At 05:07 PM 2/25/2010 +0000, Bob- W7LRD w7lrd@comcast.net wrote:

Hello Is there a "easy" way of figuring out where/when a given apogee will at a given lat.long? I want to try to predetermine when the apogee will be on AO-7 to favor the northern hemisphere. To "maybe" help in dx contacts. The difference is only bout 17km in altitude, it just might streeeetch the footprint enough. Also just how much does the 17km add to the footprint? 73 Bob W7LRD

Bob,

I don't think the difference between apogee and perigee on a LEO with a fairly circular orbit really makes that much of difference. So instead of the apogee, what you really want to know are all the longitudes where the sub satellite point reaches it's most northern most latitude. You could probably write on script for filtering the output of some of the older satellite tracking programs that only makes a date-time-latitude-and-longitude entry whenever the SSP gets above a certain latitude.

KB7ADL