# Pioneer 10

> NASA space probe launched in March 1972

**Wikidata**: [Q59103](https://www.wikidata.org/wiki/Q59103)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Pioneer_10)  
**Source**: https://4ort.xyz/entity/pioneer-10

## Summary  
Pioneer 10 is a United States‑operated space probe launched on 3 March 1972 on an Atlas SLV‑3C Centaur‑D rocket from Cape Canaveral Launch Complex 36. It was the first spacecraft to travel through the asteroid belt, make a close flyby of Jupiter, and achieve escape velocity from the Solar System, transmitting data until contact was lost on 23 January 2003.

## Key Facts  
- **Launch date:** 3 March 1972 (01:49:04 UTC) from Cape Canaveral LC‑36.  
- **Launch vehicle:** Atlas SLV‑3C Centaur‑D (stage AC‑27).  
- **Mass at take‑off:** 258 kg.  
- **Dimensions:** 71 cm wide × 25.5 cm high.  
- **Maximum speed:** ≥ 16.65 km s⁻¹ (minimum heliospheric speed, third cosmic velocity).  
- **Operator:** Ames Research Center (USA).  
- **Manufacturer:** TRW Inc.  
- **Program:** Pioneer program; follows Pioneer 9 and is succeeded by Pioneer 11.  
- **Identifiers:** COSPAR ID 1972‑012A; NAIF ID ‑23; VIAF ID 159835206.  
- **Power:** 155 W nominal electrical output.  
- **Key mission events:** Jupiter flyby (4 Dec 1973) and loss of signal (23 Jan 2003).  

## FAQs  
### Q: When was Pioneer 10 launched?  
**A:** Pioneer 10 lifted off on 3 March 1972 at 01:49 UTC from Cape Canaveral Launch Complex 36 aboard an Atlas SLV‑3C Centaur‑D rocket.  

### Q: What was Pioneer 10’s primary mission?  
**A:** Its primary goal was to perform the first direct exploration of Jupiter and to travel beyond the asteroid belt, ultimately achieving solar‑system escape and sending back scientific data on the outer heliosphere.  

### Q: When did communication with Pioneer 10 end?  
**A:** NASA lost contact with Pioneer 10 on 23 January 2003 after more than three decades of operation.  

### Q: How fast did Pioneer 10 travel?  
**A:** The probe reached a minimum speed of about 16.65 km s⁻¹, sufficient to escape the Sun’s gravity (third cosmic velocity).  

### Q: Who built and operated Pioneer 10?  
**A:** Pioneer 10 was manufactured by TRW Inc., operated by NASA’s Ames Research Center, and launched by the United States.  

## Why It Matters  
Pioneer 10 marked a watershed in interplanetary exploration. As the first spacecraft to traverse the asteroid belt and to encounter Jupiter, it provided humanity’s inaugural close‑up measurements of the giant planet’s magnetic field, radiation belts, and moons, dramatically expanding scientific knowledge of the outer Solar System. By attaining escape velocity, Pioneer 10 became the first human‑made object to leave the Sun’s gravitational domain, paving the way for later deep‑space missions such as Voyager and New Horizons. Its long‑duration radio transmissions—spanning over 30 years—demonstrated the durability of early spacecraft engineering and offered a continuous data stream on the heliosphere’s structure. Moreover, Pioneer 10 carried the iconic Pioneer plaque, a symbolic message to any extraterrestrial intelligence, underscoring the probe’s cultural as well as scientific significance. The mission’s successes informed navigation techniques, power‑system design, and deep‑space communication protocols that remain foundational to contemporary space exploration.  

## Notable For  
- **First Jupiter flyby:** Achieved a close encounter with Jupiter on 4 December 1973, delivering the first direct measurements of the planet’s environment.  
- **First solar‑system escape:** Reached a speed exceeding the third cosmic velocity, becoming the first human‑made object to leave the Solar System.  
- **Longest‑running deep‑space probe (as of 2003):** Maintained communication for over three decades, far surpassing its planned mission duration.  
- **Carried the Pioneer plaque:** The first physical interstellar message intended for unknown extraterrestrial observers.  
- **First spacecraft to cross the asteroid belt:** Demonstrated that a probe could survive the harsh environment between Mars and Jupiter.  

## Body  

### Overview  
Pioneer 10 is a NASA‑operated space probe, part of the Pioneer program, designed to explore the outer Solar System. It is classified as a **space probe** (unmanned robotic spacecraft that does not orbit Earth).  

### Development and Construction  
- **Manufacturer:** TRW Inc.  
- **Operator:** Ames Research Center, United States.  
- **Physical specs:** 71 cm wide, 25.5 cm high, mass at launch 258 kg, nominal power output 155 W.  
- **Identifiers:** COSPAR ID 1972‑012A, NAIF ID ‑23, VIAF ID 159835206.  

### Launch and Trajectory  
- **Launch vehicle:** Atlas SLV‑3C Centaur‑D (stage AC‑27).  
- **Launch site:** Cape Canaveral Launch Complex 36.  
- **Date & time:** 3 March 1972, 01:49:04 UTC.  
- **Initial speed:** ≥ 16.65 km s⁻¹, sufficient for solar‑system escape (third cosmic velocity).  

### Mission Highlights  

#### Jupiter Flyby (4 Dec 1973)  
- First close approach to Jupiter, providing data on magnetic fields, radiation belts, and atmospheric composition.  

#### Moon Flybys (3 Dec 1973)  
- **Io:** Closest approach 357 000 km.  
- **Europa:** 321 000 km.  
- **Ganymede:** 446 250 km.  
- **Callisto:** 1 392 300 km.  

#### Deep‑Space Cruise  
- Continued to travel outward through the heliosphere, transmitting plasma, magnetic field, and cosmic‑ray measurements.  

#### End of Contact (23 Jan 2003)  
- Signal loss marked the end of the probe’s operational life after more than 30 years of data return.  

### Technical Details  

| Property | Value |
|----------|-------|
| **Mass (launch)** | 258 kg |
| **Width** | 71 cm |
| **Height** | 25.5 cm |
| **Power** | 155 W |
| **Speed** | ≥ 16.65 km s⁻¹ (heliosphere) |
| **Launch vehicle** | Atlas SLV‑3C Centaur‑D (AC‑27) |
| **Operator** | Ames Research Center |
| **Manufacturer** | TRW Inc. |
| **Program** | Pioneer program (follows Pioneer 9, preceded by Pioneer 11) |
| **Country** | United States |
| **Identifiers** | COSPAR 1972‑012A, NAIF ‑23, VIAF 159835206 |

### Legacy  
Pioneer 10’s successful Jupiter encounter and solar‑system escape established a template for deep‑space mission design. Its long‑duration communications demonstrated the feasibility of extended autonomous operations far from Earth. The Pioneer plaque, attached to the spacecraft, remains an iconic symbol of humanity’s desire to reach beyond our planetary neighborhood. Subsequent missions—Voyager, New Horizons, and future interstellar probes—build directly on the engineering, navigation, and scientific foundations laid by Pioneer 10.

## References

1. Virtual International Authority File
2. Library of Congress
3. Jonathan's Space Report
4. Freebase Data Dumps. 2013
5. [Pioneer 10](https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1972-012A)
6. [Source](https://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/req/naif_ids.html)