DISCOVERER 21 (00084)

COSPAR: 1961-006A | Alt Name: Discoverer 21
DECAYED

Image
DISCOVERER 21 Satellite Image
Additional Sources
Launch Details

Launch Date

February 18, 1961

Launch Site

AFWTR

Launch Pad

75-3-5

Launch Vehicle

Thor Agena B

Orbital Elements

NORAD ID

00084

International Designator

1961-006A

Decay Date

4/20/1962

Basic Satellite Info

Name

DISCOVERER 21

Alternative Name

Discoverer 21

Type

Payload

Status

Decayed

Owner

AFBMD/ARPA

Country

United States

Constellation

N/A

Related Satellites

Major Events

N/A

Summary

Apologies, there is no summary for this satellite yet. I am working to generate these for every object in the catalog, but it is going to take time.

Physical Characteristics

Length

2

Diameter

1.5

Span

2

Dry Mass

146

Launch Mass

146

Shape

Cone

Radar Cross Section

Unknown

Visual Magnitude

Unknown

Color

Unknown

Material Composition

Unknown

Technical Details

Payload

CORONA RM-2

Purpose

Unknown

Mission

Unknown

Manufacturer

LMSD

Life Expectancy

Unknown

Bus

CORONA

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 30 Nov 2024

X Report 30 Nov 2024

SpaceX executes dual Starlink launches and secures Dragonfly mission contract while managing NRO satellite deployment.

Space Brief 30 Mar 2025

Space Brief 30 Mar 2025

Today's highlights include Rocket Lab joining the US Space Force's national security launch program, SpaceX's upcoming Starlink deployment, China's successful EVA, and intriguing science aboard SpaceX's Fram2 mission.

FCC Approves Reflect Orbital Sunlight Satellite | KeepTrack Space Brief

FCC Approves Reflect Orbital Sunlight Satellite | KeepTrack Space Brief

FCC clears Reflect Orbital's first satellite to bounce sunlight into nighttime zones, despite pushback from astronomers concerned about orbital streaking and wildlife impacts.

X Report 26 Aug 2025

X Report 26 Aug 2025

SpaceX's ongoing challenges with the Starship Flight 10 launch are prominent today, as weather and technical issues continue to push back the schedule. Meanwhile, successful cargo missions to the ISS highlight the company's ongoing commitment to space operations.

Pentagon Pulls the Plug on GPS OCX | The $8 Billion Ground System That Never Worked

Pentagon Pulls the Plug on GPS OCX | The $8 Billion Ground System That Never Worked

On April 17, 2026, the U.S. Space Force officially cancelled the Next Generation Operational Control System after sixteen years of development, cost overruns, and testing failures. The $8 billion program was supposed to unlock the military's encrypted GPS signal. Instead, the satellites are flying with capabilities the ground can't command.

X Report 25 Apr 2025

X Report 25 Apr 2025

SpaceX launches Starlink satellites successfully, while Starbase inches closer to city status and business discussions intensify.

Starship Flight 12 Targets May 19 with Redesigned Ship | KeepTrack X Report

Starship Flight 12 Targets May 19 with Redesigned Ship | KeepTrack X Report

SpaceX targets May 19 for Starship Flight 12 debut, while CRS-34 delivers 6,500 lbs of cargo to ISS aboard a Falcon 9.

Starlink Constellation Size Nears 10,000, X Report 16 Mar 2026

Starlink Constellation Size Nears 10,000, X Report 16 Mar 2026

Starlink constellation size in March 2026: 9,996 satellites in orbit and 9,986 working from 11,504 launched, as SpaceX deorbits legacy V1.0 hardware.