SL-4 R/B (16680)

COSPAR: 1986-029B | Alt Name: Soyuz-U 21-332 Blok-I
DECAYED

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

Launch Date

April 15, 1986

Launch Site

PLMSC

Launch Pad

LC16/2

Launch Vehicle

Soyuz-U

Orbital Elements

NORAD ID

16680

International Designator

1986-029B

Decay Date

4/27/1986

Basic Satellite Info

Name

SL-4 R/B

Alternative Name

Soyuz-U 21-332 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 Force Gets $26B in Defense Bill, Golden Dome Initiative Funded | KeepTrack Space Brief

Space Force Gets $26B in Defense Bill, Golden Dome Initiative Funded | KeepTrack Space Brief

Space Force allocated $26B in 2026 defense appropriations backing Golden Dome initiative. FY26 defense bill adds $8B but sidelines $28B munitions request. First Qatari-Emirati joint defense venture formed.

Space Brief 10 Dec 2025

Space Brief 10 Dec 2025

Today's brief covers China's intense launch schedule, a new Arctic military constellation, Muon Space's defense innovations, and SpaceX's classified NROL-77 mission.

Tianlong-3 Fails on Debut; SpaceX Wins $178.5M Space Force Contract | KeepTrack Space Brief

Tianlong-3 Fails on Debut; SpaceX Wins $178.5M Space Force Contract | KeepTrack Space Brief

China's Tianlong-3 rocket failed during ascent on debut launch Friday. SpaceX secured $178.5M Space Force contract for missile tracking satellite launches beginning 2027.

Space Brief 9 Jul 2025

Space Brief 9 Jul 2025

Today's brief covers the U.S. Space Force's new international strategy, Northrop Grumman's Golden Dome project, and ULA's Vulcan launches, alongside military budget priorities.

The Moon Landing That Almost Didn't Happen

The Moon Landing That Almost Didn't Happen

Six hours behind schedule, with a backup engine system shuddering in lunar orbit and mission controllers in Houston running out of options, Apollo 16 came within one meeting of being sent home without landing. The problem was a wobble in a gimbal. The solution was math done under pressure.

Space Brief 21 Sep 2025

Space Brief 21 Sep 2025

Today's Space Brief covers a significant signals intelligence launch, a record-breaking satellite deployment in China, a glimpse into the newest stealth drone, a potential delay for NASA's lunar lander, and more exciting updates from satellite world.

Space Brief 25 Nov 2024

Space Brief 25 Nov 2024

Today's brief highlights the need for better space debris management, multiple SpaceX Starlink launches, and NASA's upcoming lunar cargo delivery plans.

X Report 11 Mar 2025

X Report 11 Mar 2025

A week of highs and lows for SpaceX, including weather-related delays and a return to Falcon launches.