I presume window for usa 193 for 35 s will be roughly good for 26.0355 e 30.710 s ? How frequently do you update http://www.io.com/~mmccants/tles/classfd.zip For usa193 I am forecasting with orbitron from there. Regards Gerhard -----Original Message----- From: Ted Molczan [mailto:ssl2molcz@rogers.com] Sent: Tuesday, February 12, 2008 5:01 AM To: seesat-l@satobs.org Subject: USA 193 visibility windows Below are estimated visibility windows of USA 193 (aka 06057A / 29651) for the latitudes of the positional observers known to me. A visibility window is a period of time during which a satellite is visible in an observer's morning or evening twilight sky. Period Lat Time Dir Feb 05 - Feb 11 44 N Morning SB Feb 07 - Feb 13 30 N Morning SB Feb 13 - Feb 18 30 N Evening NB Feb 16 - Feb 22 44 N Evening NB Feb 17 - Feb 29 51 N Evening NB Feb 18 - Mar 02 56 N Evening NB Feb 20 - Feb 27 35 S Morning SB Mar 03 - Mar 07 56 N Evening SB Mar 01 - Mar 08 51 N Evening SB Mar 04 - Mar 10 44 N Evening SB Mar 08 - Mar 11 30 N Evening SB Mar 14 - Mar 17 35 S Morning NB SB and NB denote southbound and northbound passes, respectively. Not all observers near a given latitude will have good passes on each day of a window. A few will have passes culminating high above the horizon, most will have much lower elevation passes. I am near latitude 44 N, so my morning south-bound window ended today. The same window closes about Feb 13 for observers near 30 N, for whom an evening northbound window opens about the same day. That window will move progressively northward, opening for observers at 44 N on Feb 16. Collectively, observers at or north of 44 N will have evening visibility until about March 10. During the final few days before decay, currently estimated to occur within about one week of March 18, observers near 35 S will have morning visibility. Since there are few positional observers in the southern hemisphere, we are likely to lose the object after about March 10, unless they are interested to observe it, and fortunate to have reasonably high-elevation passes and good weather. Ted Molczan ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.20.0/1268 - Release Date: 2/9/2008 11:54 AM ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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