[amsat-bb] Re: Odd Question

Jim Jerzycke kq6ea at verizon.net
Mon Sep 23 22:04:43 PDT 2013

Since the path that the launch vehicle will take is very well defined 
(unless something goes wrong!), and the paths of most objects that would 
intersect this path can be predicted, it becomes a juggling act to get a 
time when the launch vehicle will have a clear path, and your ground 
assets are available.

Since it takes a certain amount of time to get the launch vehicle ready, 
you work "backwards" from when you know your path will be clear on your 
trajectory to determine when you start your countdown.

The launch provider I work for has several people who do nothing but 
plan things like this, in coordination with USSTRATCOM, NASA, the FAA, 
the European Space Agency, the Russian Space Agency, and all the other 
other launch providers.

In the 9 years I've been doing my part (Communications, Range, and 
Telemetry) we've only had one "external" hold, and that was caused by 
NASA having to move the ISS a bit because the ISS was going to have a 
close approach of some space junk.

It's called a COLA (COllision Avoidance) hold, and if everybody does 
their planning properly, doesn't usually cause a problem.

One of the things considered is the ascent speed of the launch vehicle, 
as it's going pretty fast during it's passage through various altitudes.


73, Jim  KQ6EA

On 09/24/2013 04:22 AM, MICHAEL wrote:
> For the longest time I have been wondering how a satellite is placed in
> orbit without hitting anything else? I have seen pictures of all the stuff
> circling the Earth and it just baffles me how anyone can get anything in
> orbit  without hitting anything. Can anyone explain this?
> Mike/N8GBU
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