SL-4 R/B (35941)

COSPAR: 2009-053B | Alt Name: Soyuz-FG No. 029 Blok-I
DECAYED

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

Launch Date

September 30, 2009

Launch Pad

LC1

Launch Vehicle

Soyuz-FG

Orbital Elements

NORAD ID

35941

International Designator

2009-053B

Decay Date

10/4/2009

Basic Satellite Info

Name

SL-4 R/B

Alternative Name

Soyuz-FG No. 029 Blok-I

Type

Rocket Body

Status

Space Junk

Owner

KVR

Country

Russia

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

12.6373

Visual Magnitude

Unknown

Color

Unknown

Material Composition

Unknown

Technical Details

Payload

11S510

Purpose

Unknown

Mission

Unknown

Manufacturer

PROGT

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 28 Sep 2025

Space Brief 28 Sep 2025

Today's highlights include China's latest satellite launches, Blue Origin's expansion plans, and Purdue University's groundbreaking suborbital mission with Virgin Galactic.

Space Brief 6 Sep 2025

Space Brief 6 Sep 2025

Today's brief covers China's latest experimental launch to GEO and new commercial satellites, insights from hyperspectral imagery on underground structures, and the Space Force's material testing for Mars missions.

The Moon Landing That Almost Didn't Happen

The Moon Landing That Almost Didn't Happen

Six hours behind schedule, with a backup engine system shuddering in lunar orbit and mission controllers in Houston running out of options, Apollo 16 came within one meeting of being sent home without landing. The problem was a wobble in a gimbal. The solution was math done under pressure.

Van Allen Probe A Reenters March 10 After 14 Years | KeepTrack Space Brief

Van Allen Probe A Reenters March 10 After 14 Years | KeepTrack Space Brief

NASA's Van Allen Probe A (1,300 lbs) reenters today after 14 years studying Earth's radiation belts. Most debris will burn up; ocean impact statistically likely.

X Report 11 Dec 2025

X Report 11 Dec 2025

SpaceX has confirmed plans for an IPO and successfully launched multiple batches of Starlink satellites, advancing its mission for global internet coverage.

Space Brief 9 Oct 2025

Space Brief 9 Oct 2025

Today's briefing covers key developments in defense budgets reshaping the space sector, significant Space Force contracts, and the latest news from the Chinese space station.

The 300,000 Swerves Keeping Low Earth Orbit From Crashing

The 300,000 Swerves Keeping Low Earth Orbit From Crashing

Starlink satellites fired their thrusters to dodge a collision roughly 300,000 times in 2025, about 822 times a day. Behind that number is a fragile, half-automated system of warnings, probabilities, and judgment calls that decides which close approaches are worth a maneuver and which are just noise.

X Report 24 Mar 2025

X Report 24 Mar 2025

SpaceX sets a rocket re-use record, Starlink satellites continue to proliferate, and Botswana launches its first national satellite.