SL-4 R/B (04873)

COSPAR: 1971-004B | Alt Name: Voskhod (N145) Blok-I
DECAYED

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

Launch Date

January 21, 1971

Launch Pad

LC31

Launch Vehicle

Voskhod 11A57

Orbital Elements

NORAD ID

04873

International Designator

1971-004B

Decay Date

1/26/1971

Basic Satellite Info

Name

SL-4 R/B

Alternative Name

Voskhod (N145) 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

11A57I

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.

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.

The Looming Crisis of Orbital Debris

The Looming Crisis of Orbital Debris

As humanity increasingly relies on satellites, the escalating space junk problem poses a dire threat to our space-based infrastructure. With debris counts reaching alarming levels, urgent action is needed to prevent a cascade of collisions that could make key orbits unusable.

SpaceX Launches 29 Starlink Satellites From Cape Canaveral | KeepTrack X Report

SpaceX Launches 29 Starlink Satellites From Cape Canaveral | KeepTrack X Report

SpaceX deploys 29 Starlink satellites from Cape Canaveral on the Starlink 6-100 mission. Falcon 9 lifted off at 6:31 p.m. EST continuing SpaceX's dominant satellite internet market position.

Space Brief 27 Sep 2025

Space Brief 27 Sep 2025

Today's brief covers next-generation missile defense strategies, NASA's Dream Chaser contract updates, and technological advances in Air Force cyber defense.

Space Situational Awareness (SSA)

Space Situational Awareness (SSA)

How our ability to track and predict objects in orbit has become the foundation of space safety in an increasingly crowded cosmic neighborhood

Space Brief 24 Jun 2025

Space Brief 24 Jun 2025

Today's top space events include a new military satellite launch by York Space, advancements in phased array antennas by Space Force, and the debut of Denmark's Arctic satellite. Also covered are developments in Starlink's services in Vietnam.

Space Brief 27 Aug 2025

Space Brief 27 Aug 2025

Today's key space events include SpaceX's launch of the secretive X-37B military drone, XTAR's U.S. defense market strategy, and China's space station AI upgrade.

Shenzhou-23 Docks at Tiangong; Crew Member Targets 1-Year Stay | KeepTrack Space Brief

Shenzhou-23 Docks at Tiangong; Crew Member Targets 1-Year Stay | KeepTrack Space Brief

Shenzhou-23 docked with Tiangong May 24 with 3 astronauts, including Hong Kong's first crew member. One will stay ~1 year in orbit.