[amsat-bb] Re: ISS Height Profiles @ Heavens-Above.com
rwmcgwier at gmail.com
Fri Jan 13 07:59:55 PST 2012
These maneuvers are not done continuously around the orbit. They are
typically done in burns done at apogee and perigee if all they are doing is
raising/lowering the orbit and minimizing any changes to the orbital plane.
Think of it like this. When I turn the propulsion on, I do not change my
CURRENT instantaneous position while I am burning. What I change is my
velocity. So if I burn the motor at apogee and the motor is firing along
my velocity vector, then I am speeding myself up. THIS RAISES PERIGEE
because I will have the same height but my speed will cause the position on
the OTHER SIDE of the orbit to be raised. Similarly, I slow down at
apogee, perigee is lowered. If I speed up at perigee, apogee is raised,
Did this help?
On Fri, Jan 13, 2012 at 10:28 AM, Fabio Azzarello <iw8qku at amsat.org> wrote:
> Hello everybody,
> ISS heights plots are available at the following link:
> I've noticed that Apogee and Perigee heights have different behaviour
> during reboosts (look at mid September for example),
> could anybody help me to understand why?
> Thanks in advance,
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