Space Brief 11 Dec 2025
Today's brief highlights key developments in space technology, military space activities, and satellite refueling initiatives. Discover the latest on GEO satellite refueling, Blue Origin's New Glenn, and more.
SJ-2B (12845)
COSPAR: 1981-093D | Alt Name: Shi Jian 2
DECAYED
Image
Additional Sources
Launch Details
Launch Date
September 19, 1981
Launch Site
JSC
Launch Pad
LA2B
Launch Vehicle
Feng Bao 1
Orbital Elements
NORAD ID
12845
International Designator
1981-093D
Decay Date
8/17/1982
Basic Satellite Info
Name
SJ-2B
Alternative Name
Shi Jian 2
Type
Payload
Status
Decayed
Owner
JGB7
Country
China
Constellation
N/A
Related Satellites
Major Events
N/A
Summary
SJ-2B, also known as Shi Jian 2, is a technology satellite launched on September 19, 1981, from the Jiuquan Satellite Launch Center (JSC) using the Feng Bao 1 launch vehicle. The spacecraft measures 1.1 meters in length and has a diameter of 1.2 meters with a span of 3.3 meters. It weighs 257 kilograms at launch and has a dry mass of the same weight. SJ-2B is equipped with four deployable fixed solar arrays and batteries for power generation. The satellite's shape consists of an octagonal cylinder with four panels. Its mission, owned by JGB7, was to conduct technological experiments in space. The spacecraft was manufactured by CAST (China Academy of Space Technology).
Physical Characteristics
Length
1.1
Diameter
1.2
Span
3.3
Dry Mass
257
Launch Mass
257
Shape
Oct Cyl + 4 Pan
Radar Cross Section
2.9
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
shijian erhao
Purpose
Technology
Mission
Technology
Manufacturer
CAST
Life Expectancy
Unknown
Bus
SJ-2
Configuration
Unknown
Motor
Unknown
Equipment
Unknown
Power System
4 deployable fixed solar arrays, batteries
ADCS
Unknown
Transmitter Frequency
Unknown
Satellite Articles
View All Posts »Learn more about satellites and other related topics.
Space Brief 21 Nov 2024
Today's brief covers influential space events including Space Force's interest in Starship, U.S. military constellation advancements, and technological developments in counter-drone capabilities.
X Report 31 Mar 2025
New experiments in space agriculture begin with Fram2 mission, a historic polar orbit flight, and a Starlink launch postponement.
X Report 3 Feb 2025
SpaceX prepares for another Starlink launch from Florida, while recent Starship incident raises environmental concerns.
X Report 3 Sep 2025
SpaceX successfully launched 24 Starlink satellites aboard a brand-new Falcon 9 rocket. The company aims for five missions this week, bolstering its satellite internet constellation.
X Report 8 Jan 2025
SpaceX sets sights on new frontiers with the imminent Starlink launch and upcoming Blue Ghost moon lander mission.
Amazon vs SpaceX and the Battle for the Best Satellite Internet Service
SpaceX and Amazon Are Playing for Keeps to Control Satellite Broadband and Connect the World. But Is There Room for Both in the Orbit?
Space Brief 14 Nov 2024
Today's brief covers potential shifts in Space Force's strategy, new milestones in military satellite programs, and advancements in ground systems for missile defense. We'll also highlight Rocket Lab's latest contract win and critical design reviews in drone technology.