Satellite cluster
Taken by Dennis Simmons on December 3, 2025 @
Brisbane, Australia
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Camera Used: Unavailable Unavailable
Exposure Time: Unavailable
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Date Taken: 2025:12:04 15:09:24
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Details:
There is a lot of stuff up there!
I was looking at the “Input Satellites” function in The Sky X Professional (TSX) to check on the location of the ISS and must have inadvertently also ticked the “Active Geosynchronous – Communication Satellites” Check Box.
When I then looked at TheSky Chart I saw all these objects clustered in groups along the Celestial Equator, so decided to slew over to a cluster and grab a 10 sec exposure, tracking on a satellite at a Custom Rate in TSX.
This ensures that the object would remain stationary in the FOV whilst the stars trailed.
After the exposure finished, I saw that I had recorded 5 satellites amongst the star trails, so kicked off a 60 sec exposure.
I was able to determine details of the 5 satellites which were Japanese, managed by the Broadcasting Satellite System Corporation (B-SAT), a Japanese corporation established in April 1993 to procure, manage and lease transponders on communications satellites.
You never know who is watching until you look up…
Dennis.
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