SL-4 R/B (16927)

COSPAR: 1986-066B | Alt Name: Soyuz-U 48-351 Blok-I
DECAYED

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

Launch Date

September 3, 1986

Launch Pad

LC31

Launch Vehicle

Soyuz-U

Orbital Elements

NORAD ID

16927

International Designator

1986-066B

Decay Date

9/25/1986

Basic Satellite Info

Name

SL-4 R/B

Alternative Name

Soyuz-U 48-351 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.

Six Missions Worth Watching After Artemis II

Six Missions Worth Watching After Artemis II

Artemis II grabbed the headlines, but six other missions are quietly approaching milestones that could reshape what we know about Mercury, Mars, asteroids, exoplanets, and the Moon's south pole. Here is what is actually happening with each of them.

Artemis 2 Crew Arrives for April 1 Lunar Flyby Launch | KeepTrack Space Brief

Artemis 2 Crew Arrives for April 1 Lunar Flyby Launch | KeepTrack Space Brief

Artemis 2 astronauts arrive at KSC for April 1 launch. Four-person crew will fly lunar free-return trajectory, first crewed lunar mission since Apollo 17 in 1972.

Space Brief 3 Feb 2025

Space Brief 3 Feb 2025

Today's brief covers SpaceX's continued Starlink expansions, Japan's successful Michibiki satellite launch, and challenges faced by India's navigation satellite. Stay updated on crucial satellite events and launches.

X Report 31 Mar 2025

X Report 31 Mar 2025

New experiments in space agriculture begin with Fram2 mission, a historic polar orbit flight, and a Starlink launch postponement.

Space Brief 21 Nov 2025

Space Brief 21 Nov 2025

Today's brief covers the Space Force's strategic roadmap, a groundbreaking DARPA mission in Very Low Earth Orbit, and enhanced cyber defenses due to AI-driven threats.

Starship V3 Debut Slips as Booster 19 Rolls to Pad 2 | KeepTrack X Report

Starship V3 Debut Slips as Booster 19 Rolls to Pad 2 | KeepTrack X Report

Starship V3's maiden flight is delayed as SpaceX rolls Booster 19 to Pad 2 for Flight 9, while Falcon 9 completes its 30th mission of 2026.

Space Brief 9 Apr 2025

Space Brief 9 Apr 2025

Today's brief covers Blue Origin’s new defense launch contracts, the ISS launch of a Navy SEAL astronaut, Sierra Space’s GPS security advancements for the U.S. Space Force, and the Space Force's 'Orbital Watch' initiative.

Space Brief 9 Nov 2025

Space Brief 9 Nov 2025

Today's top stories include SpaceX's latest Starlink launch, Blue Origin's FAA exemption request, and major acquisitions by Intuitive Machines and Firefly Aerospace shaping the defense and space landscape.