Jonathan's Space Report
Jonathan's Space Report is a comprehensive resource for space launch and satellite data, compiled by astrophysicist Dr. Jonathan McDowell.
SL-4 R/B (11486)
COSPAR: 1979-073B | Alt Name: Soyuz-U 47-759 Blok-I
DECAYED
Image
Additional Sources
Launch Details
Launch Date
August 11, 1979
Launch Site
Launch Pad
LC31
Launch Vehicle
Soyuz-U
Orbital Elements
NORAD ID
11486
International Designator
1979-073B
Decay Date
8/15/1979
Basic Satellite Info
Name
SL-4 R/B
Alternative Name
Soyuz-U 47-759 Blok-I
Type
Rocket Body
Status
Space Junk
Owner
RVSN
Country
USSR
Constellation
N/A
Related Satellites
Major Events
N/A
Summary
A rocket body, also commonly referred to as an upper stage or spent rocket stage, is the structural shell left behind after a rocket has delivered its payload to orbit. These large and often heavy pieces of space hardware can remain in orbit for years, posing significant collision hazards as part of the growing space debris problem. If left uncontrolled, rocket bodies have the potential to reenter Earth's atmosphere unpredictably, which can lead to falling debris in populated areas. Additionally, they risk colliding with operational satellites or the International Space Station, creating more debris and putting human life at risk.
Physical Characteristics
Length
6.7
Diameter
2.7
Span
6.7
Dry Mass
2350
Launch Mass
2350
Shape
Cyl
Radar Cross Section
Unknown
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
11S510
Purpose
Unknown
Mission
Unknown
Manufacturer
PROG
Life Expectancy
Unknown
Bus
Blok-I
Configuration
Unknown
Motor
Unknown
Equipment
Unknown
Power System
Unknown
ADCS
Unknown
Transmitter Frequency
Unknown
Satellite Articles
View All Posts »Learn more about satellites and other related topics.
NASA Tests Artemis 2 Fueling, Saudi Unveils DebriSolver Winners | KeepTrack Space Brief
NASA conducts critical Artemis 2 rocket fueling test. Saudi Space Agency announces global DebriSolver competition winners. SpaceX and Bezos push orbital data center plans.
Starship Flight 12 Targets May 19 with Redesigned Ship | KeepTrack X Report
SpaceX targets May 19 for Starship Flight 12 debut, while CRS-34 delivers 6,500 lbs of cargo to ISS aboard a Falcon 9.
Falcon Heavy Attempts ViaSat-3 F3 Launch After Weather Scrub | KeepTrack X Report
SpaceX's Falcon Heavy targets a second launch attempt for ViaSat-3 F3, while Artemis III slips to late 2027 and Musk earns a Mars milestone bonus.
Starlink Hits 10,000 Satellites in Orbit, X Report 17 Mar 2026
How many Starlink satellites are in orbit in 2026? SpaceX passed 10,000 after the Starlink 17-24 launch, with 10,020 in orbit and 11,529 launched.
The Afternoon a Blurry Smudge Turned Pluto Into a Double Planet
On 22 June 1978, an astronomer at the U.S. Naval Observatory looked at photographic plates that had been stamped 'image defective' and noticed a small bump on the side of Pluto. The bump was a moon, and finding it finally let astronomers weigh a planet that had fooled them for half a century.
Space Brief 2 Oct 2025
Highlighting ExLabs' Space Force contract, Starlink advances, and developments in orbital communication tech.
The Civilian Space Traffic System America Almost Didn't Build
For nearly two decades, the U.S. Air Force and Space Force have been the world's unofficial civilian space traffic control system. The Department of Commerce's Traffic Coordination System for Space (TraCSS) is now taking over that job for commercial satellite operators - in stages, against persistent congressional pressure to kill the program, and with Department of Defense advocates pushing to make it happen before it is too late.