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OK...
So, knowing the distance between observers and image scale (should be known from plate solver) we can measure angular distance of object (~22° as per attachment) and calculate distance.
Very rough estimation is H=d/(2*tg(alpha)) = ~1540km.
The actual distance is smaller, as I did not take into account the height above horizon..... was it ~11°? or more?
Gunnedah is at 31°....
Last edited by bojan; 20-09-2018 at 07:24 PM.
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