double satellite, one flared
Taken by Olivier Staiger on July 10, 2015 @ just south of Vétroz in the Swiss Alps
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  Camera Used: Canon Canon EOS 600D
Exposure Time: 60/1
Aperture: f/2.8
ISO: 800
Date Taken: 2015:07:10 22:07:16
 
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Details:
It was around midnight local time . I was out , shooting a picture of Ursa Major, the Big Dipper, above a group of trees, and set the camera for a 1 minute exposure. During the exposure I looked in the same direction and suddenly noticed that there were TWO satellites trailing ... and while I watched them one of them flared brightly, similar to what I have seen with Iridium flares. then when I looked at the picture I realized that my 1-minute expoure of the Big Dipper accidentally also captured the two satellites, with one of them flaring... I estimate the flare was nearly as bright as Venus, so around mag. -3 . Was it an Iridium , with a trailing Iridium ? or some other satellite ? heavens-above application on my android phone shows an iridium satellite shortly before midnight but the heavens-above website on laptop does NOT show that iridium flare... weird.
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Did you check CalSky.com prediction website?
It shows much more prediction of Iridium flares than Heavens-above, including a flares from spare satellite.
I think the close parallel flare trails of your photo are a double iridium flare.
Some spare satellites out of operation fly on almost the same path as satellites in operation with a short distance. Some of them are so close that we can see they fly sequentially on a similar way and their maximum brightness time occurs within only 5 to 15 seconds. So we can take a photo of such a double iridium flare in one minute exposure. Once I took a movie of a double iridium flare.
The difference of their brightness is attributed to the satellite orientation.
Posted by shiram 2015-07-10 21:49:57
 
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