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请问Tumbling Iridium是什么意思?

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phenix 发表于 2009-6-25 08:44 | 显示全部楼层 |阅读模式 来自: 中国–黑龙江–佳木斯 联通

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calsky卫星预报的一个栏目,预报的内容都是些亮度很低(8、9等开外)的卫星,不知道是什么意思,请达人帮忙解惑,多谢了。
positron 发表于 2009-6-25 10:47 | 显示全部楼层 来自: 中国–北京–北京 鹏博士BGP
1# phenix

应该是说铱星的某个状态。
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 楼主| phenix 发表于 2009-6-25 15:22 | 显示全部楼层 来自: 中国–黑龙江–佳木斯 联通
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.

Display daytime passes as well


                               
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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+8
20h04m44s Iridium 24 tum
(25105 1997-082-B)

→Ground track →Star chart

                               
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Descending 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 chart

                               
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Descending 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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幽哎浮欧 发表于 2009-7-14 18:18 | 显示全部楼层 来自: 中国–四川–达州 电信
好深奥的词汇
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rongwenqi 发表于 2009-7-22 15:32 | 显示全部楼层 来自: 中国–河北–张家口 联通
支持2楼的观点.

  会不会是铱星某种著名的状态.可是那些人造卫星?
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shiaki 发表于 2009-7-22 23:28 | 显示全部楼层 来自: 中国–浙江–杭州 电信
是失去控制而无法调整姿态的卫星.字面意思是翻滚的.

铱星很亮的原因是有天线面板可以反射日光,而且天线面板的指向我们是可以知道的.翻滚的铱星因为天线面板方向不确定所以多数很暗.偶尔也有很亮的时候,那是人品爆发.
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