SL-4 R/B (15637)

COSPAR: 1985-027B | Alt Name: Soyuz-U 46-312 Blok-I

DECAYED

Image

Additional Sources

Launch Details

Launch Date

April 3, 1985

Launch Site

Tyuratam Missile and Space Complex

Launch Pad

LC31

Launch Vehicle

Soyuz-U

Orbital Elements

NORAD ID

15637

International Designator

1985-027B

Decay Date

4/21/1985

Basic Satellite Info

Name

SL-4 R/B

Alternative Name

Soyuz-U 46-312 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

75.06

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 Force Awards First-Ever $52M Satellite Deorbit Contract to Starfish Space | KeepTrack Space Brief

Space Force awards first-of-its-kind $52M contract to Starfish Space for deorbiting defunct satellites. AST SpaceMobile selected for Missile Defense Agency SHIELD program. $26B Space Force budget confirmed.

X Report 25 Jul 2025

SpaceX successfully launched NASA's TRACERS mission while Starlink faced a brief global outage, affecting users worldwide.

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

Starship Flight 12 Targets Mid-May Launch, X Report 2 May 2026

Starship Flight 12 status for May 2026: SpaceX targets mid-May with a revised trajectory, while Starlink 10-38 lofts 29 satellites from Cape Canaveral.

X Report 25 Dec 2024

SpaceX wraps up a record-breaking year with successful launches and advancements in Starlink mega-constellation.

Space Brief 12 Jul 2025

Today's focus spans from major military training initiatives in orbit to key updates on drone policies and crucial satellite launches.

Space Brief 18 Apr 2025

Today's highlights include a Minotaur IV launch of U.S. spy satellites, Rocket Lab's new defense contracts, and the unveiling of Space Force's warfighting framework. Plus, the Satellite Spotlight dives into METEOR 3-1.

X Report 14 Feb 2025

Starship testing progresses at the Cape; Lynk Global secures funding amidst rising satellite competition.