SL-8 R/B (20104)

COSPAR: 1989-050B | Alt Name: Kosmos-3M 61-250 Stage 2

Image
SL-8 R/B Satellite Image
Additional Sources
Launch Details

Launch Date

July 4, 1989

Launch Site

PLMSC

Launch Pad

LC133/3

Launch Vehicle

Kosmos 11K65M

Orbital Elements

NORAD ID

20104

International Designator

1989-050B

Epoch

Sat, 04 Jul 2026 02:44:14 GMT

Apogee

Calculating...

Perigee

Calculating...

Inclination

82.95°

Right Ascension

239.12°

Eccentricity

Calculating...

Argument of Perigee

289.12°

Period

104.53 min

Mean Motion

13.78 rev/day

Latitude

Calculating...

Longitude

Calculating...

Altitude

Calculating...

Velocity

Calculating...

Polar Plot
3D Visualization
Basic Satellite Info

Name

SL-8 R/B

Alternative Name

Kosmos-3M 61-250 Stage 2

Type

Rocket Body

Status

Space Junk

Owner

RVSN

Country

USSR

Constellation

N/A

Related Satellites

Major Events

N/A

Latest TLEs
1 20104U 89050B   26185.11405819  .00000114  00000-0  98997-4 0  9992
2 20104  82.9550 239.1195 0042055 289.1202  70.5405 13.77621268859217

Source: Celestrak

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

4.2

Diameter

2.4

Span

4.2

Dry Mass

1434

Launch Mass

1434

Shape

Cyl

Radar Cross Section

4.4044

Visual Magnitude

Unknown

Color

Unknown

Material Composition

Unknown

Technical Details

Payload

S3M

Purpose

Unknown

Mission

Unknown

Manufacturer

OAZ

Life Expectancy

Unknown

Bus

S3

Configuration

Unknown

Motor

Unknown

Equipment

Unknown

Power System

Unknown

ADCS

Unknown

Transmitter Frequency

Unknown

Map
This tool will help you track the satellite's position and predict its upcoming passes over your location. Simply input the coordinates or click the geolocation button to get started.
Next Pass
Azimuth Elevation Time (Local)
Start Azimuth
Max Elevation
Stop Azimuth
Time Until
Pass Duration

Satellite Articles

View All Posts »

Learn more about satellites and other related topics.

Voyager 1

Voyager 1

In November 2023, Earth's most distant spacecraft started speaking gibberish. Five months, one dead memory chip, and 30 billion miles of round-trip troubleshooting later, engineers got it talking again - using code written before most of them were born.

Space Brief 23 May 2025

Space Brief 23 May 2025

Today's briefing highlights a significant increase in the Pentagon's AI budget, upgrades at the Tiangong space station, cyber threats to satellite operations, and the Moon and Venus conjunction.

The $1.5 Million Starlink Jammer That Ukraine Keeps Blowing Up

The $1.5 Million Starlink Jammer That Ukraine Keeps Blowing Up

Russia's Volna Kupol Garant electronic warfare system was purpose-built to jam Starlink. It costs around $1.5 million per unit, covers just 20 square kilometers, and can only target one satellite at a time. Ukraine has been finding and destroying them within days of deployment.

X Report 24 Jun 2025

X Report 24 Jun 2025

SpaceX successfully launched the Transporter-14 mission, adding multiple payloads, including Canadian satellites and a memorial capsule, while Starlink expands its services in Vietnam and enhances T-Mobile's reach.

Space Force Buys Second Otter Spacecraft for On-Orbit Servicing | KeepTrack Space Brief

Space Force Buys Second Otter Spacecraft for On-Orbit Servicing | KeepTrack Space Brief

Space Force procures second Otter spacecraft for satellite repositioning. Momentus and NASA sign Space Act Agreement for orbital servicing tests. Pentagon delays contractor review.

Reentry

Reentry

What happens when space objects come home: the fiery physics of returning from orbit and why predicting where debris lands is so difficult

X Report 31 Oct 2025

X Report 31 Oct 2025

SpaceX prepares for its 100th Starlink launch while refining its lunar lander design for NASA's Artemis program amidst calls for architectural changes.

X Report 8 Aug 2025

X Report 8 Aug 2025

SpaceX celebrates its 100th launch of the year with a Falcon 9 mission carrying Amazon's Project Kuiper satellites, while Crew-10 prepares for its return from the ISS and the company expands its interplanetary ambitions with new Mars partnerships.