SL-4 R/B (15646)

COSPAR: 1985-029B | Alt Name: Soyuz-U No. 128 Blok-I
DECAYED

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

Launch Date

April 16, 1985

Launch Site

PLMSC

Launch Pad

LC41/1

Launch Vehicle

Soyuz-U

Orbital Elements

NORAD ID

15646

International Designator

1985-029B

Decay Date

5/10/1985

Basic Satellite Info

Name

SL-4 R/B

Alternative Name

Soyuz-U No. 128 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

65.07

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.

Virgin Galactic's Upcoming "Galactic 06" Spaceflight

Virgin Galactic's Upcoming "Galactic 06" Spaceflight

On January 26, 2024, Virgin Galactic's "Galactic 06" mission will launch, marking its 11th spaceflight.

X Report 2 Nov 2025

X Report 2 Nov 2025

SpaceX successfully completed its 100th Starlink mission of the year and launched the 'Haven Demo' private space station along with 17 other satellites. The company also made strides in lunar lander development for Artemis III.

The Details of Apollo 1

The Details of Apollo 1

How a catastrophic fire in 1967 fundamentally altered NASA's approach to human spaceflight and continues to influence modern spacecraft design

X Report 16 Nov 2025

X Report 16 Nov 2025

SpaceX successfully launched 29 Starlink satellites on November 14, marking the first of two rapid-fire Falcon 9 missions from Florida's Space Coast in under four hours.

AT&T, Verizon, T-Mobile Unite vs Starlink D2D, X Report 18 May 2026

AT&T, Verizon, T-Mobile Unite vs Starlink D2D, X Report 18 May 2026

Starlink direct-to-device competition unites AT&T, Verizon, and T-Mobile for the first time as SpaceX's 10,354 working satellites reshape mobile coverage.

The Evolution of Space Stations

The Evolution of Space Stations

A brief journey through the evolution of space stations, delving into Russia's Mir, the International Space Station, China's Tiangong, and envisioning the future of orbital habitats.

Deep Space Advanced Radar Capability (DARC)

Deep Space Advanced Radar Capability (DARC)

How a groundbreaking radar network is transforming our ability to monitor threats in deep space while strengthening international security partnerships

SpaceX Wins $57M Golden Dome Satellite Crosslink Deal | KeepTrack Space Brief

SpaceX Wins $57M Golden Dome Satellite Crosslink Deal | KeepTrack Space Brief

SpaceX secures $57 million military contract for Link-182 satellite crosslink demo supporting Golden Dome missile defense. Also joins software working group.