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Bad." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 10 Jun 2024 12:15:16 -0000 On 11/06/2024 12:04 am, David Lang wrote: > As I understand it, Starlink does not have ground stations transmit > towards the geostationary satellites, they only target the starlinks > when they are not in line to avoid exactly this problem) Correct. > >> Conventionally, if you had to communicate your re-entry video or >> audio feed to a ground station, you had to communicate *through* that >> cone's wall. Similarly, if you wanted to go "up", you had to go to a >> TDRSS satellite, of which there were only a small number in orbit - >> and the one visible to you would have been on the other side of the >> plasma cone wall with high probability. With Starlink, you have >> potentially a few dozen satellites within field of view, and the >> chances of having one within view out the back of the cone are >> relatively good (but not guaranteed). The other day, they got lucky >> that the star(link)s lined up ;-) > > As I underand it, it's not just luck, the Starship is so much larger > than anything else that the plasma does not just wrap around the craft > and close up behind it, the sheer size of the craft gives the plasma a > chance to cool a bit (and you can see that in the videos) That'll probably help, yes. > > Also, if it was 'luck' then they were lucky on both Starship reentry > flights (and since the ship was tumbling during flight 3, that would > be saying a lot) I guess the problem is hard to quantify - essentially you have to have a Starlink satellite that's within the steering cone of one of the phased arrays on Starship AND the path to which doesn't lead through a cone wall AND that's been assigned to serve that particular phased array AND that needs to work out through handovers to other satellites for your entire flight. That's probably possible a large percentage of the time given the number of sats about now, but perhaps not 100% (yet), especially around tropical latitudes where satellite density is about half of what you get in the 30's to mid-50's. And yes I guess they were probably lucky in that sense, yes. -- **************************************************************** Dr. Ulrich Speidel School of Computer Science Room 303S.594 (City Campus) Ph: (+64-9)-373-7599 ext. 85282 The University of Auckland ulrich@cs.auckland.ac.nz http://www.cs.auckland.ac.nz/~ulrich/ ****************************************************************