SL-4 R/B (16000)

COSPAR: 1985-078B | Alt Name: Soyuz-U 56-828 Blok-I
DECAYED

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

Launch Date

August 29, 1985

Launch Pad

LC31

Launch Vehicle

Soyuz-U

Orbital Elements

NORAD ID

16000

International Designator

1985-078B

Decay Date

9/4/1985

Basic Satellite Info

Name

SL-4 R/B

Alternative Name

Soyuz-U 56-828 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

1

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.

New Glenn Damaged in Hotfire Anomaly at LC-36 | KeepTrack Space Brief

New Glenn Damaged in Hotfire Anomaly at LC-36 | KeepTrack Space Brief

Blue Origin's New Glenn suffered a damaging anomaly during hotfire testing at Launch Complex 36, grounding the heavy-lift rocket indefinitely with no return-to-flight timeline announced.

X Report 8 May 2025

X Report 8 May 2025

SpaceX launches 28 more Starlink satellites while addressing conflicts of interest and expanding home connectivity with a new router.

X Report 24 Feb 2025

X Report 24 Feb 2025

SpaceX faces challenges with a Falcon 9 reentry issue, while continuing to expand its Starlink constellation with new launches.

X Report 7 Oct 2025

X Report 7 Oct 2025

SpaceX successfully launched 28 Starlink satellites on October 7, further expanding its broadband constellation while hosting an active launch schedule this week.

Crew-11 Medical Evacuation Set for January 14, Starlink Mission Succeeds | KeepTrack X Report

Crew-11 Medical Evacuation Set for January 14, Starlink Mission Succeeds | KeepTrack X Report

NASA confirms first-ever ISS medical evacuation for January 14 via Crew Dragon. SpaceX launches 29 Starlink satellites in third mission of 2026. Artemis 2 moon mission timeline unaffected.

X Report 22 Nov 2025

X Report 22 Nov 2025

Major challenges emerged with SpaceX's next-generation Starship booster testing, while Starlink deployments continued with successful launches.

Starlink Crosses 10,000 Active Satellites, X Report 18 Mar 2026

Starlink Crosses 10,000 Active Satellites, X Report 18 Mar 2026

Starlink satellite count 2026: SpaceX tops 10,000 active satellites, 10,037 working of 11,558 launched, under seven years after first launch.

Space Brief 7 Nov 2025

Space Brief 7 Nov 2025

Today's brief highlights a landmark cooperation between NASA and China to prevent satellite collision, strategic steps in American space leadership through nuclear energy, a U.S. military missile test, and more.