- Jan 31, 2009
- Reaction score
Saw the film. Let's jut say it's mandatory viewing for any regular Orbitnaut!
The destruction is all sequenced on 90 minute orbits (= 5400 seconds) repeating on clockwork. Sounds reasonable, right, as we would recognize this is a typical T time for orbiting at ISS's altitude.
Except why the repeat?! If the debris was going the opposite way to us, it would meet us in 45 mins, not 90 mins. If it was going in our direction, it would not meet every 90 mins. Any other angle, we'd also meet it every 45 mins. The only way we would meet it every 90 mins would be if it were stationary, but then it would fall to the Earth.
Ho hum ...
But it was a gorgeously shot movie nonetheless.
Yeah, I was wondering about that. Would it work if the debris was in an elliptical orbit coming down from a higher altitude with a roughly 90 minute orbital period? Very unlikely, but wouldn't that give you an intercept every 90 minutes, assuming a debris cloud a few hundred KM across with the Hubble, ISS, and Tiangong all within a couple hundred KM of each other?