# LightSail-1

> former solar sail spacecraft demonstrator

**Wikidata**: [Q20804089](https://www.wikidata.org/wiki/Q20804089)  
**Source**: https://4ort.xyz/entity/lightsail-1

## Summary
LightSail-1 was a solar sail spacecraft demonstrator developed by The Planetary Society to test experimental propulsion technology. Launched in 2015, it was a CubeSat designed to deploy a solar sail, though its mission was cut short by atmospheric reentry after 25 days.

## Key Facts
- **Type**: Technology demonstration spacecraft and CubeSat (10 cm × 10 cm × 30 cm).
- **Mass**: 5 kg.
- **Launch Date**: May 20, 2015, at 15:05 UTC from Cape Canaveral Space Launch Complex 41.
- **Operator/Manufacturer**: The Planetary Society.
- **Launch Vehicle**: Atlas V 501 (AV-054) by United Launch Alliance.
- **Mission Duration**: 25 days (atmospheric reentry on June 14, 2015, at 17:24 UTC).
- **Power Source**: Solar sail propulsion.
- **Followed By**: LightSail-2, a successor solar sail demonstrator.
- **COMPAR/NSSDCA ID**: 2015-025L.

## FAQs
### Q: What was the purpose of LightSail-1?
A: LightSail-1 was a technology demonstrator designed to test the deployment and functionality of a solar sail, a propulsion method that uses sunlight pressure for movement in space.

### Q: How long was LightSail-1 in orbit?
A: LightSail-1 operated for 25 days before reentering Earth's atmosphere on June 14, 2015.

### Q: Who built and operated LightSail-1?
A: The spacecraft was developed and operated by The Planetary Society, a non-profit space advocacy organization.

### Q: What happened after LightSail-1?
A: It was succeeded by LightSail-2, which successfully demonstrated controlled solar sailing in Earth orbit.

### Q: What were the dimensions of LightSail-1?
A: The spacecraft measured 10 cm × 10 cm × 30 cm, conforming to the CubeSat standard.

## Why It Matters
LightSail-1 represented a critical step in validating solar sail technology, which could revolutionize space propulsion by eliminating the need for traditional fuel. Solar sails harness the momentum of photons from sunlight, offering a sustainable and long-duration propulsion method for future deep-space missions. Though its mission was brief, LightSail-1 provided valuable data on sail deployment and spacecraft operations, paving the way for its successor, LightSail-2, which achieved controlled solar sailing. This technology could enable low-cost, long-term missions to study asteroids, comets, or even interstellar space, reducing reliance on chemical propulsion systems.

## Notable For
- **First Solar Sail Demonstrator by The Planetary Society**: LightSail-1 was the organization’s inaugural attempt to test solar sail technology in space.
- **CubeSat Form Factor**: One of the earliest CubeSats designed to deploy a solar sail, showcasing miniaturized satellite capabilities.
- **Short but Impactful Mission**: Despite its brief 25-day operation, it provided critical insights for the development of LightSail-2.
- **Publicly Funded Space Technology**: Funded by private donations, demonstrating the role of non-governmental organizations in advancing space exploration.
- **Precursor to Successful Solar Sailing**: Directly led to LightSail-2, which became the first spacecraft to raise its orbit using sunlight alone.

## Body
### Overview
LightSail-1 was a technology demonstration spacecraft and CubeSat developed by The Planetary Society to test solar sail propulsion. It was part of the LightSail program, which aimed to prove the feasibility of using sunlight for spacecraft propulsion.

### Launch and Mission
- **Launch**: May 20, 2015, aboard an Atlas V 501 rocket (mission AV-054) from Cape Canaveral Space Launch Complex 41.
- **Orbit**: Low Earth orbit (LEO), though specific altitude details are not provided in the source material.
- **Deployment**: The spacecraft successfully deployed its solar sail, though the mission was cut short due to atmospheric drag.

### Technical Specifications
- **Dimensions**: 10 cm (width) × 10 cm (length) × 30 cm (height).
- **Mass**: 5 kg.
- **Propulsion**: Solar sail, which uses the pressure of sunlight for thrust.
- **Designation**: Also known as LightSail-A.

### Mission Timeline
- **Launch**: May 20, 2015, at 15:05 UTC.
- **Atmospheric Reentry**: June 14, 2015, at 17:24 UTC, marking the end of the mission.

### Legacy
LightSail-1’s brief mission provided essential data for the development of LightSail-2, which launched in 2019 and successfully demonstrated controlled solar sailing in Earth orbit. The project highlighted the potential of solar sails for future space exploration, particularly for missions requiring long-duration, fuel-free propulsion.

## Schema Markup
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  "dateCreated": "2015-05-20",
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## References

1. [Source](https://space.skyrocket.de/doc_sdat/lightsail-1.htm)
2. Jonathan's Space Report
3. [Source](http://www.satobs.org/LightSail-A.html)