2# positron
翻滚？？理解不了啊，还有亮度预报
Tumbling IridiumThe prediction of Iridium flares is only possible in case the satellite is still controlled. There are already several satellites, that are out of control and not used for predictions. Hence it happens by accident, that the mirroring antennas are in the right geometry with you and still produce a show. Actually, this presentation is even more striking, since it consists of a periodic series of dazzling flashes. Inbetween, you can track the satellite with binoculars. CalSky predicts the opportunities of the show of the tumbling Iridiums. Each of the tumling Iridiums has its own characteristic flashing pattern - some with a period of only 1 seconds, where others flash every 40 seconds.
You find the transit times of these satellites on this page: wait and try to estimate the flashing period.
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Thursday 25 June 2009TimeObject (Link)Event Observer SiteUser Site, China
WGS84: Lon: +126d22m48.0s Lat: +45d31m48.0s Alt: 202m
All times in UTC+820h04m44s Iridium 24 tum
(25105 1997-082-B)
→Ground track →Star chartDescending Orbit. Earth revolutions since launch: 60383.4
Flashes: Period 15 sec, with add. irreglar flashes
Appears 19h58m29s 11.3mag az:340.3° NNW horizon
Culmination 20h04m44s 9.7mag az:283.2° WNW h:16.3°
distance: 1897.1km height above Earth: 767.8km elevation of sun: -6°
Disappears 20h10m57s 9.1mag az:225.5° SW horizon
20h11m54s Iridium 71 tum
(25320 1998-026-B)
→Ground track →Star chartDescending Orbit. Earth revolutions since launch: 58464.4
Flashes: Irregular, interval between flashes from 2-140s
Appears 20h05m28s 11.3mag az:341.6° NNW horizon
Culmination 20h11m54s 9.3mag az:282.0° WNW h:18.4°
distance: 1796.4km height above Earth: 772.1km elevation of sun: -7°
Disappears 20h18m18s 9.0mag az:222.0° SW horizon
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