SL-4 R/B (11516)

COSPAR: 1979-079B | Alt Name: Soyuz-U 47-444 Blok-I
DECAYED

Image
SL-4 R/B Satellite Image
Additional Sources
Launch Details

Launch Date

August 31, 1979

Launch Site

PLMSC

Launch Pad

LC43/4

Launch Vehicle

Soyuz-U

Orbital Elements

NORAD ID

11516

International Designator

1979-079B

Decay Date

9/9/1979

Basic Satellite Info

Name

SL-4 R/B

Alternative Name

Soyuz-U 47-444 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.

Space Brief 23 May 2025

Space Brief 23 May 2025

Today's briefing highlights a significant increase in the Pentagon's AI budget, upgrades at the Tiangong space station, cyber threats to satellite operations, and the Moon and Venus conjunction.

The Civilian Space Traffic System America Almost Didn't Build

The Civilian Space Traffic System America Almost Didn't Build

For nearly two decades, the U.S. Air Force and Space Force have been the world's unofficial civilian space traffic control system. The Department of Commerce's Traffic Coordination System for Space (TraCSS) is now taking over that job for commercial satellite operators - in stages, against persistent congressional pressure to kill the program, and with Department of Defense advocates pushing to make it happen before it is too late.

FAA Grounds Starship V3 for Mishap Probe, X Report 29 May 2026

FAA Grounds Starship V3 for Mishap Probe, X Report 29 May 2026

FAA grounds Starship pending a mishap investigation into the V3 debut flight; return to flight hinges on FAA sign-off. Starlink 10-53 added 29 sats.

Space Brief 23 Oct 2025

Space Brief 23 Oct 2025

Today's updates cover Vantor's satellites overcoming tracking challenges, a startup's ambitious missile defense test, and more pivotal space events.

Space Brief 10 Sep 2024

Space Brief 10 Sep 2024

Today’s Space Brief covers a rescued lunar orbiter, a thorough pre-launch check for a Jupiter-bound mission, and leadership changes in a satellite communication company. We also spotlight a recently launched CubeSat and an innovative act of deorbiting.

SpaceX Eyes Confidential IPO Filing at $1.75T Valuation | KeepTrack X Report

SpaceX Eyes Confidential IPO Filing at $1.75T Valuation | KeepTrack X Report

Reports suggest SpaceX considering confidential IPO filing this March at $1.75T+ valuation. Starship may not fly on NASA's revamped Artemis 3 mission. 25 Starlink sats launched.

Musk Pivots SpaceX Focus to Moon Settlement Before Mars | KeepTrack X Report

Musk Pivots SpaceX Focus to Moon Settlement Before Mars | KeepTrack X Report

Elon Musk shifts SpaceX's priority to lunar settlement before Mars colonization. Crew-12 launch delayed by weather to Feb 12. SpaceX partners with Hexagon Purus for manufacturing.

York Space Goes Public at $629M, Cold War JUMPSEAT Spy Satellites Declassified | KeepTrack Space Brief

York Space Goes Public at $629M, Cold War JUMPSEAT Spy Satellites Declassified | KeepTrack Space Brief

York Space raises $629M in IPO to expand satellite manufacturing. NRO declassifies Cold War-era JUMPSEAT spy satellites. Lockheed to boost THAAD interceptor production from 96 to 400 per year.