Soyuz-U 55-929 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.

Second Starlink Satellite Generates Debris; Falcon 9 Booster Flies 34th Mission | KeepTrack Space Brief

Second Starlink satellite malfunctioned on orbit and generated debris within three months of prior event. Falcon 9 booster completed record 34th mission from Cape Canaveral.

All 33 Raptor V3 Engines Ignite in Super Heavy Static Fire | KeepTrack X Report

SpaceX ignited all 33 next-gen Raptor V3 engines on the Super Heavy booster at Starbase, Texas, marking a critical milestone toward the next Starship flight.

SpaceX Lofts 45 Payloads Including Korean CAS500-2 | KeepTrack X Report

SpaceX's Falcon 9 rideshare lifted 45 satellites including South Korea's CAS500-2 Earth observer from Vandenberg at 0700 UTC May 3.

The Pentagon's Mystery Spaceplane Takes Off

On April 22, 2010, an Atlas V lifted off from Cape Canaveral carrying a reusable robotic spaceplane so secret that the Air Force would not even confirm its mission duration. It came back 224 days later, lighter, quieter, and more operational than anyone outside Washington had expected. Fifteen years later, the X-37B is still flying, and the military still will not say what it does.

Space Brief 3 Mar 2025

Historic moon landing by Firefly Aerospace, Spanish Air and Space Force advances with new simulator, and spotlight on OneWeb's communication satellite.

Space Brief 8 Oct 2025

Today's brief covers key developments in satellite launches, missile defense strategies, advanced IoT satellite connectivity, and the projected growth of the satellite market driven by defense needs.

SpaceX to Lower 4,400 Starlink Satellite Orbits for Space Safety | KeepTrack X Report

SpaceX plans to lower orbits of 4,400 Starlink satellites after two collision-concern incidents. Cosmo-SkyMed Earth observation satellite launched for Italy from Vandenberg.

SpaceX and xAI Tapped for Pentagon's $100M Drone Contest | KeepTrack X Report

Pentagon selects SpaceX and xAI for $100M autonomous drone competition. Two Falcon 9 rockets launch Starlink sats from California and Florida. 11,215 total Starlink satellites launched.