X Report 4 Oct 2025
SpaceX continues to push forward with significant milestones, including the launch of additional Starlink satellites and progress on spectrum acquisitions.
ONEWEB-0257 (48975)
COSPAR: 2021-060J | Alt Name: OneWeb SL0257
Image
Additional Sources
Launch Details
Launch Date
July 1, 2021
Launch Site
VOSTO
Launch Pad
PU1S
Launch Vehicle
Soyuz-2-1B
Orbital Elements
NORAD ID
48975
International Designator
2021-060J
Epoch
Sat, 04 Jul 2026 01:12:07 GMT
Apogee
Calculating...
Perigee
Calculating...
Inclination
87.91°
Right Ascension
225.42°
Eccentricity
Calculating...
Argument of Perigee
97.89°
Period
109.37 min
Mean Motion
13.17 rev/day
Latitude
Calculating...
Longitude
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Altitude
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Velocity
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Polar Plot
3D Visualization
Basic Satellite Info
Name
ONEWEB-0257
Alternative Name
OneWeb SL0257
Type
Payload
Status
Operational
Owner
ONEWEBN
Country
United Kingdom
Constellation
N/A
Related Satellites
Major Events
N/A
Latest TLEs
1 48975U 21060J 26185.05008552 -.00000080 00000-0 -24258-3 0 9993
2 48975 87.9086 225.4218 0001982 97.8895 262.2460 13.16593543241800
Source: Celestrak
Summary
The ONEWEB-0257 satellite, also known as OneWeb SL0257, is a communication satellite manufactured by ONEWUS and owned by ONEWEBN. Launched on July 1, 2021, from VOSTO Launch Site, PU1S pad using the Soyuz-2-1B launch vehicle, it has an arrow bus configuration and operates with a Ku-Band payload for its mission purposes. The satellite measures 1.3 meters in length, has a diameter of 1 meter, and a span of 5 meters. It has a dry mass of 140 kilograms and was launched with a total mass of 148 kilograms. Equipped with solar arrays and batteries for power, it uses SPT-50 or BHT-350 Hall effect thrusters as its motor system. Its shape is described as Trapezoid+2 pan, and the expected operational lifetime is approximately seven years.
Physical Characteristics
Length
1.3
Diameter
1
Span
5
Dry Mass
140
Launch Mass
148
Shape
Trapezoid+2 pan
Radar Cross Section
Unknown
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
OneWeb L8-020
Purpose
Communication
Mission
Communication
Manufacturer
ONEWUS
Life Expectancy
+ 7 years
Bus
ARROW
Configuration
Arrow bus
Motor
SPT-50 or BHT-350 Hall effect thrusters
Equipment
Ku-Band payload
Power System
solar arrays, batteries
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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