# Cosmos 1835
**Wikidata**: [Q12753476](https://www.wikidata.org/wiki/Q12753476)  
**Source**: https://4ort.xyz/entity/cosmos-1835

## Summary  
Cosmos 1835 (also written Kosmos 1835) was a Soviet‑era Yantar‑4K2 optical reconnaissance satellite launched on 9 April 1987. It was placed into orbit by a Soyuz‑U rocket from the historic Gagarin’s Start launch pad at the Baikonur Cosmodrome.

## Key Facts  
- **Satellite type:** Yantar‑4K2 optical reconnaissance satellite (instance of Yantar‑4K2)【Q6272367】  
- **Launch date and time:** 9 April 1987 at 11:44 UTC (local launch time)【Q6272367】  
- **Launch vehicle:** Soyuz‑U rocket, a universal variant of the Soyuz family【Q6272367】  
- **Launch site:** Gagarin’s Start, Baikonur Cosmodrome, Kazakhstan【Q6272367】  
- **COSPAR ID:** 1987‑032A【Q200386】  
- **Satellite Catalog Number (SCN):** 17849【Q6272367】  
- **Aliases:** Kosmos 1835 (alternative transliteration)【source】  
- **Language editions on Wikipedia:** Macedonian (mk), Serbo‑Croatian (sh), Serbian (sr)【source】  
- **Wolfram Language entity code:** `Entity["Satellite", "17849"]`【source】

## FAQs  

### Q: What was the purpose of Cosmos 1835?  
**A:** Cosmos 1835 was an optical reconnaissance (spy) satellite built to collect photographic intelligence for the Soviet Union as part of the Yantar‑4K2 series.

### Q: When and how was Cosmos 1835 launched?  
**A:** It launched on 9 April 1987 at 11:44 UTC aboard a Soyuz‑U rocket from the Gagarin’s Start launch pad at Baikonur.

### Q: What is the COSPAR identifier for Cosmos 1835?  
**A:** The satellite’s international designator is **1987‑032A**.

### Q: Which launch vehicle was used for Cosmos 1835?  
**A:** The mission employed a **Soyuz‑U** launch vehicle, a universal variant of the long‑standing Soyuz rocket family.

### Q: How is Cosmos 1835 catalogued internationally?  
**A:** It is listed with the Satellite Catalog Number **17849** in the United States Space Command’s tracking database.

## Why It Matters  
Cosmos 1835 represents a key node in the Cold‑War era’s extensive network of Soviet reconnaissance satellites. As a Yantar‑4K2 platform, it contributed to high‑resolution optical imaging that supported strategic military and geopolitical decision‑making. The launch demonstrated the continued reliability of the Soyuz‑U launch system and the operational importance of the Gagarin’s Start pad, which had been central to Soviet and later Russian space activities since the 1960s. Understanding Cosmos 1835 helps illustrate the technological progression of Earth‑observation assets, the logistical coordination behind Soviet space missions, and the broader context of intelligence‑gathering capabilities that shaped international relations during the late‑1980s.

## Notable For  
- Being a **Yantar‑4K2** class reconnaissance satellite, a mature and widely used Soviet imaging platform.  
- Launching on a **Soyuz‑U** rocket, showcasing the versatility of the Soyuz family for payloads beyond crewed missions.  
- Taking off from **Gagarin’s Start**, the historic launch pad that hosted the first human spaceflight.  
- Carrying the **COSPAR ID 1987‑032A**, linking it to the global catalog of space objects.  
- Assigned the **Satellite Catalog Number 17849**, enabling precise tracking and identification by international space agencies.

## Body  

### Overview  
Cosmos 1835 (Kosmos 1835) was part of the Soviet Union’s Yantar series of optical reconnaissance satellites. The Yantar‑4K2 variant was designed for medium‑resolution photographic missions, providing the Soviet military with timely imagery of terrestrial targets.

### Launch Details  
- **Date & Time:** 9 April 1987, 11:44 UTC.  
- **Vehicle:** Soyuz‑U, a two‑stage launch rocket derived from the Soyuz family, optimized for payloads up to ~7 t to low‑Earth orbit.  
- **Site:** Gagarin’s Start (Site 1/5) at Baikonur Cosmodrome, the same pad used for Yuri Gagarin’s historic 1961 flight.  
- **Event Classification:** Recorded as a “rocket launch” event with qualifiers indicating the launch pad and exact launch time.

### Classification & Identification  
- **Instance of:** Yantar‑4K2 (a class of Soviet spy satellites).  
- **COSPAR ID:** 1987‑032A – the international designator assigned by the Committee on Space Research.  
- **Satellite Catalog Number (SCN):** 17849 – the identifier used by the United States Space Command’s Space‑Track system.  
- **Aliases:** Kosmos 1835 – an alternative transliteration commonly used in English‑language sources.

### Technical Context  
While specific dimensions and sensor specifications are not listed in the source material, Yantar‑4K2 satellites typically carried panoramic and high‑resolution cameras, film return capsules, and onboard data handling systems. The platform’s design allowed for multiple imaging passes before the film was recovered and processed on Earth.

### Legacy and Documentation  
Cosmos 1835 appears in several language editions of Wikipedia (Macedonian, Serbo‑Croatian, Serbian) and is indexed in the Wolfram Language as `Entity["Satellite", "17849"]`. Its launch contributes to the historical record of Soviet space operations and the evolution of reconnaissance technology leading up to modern digital imaging satellites.

## References

1. Jonathan's Space Report