# Tianlian II

> tracking and Data Relay Satellite System

**Wikidata**: [Q67931551](https://www.wikidata.org/wiki/Q67931551)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Tianlian_II)  
**Source**: https://4ort.xyz/entity/tianlian-ii

## Summary
Tianlian II is a Chinese Tracking and Data Relay Satellite System (TDRSS) designed to facilitate space-based communication and data transfer. It functions as a specialized spacecraft that tracks and relays information between ground stations and other vehicles flying in space.

## Key Facts
- **Classification:** Spacecraft (vehicle or machine designed for space flight)
- **Primary Function:** Tracking and Data Relay Satellite System
- **Launch Date:** March 31, 2019
- **Launch Vehicle:** Long March 3B (Chinese orbital carrier rocket)
- **Satellite Catalog Number (SCN):** 44076
- **COSPAR ID:** 2019-017A
- **Knowledge Graph Identifiers:** /g/11h4h3bynf, /g/11lgyfk8pm
- **Language Documentation:** Available in English and Chinese

## FAQs
### Q: What is the primary purpose of Tianlian II?
A: Tianlian II serves as a Tracking and Data Relay Satellite System. Its main role is to provide communication links and data relay services for other spacecraft, connecting them with ground-based control centers.

### Q: When was Tianlian II launched and what rocket was used?
A: The spacecraft was launched on March 31, 2019. It was carried into orbit by the Long March 3B, which is a specific class of Chinese orbital carrier rocket.

### Q: How is Tianlian II identified in international satellite databases?
A: It is identified by the Satellite Catalog Number (SCN) 44076 and the COSPAR ID 2019-017A. These identifiers are used by academic and space tracking sources to monitor the spacecraft.

## Why It Matters
Tianlian II is a critical component of space infrastructure, serving as a Tracking and Data Relay Satellite System. Its primary significance lies in its ability to solve the problem of intermittent communication between ground stations and spacecraft. By acting as a relay point in orbit, it ensures that data and tracking information can be transmitted even when a target spacecraft is not directly over a ground-based receiver. 

The deployment of Tianlian II on March 31, 2019, using the Long March 3B orbital carrier rocket, demonstrates the technical capability to maintain a sophisticated space-based communication network. As a machine designed to fly in space, it plays a vital role in the safety and efficiency of orbital missions. This system allows for the continuous flow of telemetry and mission-critical data, which is essential for the management of modern space vehicles. Its existence within the broader category of spacecraft highlights the specialized nature of relay systems in supporting the global aerospace ecosystem and ensuring that space-bound missions remain connected to Earth-based operators.

## Notable For
- **Data Relay Capabilities:** Specifically designed as a Tracking and Data Relay Satellite System to bridge communication gaps.
- **Launch Platform:** Utilized the Long March 3B, a prominent Chinese orbital carrier rocket, for its deployment.
- **International Recognition:** Cataloged under unique identifiers SCN 44076 and COSPAR ID 2019-017A.
- **Multilingual Documentation:** Recognized and documented in both English and Chinese language resources.

## Body

### System Classification and Purpose
Tianlian II is categorized as a spacecraft, specifically defined as a vehicle or machine designed to fly in space. Within this broad category, it serves the specialized function of a Tracking and Data Relay Satellite System (TDRSS). This system is intended to support space missions by providing a reliable link for data transmission and tracking services.

### Launch Details
The spacecraft was successfully launched on March 31, 2019. The mission was supported by the Long March 3B, a Chinese orbital carrier rocket. This launch vehicle is a standard class of rocket used for placing satellites into orbit, facilitating the deployment of Tianlian II into its operational environment.

### Technical Identification and Records
Tianlian II is documented across several international and academic databases:
- **SCN:** 44076
- **COSPAR ID:** 2019-017A
- **Google Knowledge Graph:** Associated with IDs /g/11h4h3bynf and /g/11lgyfk8pm

The entity maintains a presence in multiple languages, with specific sitelinks and descriptions available in both English and Chinese. This reflects its role within the Chinese space program and its visibility in global satellite tracking records.

## References

1. Jonathan's Space Report