Space Brief 31 Jul 2025
Today's Space Brief brings updates on the U.S. Space Force's upcoming missions, in-space technology strategies, the challenges faced by new launchers, and advancements in satellite communication.
ONEWEB-0287 (49077)
COSPAR: 2021-075C | Alt Name: OneWeb SL0287
Image
Additional Sources
Launch Details
Launch Date
August 21, 2021
Launch Site
Launch Pad
LC31
Launch Vehicle
Soyuz-2-1B
Orbital Elements
NORAD ID
49077
International Designator
2021-075C
Epoch
Fri, 03 Jul 2026 22:45:53 GMT
Apogee
Calculating...
Perigee
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Inclination
87.91°
Right Ascension
2.53°
Eccentricity
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Argument of Perigee
80.10°
Period
109.29 min
Mean Motion
13.18 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-0287
Alternative Name
OneWeb SL0287
Type
Payload
Status
Operational
Owner
ONEWEBN
Country
United Kingdom
Constellation
N/A
Related Satellites
Major Events
N/A
Latest TLEs
1 49077U 21075C 26184.94853381 .00000072 00000-0 15352-3 0 9992
2 49077 87.9134 2.5308 0002083 80.1030 280.0336 13.17650641235831
Source: Celestrak
Summary
The ONEWEB-0287 satellite, also known as OneWeb SL0287, is owned by OneWebN and was manufactured by ONEWUS. It uses an Arrow bus configuration and has a mission focused on communication. Launched from the TYMSC launch site at LC31 using a Soyuz-2-1B launch vehicle on August 21, 2021, it reached stability one day later. The satellite measures 1.3 meters in length with 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 a Ku-Band payload, it is powered by solar arrays and batteries and uses SPT-50 or BHT-350 Hall effect thrusters for propulsion. Its shape is described as Trapezoid+2 pan, and it is expected to have a lifetime of 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 L9-033
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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