# Casc Long March 4b
*launch services*

## Specifications
- **merge suggestions**: [{"slug":"casc-long-march-4c","name":"Casc Long March 4c","score":0.9444444444444444,"matchedOn":"slug","matchedValue":"casc-long-march-4c"},{"slug":"casc-long-march-3b","name":"Casc Long March 3b","score":0.9444444444444444,"matchedOn":"slug","matchedValue":"casc-long-march-3b"},{"slug":"casc-long-march-2d","name":"Casc Long March 2d","score":0.8888888888888888,"matchedOn":"slug","matchedValue":"casc-long-march-2d"},{"slug":"casc-long-march-3a","name":"Casc Long March 3a","score":0.8888888888888888,"matchedOn":"slug","matchedValue":"casc-long-march-3a"},{"slug":"casc-long-march-2c","name":"Casc Long March 2c","score":0.8888888888888888,"matchedOn":"slug","matchedValue":"casc-long-march-2c"}]
- **entity type**: launch_service
- **last verified date**: 2026-06-16
- **verified by**: agency-doc
- **claim status**: agency-sourced
- **attributes**: {"merge_suggestions":"[{\"slug\":\"casc-long-march-4c\",\"name\":\"Casc Long March 4c\",\"score\":0.9444444444444444,\"matchedOn\":\"slug\",\"matchedValue\":\"casc-long-march-4c\"},{\"slug\":\"casc-long-march-3b\",\"name\":\"Casc Long March 3b\",\"score\":0.9444444444444444,\"matchedOn\":\"slug\",\"matchedValue\":\"casc-long-march-3b\"},{\"slug\":\"casc-long-march-2d\",\"name\":\"Casc Long March 2d\",\"score\":0.8888888888888888,\"matchedOn\":\"slug\",\"matchedValue\":\"casc-long-march-2d\"},{\"slug\":\"casc-long-march-3a\",\"name\":\"Casc Long March 3a\",\"score\":0.8888888888888888,\"matchedOn\":\"slug\",\"matchedValue\":\"casc-long-march-3a\"},{\"slug\":\"casc-long-march-2c\",\"name\":\"Casc Long March 2c\",\"score\":0.8888888888888888,\"matchedOn\":\"slug\",\"matchedValue\":\"casc-long-march-2c\"}]"}

## Editorial
Long March 4B is a three-stage storable-liquid Long March launch vehicle used mainly for SSO and LEO missions.[^sast-lm4b4c][^cnsa-lm4b] The Long March 4B/4C family is described as a 47 m class, 3.35 m diameter vehicle family, and Long March 4B first flew on 1999-05-10.[^sast-lm4b4c] Payload figures vary by reference orbit: 2,910 kg to 600 km SSO, 2.65 tonnes to 600 km polar orbit, and 2,200 kg to 700 km SSO.[^sast-lm4b4c][^cnsa-lm4b] The vehicle remained active as of 2026-06-16; Long March-4B launches occurred in December 2025.[^xinhua-lm4b-2025]

## Sources
- [cgwic-lm4] | LM-4, CGWIC | https://www.cgwic.com/Launchservice/LM4.html | tier=operator-datasheet | accessed=2026-06-16
- [sast-lm4b4c] | LM-4B/4C, Shanghai Academy of Spaceflight Technology | https://www.sast.net/product/12.html | tier=operator-datasheet | accessed=2026-06-16
- [cnsa-lm4b] | Long March-4B, CNSA | https://www.cnsa.gov.cn/english/n6465715/n6465718/c6476916/content.html | tier=agency-doc | accessed=2026-06-16
- [xinhua-lm4b-2025] | China launches new satellite, Xinhua | https://english.news.cn/20251230/98c31942c3a94643a9af6d2be6cd894f/c.html | tier=third-party | accessed=2026-06-16 | published=2025-12-30
- [cgwic-launch-record] | Launch Record, CGWIC | https://www.cgwic.com/Launchservice/LaunchRecord.html | tier=operator-datasheet | accessed=2026-06-16

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Source: https://eo-atlas.org/launch_services/casc-long-march-4b
Maintainer: SpectraWorks B.V. (CC-BY 4.0)