Arianespace va250 Inmarsat GX5

solly

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success launch tonight finaly
 

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hvdh

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Inmarsat GX5 is almost stationary according TLE, near 80.4°E now without inclination and slowly drifting East.
Possibly towards 83.5°E that has an Inmarsat slot registration, Inmarsat 5F4 was already there in 2017 for testing.

Tiba-1 inclination down to 0.5°, still orbiting the whole earth but shouldn't take too long either to reach destination.
 

hvdh

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Tiba-1 arrived at 35.5°E.
 

william-1

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hvdh

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Inmarsat GX5 spent the typical 3 months at 83.8°E, to reserve that slot.
Some sources say 11°E will be the operational slot, to serve Europe & Middle East.
But now GX5 is already near 5°E, still drifting 2.5°/day.
Maybe going for another slot reservation, like 15.5°W that was abandoned in Feb 2019 when Inmarsat-3 F2 reached end-of-life.
 

hvdh

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Inmarsat GX5 arrived at 28.0°W, this location is registered at ITU but was never occupied by Inmarsat before, AFAIK.
 

hvdh

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Inmarsat GX5 stayed at 28.0°W for 3 months (slot reservation), and arrived at 11.0°E three days ago.
Will this be the final location then (see my post above)?
This 11.0°E slot was reserved already a while ago by GX4 (now at 56.5°E).
 

hvdh

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Indeed GX5 is still at 11.0°E.

Meanwhile, the next generation Inmarsat GX6A (or Inmarsat-6 F1) was launched from Tanegashima, Japan on 22 Dec 2021.
Cat.nr. 50319, 2021-128A (I didn't find a topic here for this launch).
This one has electric propulsion, and took over half a year to arrive yesterday at the 28.0°W testing location.
 
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s-band

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Indeed GX5 is still at 11.0°E.

Meanwhile, the next generation Inmarsat GX6A (or Inmarsat-6 F1) was launched from Tanegashima, Japan on 22 Dec 2021.
Cat.nr. 50319, 2021-128A (I didn't find a topic here for this launch).
This one has electric propulsion, and took over half a year to arrive yesterday at the 28.0°W testing location.
I took a look on Ka 17.5-20.7 RHCP but could not see anything at the time of posting. However, SBIRS-GEO 2 is passing that position and is very strong. When set to 28W, 20252.36 RHCP peaked on one of the side lobes of the 1.2m dish at about -25dB from the main beam. The screen capture is from n2yo.com with SBIRS highlighted.

Screen Shot 2022-07-16 at 09.22.49.png
 

hvdh

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hvdh

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Inmarsat-6 F1 left 28.0°W mid-December 2022, and arrived a few days ago at 83.75°E.
At ITU 83.5°E is listed, but that position is occupied already by the Chinese TJS-4.

This should be the final location: "I-6 F1 will provide coverage over the Indian Ocean and will be supported by two new ground station antennas in Western Australia – Perth and Merredin".
 
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