# Tyazhely Sputnik

> Soviet unmanned spacecraft launched in 1961 towards Venus, lost in a launch vehicle failure

**Wikidata**: [Q40610](https://www.wikidata.org/wiki/Q40610)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Tyazhely_Sputnik)  
**Source**: https://4ort.xyz/entity/tyazhely-sputnik

## Summary
Tyazhely Sputnik was a Soviet spacecraft launched in 1961 as part of the Venera program, intended as a planetary probe to investigate Venus. The mission failed due to a launch vehicle malfunction, causing the spacecraft to remain in Earth orbit before re-entering the atmosphere.

## Key Facts
- Launched on **February 4, 1961**, from **Gagarin's Start** using a **Molniya rocket**.
- Also known as **Venera 1VA No.1**, **Sputnik 7**, or **Tyazheliy Sputnik 4**.
- **Mass**: 6,483 kg (launch weight), 644 kg (dry weight).
- **Orbital parameters**: Apoapsis of 296 km, periapsis of 179 km, inclination of 64.9°, orbital period of 89.25 minutes.
- **Decayed from orbit** on **February 26, 1961**, after failing to escape Earth's orbit.
- **Manufacturer**: S.P. Korolev Rocket and Space Corporation Energia.
- **Part of the Venera program**, a series of Soviet spacecraft designed for planetary exploration.

## FAQs
### Q: What was the purpose of Tyazhely Sputnik?
A: Tyazhely Sputnik was intended to be a planetary probe to study Venus as part of the Soviet Venera program. However, it failed to leave Earth orbit due to a launch vehicle malfunction.

### Q: Why did Tyazhely Sputnik fail?
A: The mission failed because the **Molniya rocket**'s upper stage malfunctioned, preventing the spacecraft from achieving the necessary velocity to escape Earth's orbit.

### Q: What happened to Tyazhely Sputnik after launch?
A: After the launch failure, the spacecraft remained in **low Earth orbit** and re-entered the atmosphere on **February 26, 1961**, burning up upon entry.

### Q: Is Tyazhely Sputnik the same as Sputnik 7?
A: No, Tyazhely Sputnik is **different from Sputnik 7**, despite sometimes being referred to by that name. It was part of the Venera program, whereas Sputnik 7 was a separate mission.

### Q: What was the significance of the Venera program?
A: The Venera program was the Soviet Union's series of spacecraft designed to explore Venus, marking some of the first attempts to study another planet directly.

## Why It Matters
Tyazhely Sputnik represents an early attempt in the **Space Race** to explore other planets, specifically Venus. Although the mission failed, it was part of the broader **Venera program**, which later achieved significant milestones, including the first successful planetary probe (Venera 1) and the first spacecraft to enter another planet's atmosphere. The failure of Tyazhely Sputnik highlights the challenges of early space exploration, particularly in rocket reliability and orbital mechanics. Its story underscores the iterative nature of space missions, where setbacks often precede breakthroughs.

## Notable For
- **First attempted Soviet Venus probe** under the Venera program.
- **One of the heaviest early spacecraft**, with a launch mass of 6,483 kg.
- **Failed due to a Molniya rocket malfunction**, a common issue in early Soviet space launches.
- **Remained in Earth orbit** before decaying, providing data on orbital dynamics.
- **Part of a series of ambitious Soviet planetary missions** that later achieved historic firsts.

## Body
### Mission Overview
Tyazhely Sputnik was launched on **February 4, 1961**, from **Gagarin's Start** (Baikonur Cosmodrome) using a **Molniya rocket**. The spacecraft was designed as a **planetary probe** to study Venus but failed to escape Earth's orbit due to a malfunction in the rocket's upper stage.

### Technical Specifications
- **Mass**:
  - Launch weight: **6,483 kg**
  - Dry weight: **644 kg**
- **Orbital Parameters**:
  - Apoapsis: **296 km**
  - Periapsis: **179 km**
  - Inclination: **64.9°**
  - Orbital period: **89.25 minutes**
- **Manufacturer**: **S.P. Korolev Rocket and Space Corporation Energia**

### Launch and Failure
The **Molniya rocket** failed during the upper stage burn, leaving Tyazhely Sputnik stranded in **low Earth orbit**. The spacecraft re-entered the atmosphere on **February 26, 1961**, marking the end of the mission.

### Relation to Other Missions
Tyazhely Sputnik was part of the **Venera program**, which included:
- **Venera 1**: The first successful Soviet Venus probe, launched shortly after Tyazhely Sputnik.
- **Korabl-Sputnik 3**: A precursor mission testing spacecraft systems.

### Legacy
Despite its failure, Tyazhely Sputnik contributed to the development of Soviet planetary exploration. The Venera program later achieved multiple historic firsts, including the first successful interplanetary probe (Venera 1) and the first spacecraft to land on another planet (Venera 7).

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## References

1. Jonathan's Space Report
2. Freebase Data Dumps. 2013
3. [Source](https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1961-002A)
4. Quora