Space Brief 18 Jun 2025
Today's updates cover crucial developments in satellite licensing reforms, defense cybersecurity, and AI integration within government sectors.
SL-12 R/B(2) (25900)
COSPAR: 1999-047E | Alt Name: Blok DM-2M No. 4L
Image
Additional Sources
Launch Details
Launch Date
September 6, 1999
Launch Site
Launch Pad
LC81/23
Launch Vehicle
Proton-K/DM-2M
Orbital Elements
NORAD ID
25900
International Designator
1999-047E
Epoch
Fri, 03 Jul 2026 20:35:36 GMT
Apogee
Calculating...
Perigee
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Inclination
14.52°
Right Ascension
359.07°
Eccentricity
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Argument of Perigee
63.36°
Period
1437.93 min
Mean Motion
1.00 rev/day
Latitude
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Longitude
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Altitude
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Velocity
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Polar Plot
3D Visualization
Basic Satellite Info
Name
SL-12 R/B(2)
Alternative Name
Blok DM-2M No. 4L
Type
Rocket Body
Status
Space Junk
Owner
KHRR
Country
Russia
Constellation
N/A
Related Satellites
Major Events
N/A
Latest TLEs
1 25900U 99047E 26184.85806339 -.00000320 00000-0 00000-0 0 9994
2 25900 14.5199 359.0651 0102203 63.3618 128.8932 1.00143782 98142
Source: Celestrak
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
7.1
Diameter
3.7
Span
7.1
Dry Mass
2560
Launch Mass
17610
Shape
Cyl
Radar Cross Section
1.9952
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
11S861-01 No. 4L
Purpose
Unknown
Mission
Unknown
Manufacturer
RKKE
Life Expectancy
Unknown
Bus
Blok DM2
Configuration
Unknown
Motor
Unknown
Equipment
Unknown
Power System
Unknown
ADCS
Unknown
Transmitter Frequency
Unknown
Map
Next Pass
Azimuth Elevation Time (Local)
Start Azimuth
Max Elevation
Stop Azimuth
Time Until
Pass Duration
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