SL-4 R/B (19757)

COSPAR: 1989-002B | Alt Name: Soyuz-U No. 580 Blok-I
DECAYED

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

Launch Date

January 12, 1989

Launch Site

PLMSC

Launch Pad

LC16/2

Launch Vehicle

Soyuz-U

Orbital Elements

NORAD ID

19757

International Designator

1989-002B

Decay Date

1/14/1989

Basic Satellite Info

Name

SL-4 R/B

Alternative Name

Soyuz-U No. 580 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

35.6

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.

X Report 5 Dec 2025

X Report 5 Dec 2025

SpaceX made significant strides with the launch of 28 Starlink satellites while navigating regulatory challenges regarding rural broadband funding. Additionally, developments on the Crew Dragon mission continue to evolve with a change in cosmonaut assignment.

The Korean Optical Wide-field patroL-Network (OWL-Net)

The Korean Optical Wide-field patroL-Network (OWL-Net)

South Korea's sophisticated network of robotic telescopes provides critical space situational awareness while strengthening the nation's position in space security amid regional tensions

X Report 21 Jul 2025

X Report 21 Jul 2025

SpaceX successfully launched 24 Starlink satellites into polar orbit, enhancing global coverage. Meanwhile, NASA's Crew-11 is now in quarantine ahead of their upcoming ISS mission.

Space Brief 7 Mar 2025

Space Brief 7 Mar 2025

Key insights from the latest SpaceX Starship breakup, the establishment of a new satellite mobile service, and enhancing America's missile shield capabilities through satellites.

SpaceMobile-006 (BlueBird 6)

SpaceMobile-006 (BlueBird 6)

The largest commercial antenna ever deployed in low Earth orbit belongs to a company most people have never heard of. AST SpaceMobile's BlueBird 6 is either the future of cellular connectivity or the most ambitious overreach in telecom history - and it just finished unfolding.

Starship Flight 13 Targets July 16 Launch | KeepTrack X Report

Starship Flight 13 Targets July 16 Launch | KeepTrack X Report

SpaceX targets July 16 for Starship Flight 13 from Starbase, aiming to fix Flight 12 issues and deploy working Starlink satellites.

X Report 24 Aug 2025

X Report 24 Aug 2025

SpaceX successfully launched its CRS-33 Dragon cargo mission to the ISS, while preparations for the upcoming Starship Flight 10 continue, highlighting significant advancements in both cargo operations and test flight reliability.

X Report 3 Jun 2025

X Report 3 Jun 2025

SpaceX gears up for an exciting week with multiple launches, including a crewed mission and the rescheduled Starlink delivery. Meanwhile, ULA faces criticism from the Space Force over delays in its Vulcan rocket program.