SL-12 R/B(2) (21536)

COSPAR: 1991-046D | Alt Name: Blok DM-2 No. 50L

Image
SL-12 R/B(2) Satellite Image
Additional Sources
Launch Details

Launch Date

July 1, 1991

Launch Pad

LC200/39

Launch Vehicle

Proton-K/DM-2

Orbital Elements

NORAD ID

21536

International Designator

1991-046D

Epoch

Sat, 04 Jul 2026 04:26:06 GMT

Apogee

Calculating...

Perigee

Calculating...

Inclination

12.81°

Right Ascension

338.43°

Eccentricity

Calculating...

Argument of Perigee

251.00°

Period

1426.81 min

Mean Motion

1.01 rev/day

Latitude

Calculating...

Longitude

Calculating...

Altitude

Calculating...

Velocity

Calculating...

Polar Plot
3D Visualization
Basic Satellite Info

Name

SL-12 R/B(2)

Alternative Name

Blok DM-2 No. 50L

Type

Rocket Body

Status

Space Junk

Owner

RVSN

Country

USSR

Constellation

N/A

Related Satellites

Major Events

N/A

Latest TLEs
1 21536U 91046D   26185.18479675  .00000062  00000-0  00000-0 0  9994
2 21536  12.8096 338.4266 0015337 250.9955 290.6511  1.00924396123971

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

6.3

Diameter

3.7

Span

6.3

Dry Mass

2440

Launch Mass

17490

Shape

Cyl

Radar Cross Section

2.312

Visual Magnitude

Unknown

Color

Unknown

Material Composition

Unknown

Technical Details

Payload

11S861 No. 50L

Purpose

Unknown

Mission

Unknown

Manufacturer

NPOE

Life Expectancy

Unknown

Bus

Blok DM

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.

B1067 Flies Record 36th Mission on Starlink 10-42 | KeepTrack X Report

B1067 Flies Record 36th Mission on Starlink 10-42 | KeepTrack X Report

Booster B1067 sets a new Falcon 9 reuse record on its 36th flight, lifting Starlink 10-42 from Cape Canaveral at 5:25 a.m. EDT.

The Day America's Moon Rocket Began Its Journey

The Day America's Moon Rocket Began Its Journey

Fifty-nine years ago, a revolutionary new rocket thundered skyward from Cape Kennedy, testing the spacecraft that would eventually carry astronauts to the lunar surface

X Report 20 Apr 2025

X Report 20 Apr 2025

SpaceX is preparing for significant infrastructure expansion in Texas and Florida to support Starship, launches its third NRO mission in a week, and faces regulatory scrutiny from the Bahamas.

Space Brief 7 May 2025

Space Brief 7 May 2025

Today's briefing focuses on key developments in military space activities, technological advancements, and strategic challenges faced by the U.S. in space dominance. Notably, the Space Force is expanding its missile warning capabilities, and significant funding discussions are underway.

X Report 17 Dec 2025

X Report 17 Dec 2025

SpaceX prepares for a busy launch schedule with key upgrades at Starbase and notable Starlink missions. Recent close approaches in orbit underscore the complexities of satellite operations.

Starlink Restrictions Disrupt Russian Battlefield Communications | KeepTrack Space Brief

Starlink Restrictions Disrupt Russian Battlefield Communications | KeepTrack Space Brief

Starlink restrictions reportedly hit Moscow's drone coordination and frontline comms. SpaceX and xAI enter Pentagon's $100M drone contest. Sentinel ICBM to clear key review this year.

Space Brief 6 Nov 2024

Space Brief 6 Nov 2024

Discover the latest in satellite technology with the launch of the world's first wooden satellite, new test materials for the ISS, and significant developments in orbital space debris.

Space Brief 17 Sep 2025

Space Brief 17 Sep 2025

Highlights include China's recent satellite launch, advancements in nuclear propulsion, non-kinetic tech developments for maritime defense, SpaceX's direct-to-device spectrum tests, and maneuvering satellites for Space Force missions.