Optical Intersatellite Link (OISL)
The laser-based crosslinks that turn Starlink into a mesh, anchor the SDA Transport Layer, and just made their GPS debut on GPS III SV10 - quietly rewriting how data moves through space.
SDA_1667 (65977)
COSPAR: 2025-230D | Alt Name: N/A
Image
Additional Sources
Launch Details
Orbital Elements
NORAD ID
65977
International Designator
2025-230D
Epoch
Sun, 19 Jul 2026 11:26:21 GMT
Apogee
Calculating...
Perigee
Calculating...
Inclination
81.30°
Right Ascension
182.29°
Eccentricity
Calculating...
Argument of Perigee
92.62°
Period
104.24 min
Mean Motion
13.81 rev/day
Latitude
Calculating...
Longitude
Calculating...
Altitude
Calculating...
Velocity
Calculating...
Polar Plot
3D Visualization
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Basic Satellite Info
Name
SDA_1667
Alternative Name
N/A
Type
Payload
Status
Operational
Owner
SDA
Country
United States
Constellation
N/A
Related Satellites
Major Events
N/A
Latest TLEs
1 65977U 25230D 26200.47663553 .00000117 00000+0 99189-4 0 9993
2 65977 81.2986 182.2919 0001137 92.6152 267.5133 13.81442308 38247
Source: Celestrak
Summary
Apologies, there is no summary for this satellite yet. I am working to generate these for every object in the catalog, but it is going to take time.
Physical Characteristics
Length
0.6
Diameter
0.4
Span
3.6
Dry Mass
400
Launch Mass
400
Shape
Box + panels
Radar Cross Section
Unknown
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
SDA T1TL-C-04
Purpose
Unknown
Mission
Unknown
Manufacturer
LMSSD/TERRAN
Life Expectancy
Unknown
Bus
LM-T1TL
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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