# Ranger 3

> US spaceprobe to the Moon

**Wikidata**: [Q609623](https://www.wikidata.org/wiki/Q609623)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Ranger_3)  
**Source**: https://4ort.xyz/entity/ranger-3

## Summary
Ranger 3 was a United States space probe launched in 1962 as part of the Ranger program, intended to transmit images of the Moon during a flyby. However, due to a launch vehicle malfunction, it missed the Moon and became an artificial satellite of the Sun.

## Key Facts
- Launched on January 26, 1962, from Cape Canaveral Launch Complex 12.
- Part of the Ranger program, managed by the Jet Propulsion Laboratory.
- Launched aboard an Atlas-Agena B rocket.
- COSPAR ID: 1962-001A; NSSDCA ID: 1962-001A.
- Became an artificial satellite of the Sun after failing to reach the Moon.
- Follows Ranger 2 and was succeeded by Ranger 4.
- Orbit decay occurred on January 28, 1962.

## FAQs
### Q: What was the purpose of Ranger 3?
A: Ranger 3 was designed to fly by the Moon and capture high-resolution images during its approach. It was part of NASA's early lunar exploration efforts under the Ranger program.

### Q: Why didn’t Ranger 3 reach the Moon?
A: A malfunction in the Atlas-Agena B launch vehicle caused Ranger 3 to miss the Moon. As a result, it entered a heliocentric orbit instead of impacting the lunar surface.

### Q: Who operated Ranger 3?
A: The mission was operated by the Jet Propulsion Laboratory (JPL), which managed the Ranger program for NASA.

## Why It Matters
Ranger 3 represents an early milestone in American attempts at lunar reconnaissance during the Space Race. Although it failed to achieve its primary objective, it contributed valuable engineering experience that informed future missions in the Ranger series and beyond. Its failure highlighted critical challenges in interplanetary navigation and spacecraft control, ultimately aiding in the refinement of techniques used in later successful lunar probes like Ranger 7, which returned the first close-up images of the Moon’s surface.

## Notable For
- One of the earliest U.S. attempts at lunar imaging via flyby.
- First in the Ranger program to completely miss the Moon due to a guidance system issue.
- Became an artificial satellite of the Sun rather than impacting the Moon.
- Provided lessons crucial to improving trajectory accuracy in subsequent Ranger missions.
- Demonstrated the importance of redundancy and precision in deep-space navigation systems.

## Body
### Mission Overview
Ranger 3 was developed as part of NASA's Ranger program, aimed at obtaining close-up images of the Moon before crashing into its surface. Managed by the Jet Propulsion Laboratory, the mission sought to test technologies essential for future planetary exploration.

### Launch Details
- **Launch Date:** January 26, 1962  
- **Launch Site:** Cape Canaveral Launch Complex 12  
- **Launch Vehicle:** Atlas-Agena B  

The launch proceeded nominally until a timing error in the spacecraft’s onboard computer caused it to fire its mid-course correction thrusters incorrectly, leading to a significant deviation from its planned trajectory.

### Trajectory and Outcome
Due to the incorrect thruster firing, Ranger 3 passed approximately 36,793 km (22,862 miles) above the Moon’s surface—far too distant to fulfill its scientific objectives. Instead of impacting the Moon, it entered a heliocentric orbit, becoming an artificial satellite of the Sun.

- **Time of Orbit Decay:** January 28, 1962  
- **Significant Events:** Rocket launch (January 26, 1962); atmospheric entry (January 28, 1962)

Despite the failure, telemetry data collected during the flight helped engineers identify flaws in the guidance system, contributing to improvements in later Ranger missions.

### Technical Specifications
- **Operator:** Jet Propulsion Laboratory  
- **Part Of:** Ranger Program  
- **Classifications:** Space Probe, Artificial Satellite of the Sun  
- **Follows:** Ranger 2  
- **Succeeded By:** Ranger 4  

### Legacy
Although Ranger 3 did not return any scientific data about the Moon, its partial success in surviving launch and transmitting telemetry marked progress in deep-space communications and autonomous operations. These insights were instrumental in refining the design and execution of subsequent Ranger missions, culminating in the highly successful Ranger 7 through 9 missions that delivered detailed lunar imagery.

## Schema Markup
```json
{
  "@context": "https://schema.org",
  "@type": "Thing",
  "name": "Ranger 3",
  "description": "US spaceprobe to the Moon",
  "sameAs": [
    "https://www.wikidata.org/wiki/Q213410",
    "https://en.wikipedia.org/wiki/Ranger_3"
  ],
  "additionalType": "Space Probe"
}

## References

1. Jonathan's Space Report
2. Freebase Data Dumps. 2013