# DOS-2

> Soviet Salyut space station that suffered a launch failure

**Wikidata**: [Q518745](https://www.wikidata.org/wiki/Q518745)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/DOS-2)  
**Source**: https://4ort.xyz/entity/dos-2

## Summary
DOS-2 was a Soviet Salyut space station that failed during launch on July 29, 1972. It was part of the Salyut programme and intended to follow Salyut 1 as the second space station in the series.

## Key Facts
- **Launch Date**: July 29, 1972, at 03:20:57 UTC from Baikonur Cosmodrome Site 81/23.
- **Launch Vehicle**: Proton-K rocket (serial number 260-01).
- **Mass**: 18,210 kg.
- **Dimensions**: Length 15.8 m, diameter 4.15 m, width 10 m.
- **Volume**: 90 cubic meters.
- **Maximum Capacity**: 2 passengers.
- **Orbital Inclination**: 51.6 degrees.
- **Followed By**: Salyut 2, launched in 1973.
- **Part Of**: Salyut programme, a series of Soviet space stations.
- **Significant Event**: Atmospheric entry on the same day as launch due to failure.

## FAQs
### Q: What was DOS-2?
A: DOS-2 was a Soviet space station intended to be the second in the Salyut programme, but it failed during launch on July 29, 1972.

### Q: What caused the failure of DOS-2?
A: The launch failure occurred during the ascent phase, leading to the space station re-entering the atmosphere on the same day.

### Q: What were the dimensions of DOS-2?
A: DOS-2 had a length of 15.8 meters, a diameter of 4.15 meters, and a width of 10 meters.

### Q: What was the purpose of DOS-2?
A: DOS-2 was designed to remain in space for an extended period with a crew, serving as a space station for scientific and operational purposes.

### Q: What followed DOS-2 in the Salyut programme?
A: Salyut 2 was launched in 1973 as the next space station in the Salyut programme.

## Why It Matters
DOS-2 represents an important milestone in the history of space exploration, particularly in the development of space stations. Although it failed during launch, its design and intended purpose contributed to the evolution of the Salyut programme and subsequent space station technologies. The failure of DOS-2 highlighted the challenges and risks associated with space launches, leading to improvements in rocket technology and launch procedures. Understanding the history of DOS-2 provides insight into the early days of space station development and the perseverance required to achieve success in space exploration.

## Notable For
- **First Attempt**: DOS-2 was the second attempt by the Soviet Union to launch a space station, following Salyut 1.
- **Launch Failure**: It is notable for its launch failure, which occurred on July 29, 1972.
- **Design**: DOS-2 was identical in design to Salyut 1, with a length of 15.8 meters and a diameter of 4.15 meters.
- **Part of Salyut Programme**: It was part of the Salyut programme, a series of space stations launched by the Soviet Union.
- **Contribution to Space Exploration**: Despite its failure, DOS-2 contributed to the development of space station technology and the understanding of launch procedures.

## Body
### Overview
DOS-2 was a Soviet space station intended to be the second in the Salyut programme. It was designed to remain in space for an extended period with a crew, serving as a platform for scientific and operational purposes.

### Launch and Failure
- **Launch Date**: July 29, 1972, at 03:20:57 UTC.
- **Launch Vehicle**: Proton-K rocket (serial number 260-01).
- **Launch Site**: Baikonur Cosmodrome Site 81/23.
- **Failure**: The launch failed during the ascent phase, leading to the space station re-entering the atmosphere on the same day.

### Specifications
- **Mass**: 18,210 kg.
- **Dimensions**: Length 15.8 m, diameter 4.15 m, width 10 m.
- **Volume**: 90 cubic meters.
- **Maximum Capacity**: 2 passengers.
- **Orbital Inclination**: 51.6 degrees.

### Context within the Salyut Programme
- **Preceded By**: Salyut 1, the first space station launched by the Soviet Union.
- **Followed By**: Salyut 2, launched in 1973.
- **Part Of**: Salyut programme, a series of space stations launched by the Soviet Union.

### Significance
Despite its failure, DOS-2 contributed to the development of space station technology and the understanding of launch procedures. It highlighted the challenges and risks associated with space launches, leading to improvements in rocket technology and launch procedures.

## Schema Markup
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  "@type": "Thing",
  "name": "DOS-2",
  "description": "Soviet Salyut space station that suffered a launch failure",
  "sameAs": ["https://www.wikidata.org/wiki/Q10000", "https://en.wikipedia.org/wiki/DOS-2"],
  "additionalType": "SpaceStation"
}

## References

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