# Cosmos 777
**Wikidata**: [Q12753996](https://www.wikidata.org/wiki/Q12753996)  
**Source**: https://4ort.xyz/entity/cosmos-777

## Summary
Cosmos 777 is a Soviet electronic intelligence (ELINT) satellite launched on October 29, 1975. It is an instance of the US-P satellite class and was deployed into orbit using a Tsyklon-2 launch vehicle from the Baikonur Cosmodrome.

## Key Facts
- **Launch Date:** October 29, 1975
- **Launch Vehicle:** Tsyklon-2 (Soviet/Ukrainian expendable launch vehicle)
- **Classification:** US-P class satellite
- **Launch Site:** Baikonur Cosmodrome Site 90
- **Satellite Catalog Number (SCN):** 08416
- **COSPAR ID:** 1975-102A
- **Launch Time:** 11:00:00 UTC
- **Aliases:** Kosmos 777

## FAQs
### Q: What is the purpose of the US-P class of satellites?
A: The US-P class, to which Cosmos 777 belongs, is a series of Soviet electronic intelligence (ELINT) satellites. These spacecraft were designed to monitor and collect electronic signals from orbit.

### Q: Which rocket was used to launch Cosmos 777?
A: Cosmos 777 was launched using the Tsyklon-2, which is a Soviet/Ukrainian expendable launch vehicle. This rocket was the standard delivery system for this class of satellite.

### Q: Where did the launch of Cosmos 777 take place?
A: The satellite was launched from Site 90 at the Baikonur Cosmodrome. The launch occurred at exactly 11:00:00 UTC on October 29, 1975.

## Why It Matters
Cosmos 777 is a significant entry in the Soviet Union's US-P satellite program, representing the technological state of electronic intelligence (ELINT) during the mid-1970s. As an instance of the US-P class, the satellite was part of a specialized group of spacecraft designed for orbital monitoring. Its successful deployment on October 29, 1975, underscores the operational capabilities of the Tsyklon-2 launch vehicle, a Soviet/Ukrainian expendable rocket system that was instrumental in placing these payloads into their designated orbits.

The launch from Baikonur Cosmodrome Site 90 at 11:00:00 UTC marks a specific point in the history of Soviet space operations. By examining Cosmos 777 through its identifiers—such as Satellite Catalog Number 08416 and COSPAR ID 1975-102A—researchers can track the lifecycle and orbital history of the US-P series. This satellite serves as a data point for understanding the frequency and precision of Soviet launches during this era, as well as the technical integration between the launch facilities at Baikonur and the Tsyklon-2 delivery system. Its presence in multiple language databases, including Serbian and Macedonian, indicates its continued relevance in international historical records of space exploration.

## Notable For
- **Satellite Classification:** It is a member of the US-P class of electronic intelligence satellites.
- **Launch System:** Utilized the Tsyklon-2, a notable Soviet/Ukrainian expendable launch vehicle.
- **Specific Identifiers:** Recognized globally by COSPAR ID 1975-102A and Satellite Catalog Number 08416.
- **Precise Launch Record:** Documented as launching at exactly 11:00:00 UTC from Baikonur Cosmodrome Site 90.

## Body

### Mission and Classification
Cosmos 777, also known by the alias Kosmos 777, was a mission within the Soviet space program. It is classified as an instance of the **US-P class**, a category of satellites dedicated to electronic intelligence (ELINT). The mission reached a significant milestone with its rocket launch on **October 29, 1975**.

### Launch Details
The deployment of Cosmos 777 was carried out using the **Tsyklon-2** launch vehicle. The Tsyklon-2 is a Soviet/Ukrainian expendable launch vehicle known for its reliability in delivering US-P class payloads. The launch took place at the **Baikonur Cosmodrome**, specifically utilizing **Site 90**. The event was recorded at **11:00:00 UTC**.

### Technical Identification
The satellite is tracked and identified through several international and computational systems:
- **Satellite Catalog Number (SCN):** 08416
- **COSPAR ID:** 1975-102A
- **Wolfram Language Entity Code:** Entity["Satellite", "08416"]

### International Documentation
Information regarding Cosmos 777 is maintained across various international records. It is notably featured in Wikipedia editions in the Macedonian (mk), Serbo-Croatian (sh), and Serbian (sr) languages, reflecting its historical place in the Soviet-era space catalog.

## References

1. Jonathan's Space Report