M-3S2 R/B (21695)

COSPAR: 1991-062B | Alt Name: M-3S2-6 Stage 3
DECAYED

Image
M-3S2 R/B Satellite Image
Additional Sources
Launch Details

Launch Date

August 30, 1991

Launch Site

KSCUT

Launch Pad

M1

Launch Vehicle

Mu-3S-II

Orbital Elements

NORAD ID

21695

International Designator

1991-062B

Decay Date

5/2/2014

Basic Satellite Info

Name

M-3S2 R/B

Alternative Name

M-3S2-6 Stage 3

Type

Rocket Body

Status

Space Junk

Owner

ISASS

Country

Japan

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

2.7

Diameter

1.5

Span

2.7

Dry Mass

310

Launch Mass

310

Shape

Sphere + Cone

Radar Cross Section

2.8943

Visual Magnitude

Unknown

Color

Unknown

Material Composition

Unknown

Technical Details

Payload

M-3B

Purpose

Unknown

Mission

Unknown

Manufacturer

NISS

Life Expectancy

Unknown

Bus

M-3B

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 22 Dec 2025

X Report 22 Dec 2025

SpaceX celebrates a year of industry milestones, including the successful deployment of Starlink satellites and innovative advancements in rocket technology.

Space Brief 17 Dec 2025

Space Brief 17 Dec 2025

Today's stories cover Rocket Lab's innovative DiskSat launch, Digantara's expansion to missile defense, and DARPA's satellite surveillance network expansion, among other updates in military and satellite technology.

Artemis 2 Crewed Lunar Flyby Scheduled for April 1 | KeepTrack Space Brief

Artemis 2 Crewed Lunar Flyby Scheduled for April 1 | KeepTrack Space Brief

NASA's Artemis II launches 4 astronauts on lunar flyby April 1. Soyuz-5 inaugural flight confirmed for April 3. Space warfare doctrines shift toward agentic AI for faster decision loops.

Space Brief 24 Nov 2024

Space Brief 24 Nov 2024

Today's briefing covers Blue Origin's New Glenn nearing its first launch, SpaceX's 400th Falcon 9 mission with Starlink satellites, advancements in space-based weather prediction, and more.

X Report 27 Mar 2025

X Report 27 Mar 2025

SpaceX successfully launches 27 Starlink satellites and gains approval for internet services in Vietnam.

X Report 28 Mar 2025

X Report 28 Mar 2025

SpaceX sees another successful Starlink launch and faces strategic contract discussions as NASA pivots to reliable Dragon missions.

Space Brief 24 Dec 2025

Space Brief 24 Dec 2025

Today's highlights include the successes and setbacks in recent rocket launches, a notable satellite anomaly, and a significant expansion announcement from ESA.

SpaceX Stock Jumps 19% on Nasdaq Debut, X Report 15 Jun 2026

SpaceX Stock Jumps 19% on Nasdaq Debut, X Report 15 Jun 2026

SpaceX stock surged 19% on its Nasdaq debut as Musk targets $1 trillion revenue by 2030. Starlink 17-54 marks the 1,500th satellite launched in 2026.