# Deep Impact

> NASA space probe launched in 2005 to study comet Tempel 1

**Wikidata**: [Q208231](https://www.wikidata.org/wiki/Q208231)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Deep_Impact_(spacecraft))  
**Source**: https://4ort.xyz/entity/deep-impact-q208231

## Summary
Deep Impact was a NASA space probe launched in 2005 to study comet Tempel 1. It was designed to impact the comet's surface and analyze its composition, representing a pioneering approach to comet exploration.

## Key Facts
- Deep Impact was launched on January 12, 2005, at 18:47:08 from Cape Canaveral Space Launch Complex 17B
- It had a launch mass of 601 kg (dry weight of 515 kg)
- The probe measured 3.3 meters long, 1.7 meters wide, and 2.3 meters high
- It was launched using a Delta II rocket (D311 configuration)
- The principal investigator was Michael A'Hearn
- The mission's capital cost was $267 million (launch vehicle cost, 2005)
- Deep Impact was manufactured by Ball Aerospace & Technologies
- The probe was powered by a spacecraft solar array and 16 nickel-hydrogen batteries
- The spacecraft operated until experiencing a loss of signal no earlier than August 8, 2013

## FAQs
### Q: What was the primary objective of the Deep Impact mission?
A: Deep Impact's primary objective was to study comet Tempel 1 by impacting its surface with a separate impactor spacecraft, allowing scientists to analyze the comet's composition and structure for the first time.

### Q: How much did the Deep Impact mission cost?
A: The Deep Impact mission had a capital cost of $267 million for the launch vehicle, with costs incurred in 2005. The total mission cost is not specified in the provided data.

### Q: What other comets did Deep Impact study after its primary mission?
A: After completing its primary mission to study Tempel 1, Deep Impact (under the extended EPOXI mission) performed multiple Earth gravity assists and studied comet 103P/Hartley in 2010.

## Why It Matters
Deep Impact was a pioneering mission that provided the first-ever direct look into the interior of a comet. By impacting Tempel 1's surface, the mission delivered crucial scientific data about comet composition, challenging previous theories about their formation and structure. The mission extended beyond its original objectives, repurposing the spacecraft for additional comet studies and Earth observations. Its success demonstrated innovative approaches to space exploration and provided valuable data that has helped scientists understand the composition of comets, which are considered time capsules from the early solar system.

## Notable For
- Being the first spacecraft to deliberately impact a comet's surface
- Performing an extended mission (EPOXI) that included studying comet 103P/Hartley
- Making multiple Earth gravity assists to reach additional comet targets
- Having a significant mass dedicated to scientific instrumentation (601 kg at launch)
- Operating successfully for over 8 years despite its complex mission profile

## Body

### Mission Overview
Deep Impact was a NASA space probe launched in 2005 as part of the Discovery Program. Its primary mission was to study comet Tempel 1 by impacting its surface with a separate impactor spacecraft. The mission was designed to provide data on the composition and structure of the comet, which scientists believed might contain pristine material from the early solar system.

### Technical Specifications
- Dimensions: 3.3 meters (length) × 1.7 meters (width) × 2.3 meters (height)
- Mass: 601 kg at launch (dry weight of 515 kg)
- Manufacturer: Ball Aerospace & Technologies
- Operator: Jet Propulsion Laboratory
- Power systems: Spacecraft solar array and nickel-hydrogen batteries (16 batteries)
- Space tug: Star 48
- Principal Investigator: Michael A'Hearn

### Launch and Early Mission
The Deep Impact spacecraft was launched on January 12, 2005, at 18:47:08 from Cape Canaveral Space Launch Complex 17B using a Delta II rocket (D311 configuration). The mission's capital cost for the launch vehicle was $267 million in 2005.

### Primary Mission: Comet Tempel 1 Impact
On July 4, 2005, the spacecraft performed a historic flyby of comet Tempel 1 at a distance of 500 kilometers. During this encounter, a separate impactor spacecraft collided with the comet's surface, creating a crater and ejecting material that was analyzed by the spacecraft's instruments.

### Extended Mission: EPOXI
After completing its primary mission, the spacecraft was repurposed for the EPOXI mission, which included:
- Earth gravity assist on December 31, 2007 (distance: 15,567.63 km)
- Earth gravity assist on December 29, 2008 (distance: 43,450 km)
- Earth gravity assist on June 27, 2010 (distance: 30,426 km)
- Flyby of comet 103P/Hartley on November 4, 2010 (distance: 694 km)

### Mission End
The Deep Impact spacecraft experienced a loss of signal no earlier than August 8, 2013, marking the end of its active mission after successfully operating for over 8 years.

### Scientific Achievements
- First direct sampling of a comet's interior material
- Detailed analysis of a comet's composition and structure
- Observation of comet activity and outgassing
- Data contributing to our understanding of solar system formation
- Successful demonstration of planetary defense techniques through impact cratering studies

## References

1. [Source](https://www.nasa.gov/pdf/101992main_factsheet-color-11-19-04.pdf)
2. [Source](https://www.nasa.gov/pdf/103744main_presskit_121404.pdf)
3. Jonathan's Space Report
4. [Source](https://space.skyrocket.de/doc_sdat/deep_impact.htm)
5. Freebase Data Dumps. 2013
6. [Source](https://pds.nasa.gov/ds-view/pds/viewContext.jsp?identifier=urn%3Anasa%3Apds%3Acontext%3Ainstrument_host%3Aspacecraft.dif&version=1.2)
7. [Source](https://pds.nasa.gov/ds-view/pds/viewContext.jsp?identifier=urn%3Anasa%3Apds%3Acontext%3Ainvestigation%3Amission.epoxi&version=1.1)
8. [Source](http://epoxi.umd.edu:80/1mission/status.shtml)
9. [Source](https://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/req/naif_ids.html)
10. [Source](https://www.nasa.gov/mission_pages/deepimpact/team/index.html)