On Thursday, 20 Dec 2001, Anthony Ayiomamitis <anthony@perseus.gr> wrote: > > Subject: Please explain ... double flare by Ir 81 > > Dear List, > > I have something new which is perplexing and I would appreciate > some feedback. Rob's IridFlar is generating a double flare by the same > Iridium satellite in the space of a few seconds and I would appreciate > some rationale behind this phenomenon. > > The first flare will start at 7:07:39 and last 4 seconds on Dec > 27/01 ... the second flare will start at 7:07:45 and last 6 seconds ... > the respective magnitudes are -2.4 and -0.6 which should (?) be > sufficiently bright for a photo at that time of the morning. > > In browing through my list of predictions, I see a couple of > other opportunities about 1-2 minutes apart for the week after the above > flare which suggests that something is at play. > > Anthony. > I've noted similar phenomena in my Iridflar predictions and in every case, one of the flares was a solar panel flare (denoted in the output by "S") and the other a "normal" main mission antenna flare. For example, here is Iridflar's "brief" output for this coming Saturday morning's Iridium 34 ... Latitude: 40.10751 Longitude: -74.23123 Altitude: 80.0 ft Time Zone: UTC -5.0 h Local Local Iridium Sun Flare Maximum Flare Ird Day Date Time Azm El Rnge N I Azm Elv MMA Mag Latit. Longit. # S ----------------------------------------------------------------------------- Sat 2001-12-22 5:07:15 298 66 527 A L 101 -23 S -1 40.157 -74.826 34 Sat 2001-12-22 5:07:15 298 66 527 A L 101 -23 S -1 31.6 mi W 34 Sat 2001-12-22 5:07:19 302 65 530 A L 101 -23 S 0 40.425 -74.804 34 Sat 2001-12-22 5:08:43 342 41 699 A L 102 -22 R 2 39.143 -74.070 34 Sat 2001-12-22 5:08:59 345 36 750 A P 102 -22 R -3 11.6 mi E 34 Sat 2001-12-22 5:09:18 348 32 809 A P 102 -22 R 2 40.975 -73.956 34 ----------------------------------------------------------------------------- The -1 magnitude solar panel flare is followed in less than two minutes by a -3 magnitude "normal" flare. Clear and dark skies! Ed Light Lakewood, NJ, USA N 40.1075, W 074.2312, +24 m (80 ft) ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www.satellite.eu.org/seesat/seesatindex.html
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