SL-4 R/B (10604)

COSPAR: 1978-008B | Alt Name: Soyuz-U No. 075 Blok-I

DECAYED

Image

Additional Sources

Launch Details

Launch Date

January 20, 1978

Launch Site

Tyuratam Missile and Space Complex

Launch Pad

LC31

Launch Vehicle

Soyuz-U

Orbital Elements

NORAD ID

10604

International Designator

1978-008B

Decay Date

1/23/1978

Basic Satellite Info

Name

SL-4 R/B

Alternative Name

Soyuz-U No. 075 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.

NASA Ends MAVEN After 6-Month Contact Loss; Falcon 9 Sets 35th Reuse Record | KeepTrack Space Brief

NASA concludes MAVEN mission after six months attempting to restore contact with Mars probe. Meanwhile, Falcon 9 booster flies record 35th flight on Starlink 10-35 mission.

Iran Strikes UAE and Saudi Targets, Space Force Opens Tracking to Commercial Firms | KeepTrack Space Brief

Iran launches drones and missiles at UAE and Saudi targets. Space Force opens secretive tracking data to commercial firms. Falcon 9 breakup linked to lithium pollution in upper atmosphere.

SpaceX Launches CAS500-2 and 44 Rideshares, Space Brief 3 May 2026

SpaceX CAS500-2 launch success: Falcon 9 flew May 3 at 0700 UTC from Vandenberg with South Korea's imaging satellite and 44 rideshare payloads.

The Day When Cassini Chose the Long Way Home

Cassini's Titan T-115 encounter marked the moment the spacecraft stopped looking down and started looking sideways, trading one type of science for another as it entered the final chapter of an iconic mission.

Space Brief 26 Nov 2025

Today's update covers new military space initiatives, impacts of drone threats in Europe, and advancements in secure cloud technology for NATO and Ukraine.

X Report 30 Nov 2025

SpaceX successfully launched the Transporter-15 mission, deploying 140 payloads, while Elon Musk addressed media narratives related to Starlink's humanitarian efforts following recent disasters.

X Report 12 Dec 2024

SpaceX progresses with Starship developments and sets sights on NASA's upcoming 3D sky-mapping satellite launch.

X Report 29 Nov 2025

SpaceX successfully launched the Transporter-15 rideshare mission, deploying 140 payloads including significant international contributions. Meanwhile, the company progresses with Booster 19 stacking after the recent Booster 18 anomaly.