[amsat-bb] Re: ISS Height Profiles @ Heavens-Above.com

Fabio Azzarello iw8qku at amsat.org
Fri Jan 13 10:22:11 PST 2012

Thanks Robert!
Clear now.


On Fri, Jan 13, 2012 at 4:59 PM, Robert McGwier <rwmcgwier at gmail.com> wrote:

> 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?
> Bob
> 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:
>> http://www.heavens-above.com/OrbitHeight.aspx?satid=25544&startMJD=55610&lat=43&lng=11
>> 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,
>> 73s
>> Fabio
>> iw8qku/5
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> --
> Bob McGwier
> Facebook: N4HYBob

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