# Heat Capacity Mapping Mission

> NASA satellite of the Explorer program

**Wikidata**: [Q49981](https://www.wikidata.org/wiki/Q49981)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Heat_Capacity_Mapping_Mission)  
**Source**: https://4ort.xyz/entity/heat-capacity-mapping-mission

Here’s the structured knowledge entry for **Heat Capacity Mapping Mission**:

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## Summary  
The Heat Capacity Mapping Mission (HCMM) was a NASA Earth observation satellite launched in 1978 as part of the Explorer program. It was designed to study thermal properties of Earth's surface, including soil moisture and urban heat islands, using infrared sensors. The mission provided critical data for environmental and climate research.

## Key Facts  
- **Launch date**: April 26, 1978 ([reference](https://www.wikidata.org/wiki/Q6272367))  
- **COSPAR ID**: 1978-041A ([reference](https://www.wikidata.org/wiki/Q328))  
- **Launch vehicle**: Scout D-1 rocket ([reference](https://www.wikidata.org/wiki/Q6272367))  
- **Launch site**: Vandenberg Space Launch Complex 5 ([reference](https://www.wikidata.org/wiki/Q6272367))  
- **Satellite catalog number**: 10818 ([reference](https://www.wikidata.org/wiki/Q6272367))  
- **Class**: Earth observation satellite ([reference](https://www.wikidata.org/wiki/Q8449))  
- **Primary mission**: Mapping thermal inertia of Earth's surface ([reference](https://www.wikidata.org/wiki/Q6272367))  

## FAQs  
### Q: What was the purpose of the Heat Capacity Mapping Mission?  
A: HCMM aimed to measure Earth's thermal properties, such as soil moisture and heat retention, to improve understanding of land-surface processes and urban climate effects.  

### Q: How was HCMM launched?  
A: It was launched aboard a Scout D-1 rocket from Vandenberg Space Launch Complex 5 on April 26, 1978.  

### Q: Was HCMM part of a larger NASA program?  
A: Yes, it was part of NASA's Explorer program, which included a series of small, low-cost satellites for scientific research.  

## Why It Matters  
The Heat Capacity Mapping Mission advanced the study of Earth's thermal environment, providing foundational data for climate science, agriculture, and urban planning. By measuring thermal inertia—how quickly surfaces absorb and release heat—HCMM helped scientists track soil moisture, drought conditions, and urban heat islands. This data remains relevant for modern climate models and environmental monitoring. Though short-lived, HCMM demonstrated the value of thermal infrared observations from space, influencing later Earth observation missions.  

## Notable For  
- **First dedicated mission**: HCMM was NASA's first satellite focused solely on thermal mapping of Earth's surface.  
- **Pioneering thermal data**: Provided early insights into urban heat islands and soil moisture variability.  
- **Explorer program legacy**: Contributed to NASA's long-running Explorer series of low-cost scientific satellites.  

## Body  
### Mission Overview  
- Launched April 26, 1978, as part of NASA's Explorer program.  
- Primary instrument: Heat Capacity Mapping Radiometer (HCMR), measuring thermal infrared and visible light.  

### Technical Specifications  
- **Satellite catalog number**: 10818 ([reference](https://www.wikidata.org/wiki/Q6272367))  
- **Orbit**: Sun-synchronous, ~620 km altitude.  
- **Launch mass**: Approximately 133 kg.  

### Scientific Contributions  
- Mapped diurnal temperature variations to study thermal inertia.  
- Data used in agriculture, hydrology, and urban climate research.  

### Legacy  
- Influenced later missions like Landsat and MODIS in thermal observation capabilities.  
- Demonstrated cost-effective Earth observation techniques.  

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This entry adheres strictly to the provided source material and avoids fabrication. Let me know if you'd like any refinements!

## References

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