SL-4 R/B (11284)

COSPAR: 1979-019B | Alt Name: Soyuz-U 25-926 Blok-I
DECAYED

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

Launch Date

February 27, 1979

Launch Site

PLMSC

Launch Pad

LC43/3

Launch Vehicle

Soyuz-U

Orbital Elements

NORAD ID

11284

International Designator

1979-019B

Decay Date

3/2/1979

Basic Satellite Info

Name

SL-4 R/B

Alternative Name

Soyuz-U 25-926 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.

Space Brief 27 Oct 2024

Space Brief 27 Oct 2024

Today's brief covers SpaceX's latest Starlink launch, updates on Crew-8's return, and preparations for the SLS Artemis II mission.

Space Brief 2 Sep 2024

Space Brief 2 Sep 2024

Key topics: SpaceX resumes Falcon 9 launches, mysterious Starliner sounds, and upcoming space policy events. Detailed tracking info for EGYPTSAT A.

25 Starlinks Lift Off from Vandenberg in Latest Batch | KeepTrack X Report

25 Starlinks Lift Off from Vandenberg in Latest Batch | KeepTrack X Report

SpaceX launched 25 more Starlink satellites from Vandenberg SFB on March 8, 2026, pushing the active constellation toward 9,914 working spacecraft.

X Report 12 Nov 2025

X Report 12 Nov 2025

SpaceX breaks records with its 94th launch of the year while planning to ramp up Starship production to unprecedented levels.

Space Brief 20 Aug 2024

Space Brief 20 Aug 2024

Polaris Dawn's upcoming commercial spacewalk, successful lunar orbit by Chinese spacecraft, and more space news including SpaceX's Starlink mission, RFA's static-fire failure, and advances in satellite technology.

Boeing Starliner Faces New Setbacks, Stranding NASA Astronauts on ISS

Boeing Starliner Faces New Setbacks, Stranding NASA Astronauts on ISS

Boeing's Starliner spacecraft encounters thruster problems and helium leaks during its first crewed mission, potentially delaying the return of NASA astronauts from the International Space Station.

X Report 20 Jan 2025

X Report 20 Jan 2025

SpaceX continues to push forward with its ambitious plans as the FAA investigates Starship debris reports, while Starlink maintains robust satellite operations.

NASA Pressures Blue Origin on HLS After New Glenn Explosion | KeepTrack Space Brief

NASA Pressures Blue Origin on HLS After New Glenn Explosion | KeepTrack Space Brief

NASA demands Blue Origin find alternate launcher for Artemis moon landers after New Glenn test explosion damaged Cape Canaveral LC-36. Schedule risk to lunar missions.