Falcon 9 Booster Hits Record 35th Flight | KeepTrack X Report
A Falcon 9 booster sets a reusability record on its 35th flight during the Starlink 10-35 mission, the constellation's 53rd dedicated launch.
SL-12 R/B(2) (21135)
COSPAR: 1991-014D | Alt Name: Blok DM-2 No. 49L
Image
Additional Sources
Launch Details
Launch Date
February 28, 1991
Launch Site
Launch Pad
LC81/23
Launch Vehicle
Proton-K/DM-2
Orbital Elements
NORAD ID
21135
International Designator
1991-014D
Epoch
Fri, 03 Jul 2026 21:39:21 GMT
Apogee
Calculating...
Perigee
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Inclination
11.85°
Right Ascension
331.29°
Eccentricity
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Argument of Perigee
148.58°
Period
1392.21 min
Mean Motion
1.03 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-2 No. 49L
Type
Rocket Body
Status
Space Junk
Owner
RVSN
Country
USSR
Constellation
N/A
Related Satellites
Major Events
N/A
Latest TLEs
1 21135U 91014D 26184.90233475 -.00000168 00000-0 00000-0 0 9997
2 21135 11.8463 331.2853 0024508 148.5800 216.2237 1.03432503133525
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
6.3
Diameter
3.7
Span
6.3
Dry Mass
2440
Launch Mass
17490
Shape
Cyl
Radar Cross Section
1.9816
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
11S861 No. 49L
Purpose
Unknown
Mission
Unknown
Manufacturer
NPOE
Life Expectancy
Unknown
Bus
Blok DM
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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