80km is the altitude when the re-entry interface really starts to happen, however, with analytical tools (such as HEAVENSAT), you won't get a true estimation of when that will occur. Other tools such as SatEvo will "propagate" the orbit (still an analytical tool) to get a closer approximation. Based on numerical tools that I'm running, the decay time is closer to 17 JAN +/- 2 days. Paul Salanitri On Wed, Jan 4, 2012 at 4:55 AM, abdolreza lavari <a.lavari@gmail.com> wrote: > Hi everyone > With considering USSTRATCOM TLEs from epoch 11349.93297346 to > 12002.90365258 and extrapolating I have obtained a graph (height of > perigee above sphere versus time)by HEAVENSAT . > if we suppose minimum altitude for satellite burning to start at > elevations between 150 to 155 km above see level (like ROSAT > satellite)decay time can be 13 JAN +-2 day. > Really what is the minimum altitude for this satellite to start reentry? > > http://haftaseman.ir/images/phobos10.gif > _______________________________________________ > Seesat-l mailing list > http://mailman.satobs.org/mailman/listinfo/seesat-l > -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mailman.satobs.org/mailman/private/seesat-l/attachments/20120104/f061b56c/attachment.html _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l
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