You beat me to it Bob...I was going to suggest you might try an Iridium in order to create a reference image...after all flares fom iridium are commonplace , but not so ISS. Great work John ----- Original Message ----- From: "Bob Christy" <rdc@zarya.info> To: "'Seesat-L'" <SeeSat-L@satobs.org> Sent: Thursday, January 10, 2008 10:02 AM Subject: RE: Light Curve from Satellite Trail > Someone mailed a response suggesting that it might be interesting to see > an > Iridium flare plotted. > > I don't have an image of my own but I selected one from the many available > on the Internet. To avoid any copyright/ownership issues, I will not > identify the original. The result is here: > http://www.zarya.info/Results/iridiumplot.jpg > > The curve is pretty symmetrical and it has spikes caused by stars on the > line of the trail. The flat top is caused by the image saturating around > the > brightest point. > > Like the ISS curve, there is a step to the right on the peak but having > looked closely at the original image, it is a genuine feature in that the > rise and fall are not quite symmetrical. The step may be a processing > aretefact that can be avoided by more-careful processing than my quick > dabble. > > Bob Christy > >> -----Original Message----- >> From: Bob Christy [mailto:rdc@zarya.info] >> Sent: Wednesday, January 09, 2008 7:52 PM >> To: Seesat-L >> Subject: Light Curve from Satellite Trail >> >> As an experiment, I set out to derive a light curve from a >> trailed image of the ISS. It worked quite well: >> http://www.zarya.info/Tracking/ISS/20070812vis.php >> >> BobChristy >> Lincoln, UK >> 53.2233 deg North >> 0.6004 deg West >> Height 59m > > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.5.516 / Virus Database: 269.19.0/1216 - Release Date: > 09/01/2008 > 10:16 > > > ------------------------------------------------------------------------- > Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: > http://www.satobs.org/seesat/seesatindex.html > > > ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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