SL-4 R/B (08031)

COSPAR: 1975-065B | Alt Name: Soyuz-U No. 017 Blok-I
DECAYED

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

Launch Date

July 15, 1975

Launch Pad

LC1

Launch Vehicle

Soyuz-U

Orbital Elements

NORAD ID

08031

International Designator

1975-065B

Decay Date

7/17/1975

Basic Satellite Info

Name

SL-4 R/B

Alternative Name

Soyuz-U No. 017 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.

ESA Buys Dedicated Crew Dragon Mission for 4 Astronauts | KeepTrack X Report

ESA Buys Dedicated Crew Dragon Mission for 4 Astronauts | KeepTrack X Report

ESA is purchasing a dedicated SpaceX Crew Dragon flight to send 4 European astronauts to the ISS ahead of the station's planned retirement.

China Opens 2026 With Yaogan and Guowang Satellite Launches | KeepTrack Space Brief

China Opens 2026 With Yaogan and Guowang Satellite Launches | KeepTrack Space Brief

China launches Yaogan spacecraft into unusual orbit and Guowang constellation satellites to start 2026. NASA and DOE plan lunar nuclear reactor by 2030. Space Force switches GPS launch rocket.

Space Brief 24 Sep 2025

Space Brief 24 Sep 2025

Key highlights on China's reusable rocket developments, U.S. military's Tranche 1 satellite launch, Space Force's weapons acquisition strategies, and more.

Space Brief 24 Dec 2025

Space Brief 24 Dec 2025

Today's highlights include the successes and setbacks in recent rocket launches, a notable satellite anomaly, and a significant expansion announcement from ESA.

Space Brief 4 Apr 2025

Space Brief 4 Apr 2025

Today's highlights include the release of a mystery object by Russian military satellites, SpaceX Fram2 mission insights, Amazon's upcoming satellite launch, and more.

Space Brief 6 Oct 2025

Space Brief 6 Oct 2025

Today's highlights include Firefly's acquisition of SciTec, DARPA's vision for a moon economy, and ESA's new deep space antenna in Australia. Stay updated on the latest in space intelligence and defense technology transformations, plus noteworthy rogue planet phenomena.

JSC Vimpel

JSC Vimpel

An analysis of Russia's independent space tracking system and how it compares to the established U.S. Space Surveillance Network

X Report 4 Aug 2025

X Report 4 Aug 2025

SpaceX achieves significant milestones with the launch of 28 Starlink satellites and the final landing of the LZ-1 pad, marking key moments in their ongoing mission to expand satellite connectivity.