A pair of nearly simultaneous and parallel Iridium satellite flares, on October 9, 2017, as they descended into the north. The left or westerly flare

- Image ID: PRK01W
A pair of nearly simultaneous and parallel Iridium satellite flares, on October 9, 2017, as they descended into the north. The left or westerly flare
Alan Dyer / VWPics / Alamy Stock Photo
Image ID: PRK01W
A pair of nearly simultaneous and parallel Iridium satellite flares, on October 9, 2017, as they descended into the north. The left or westerly flare was much brighter and with a sharp rise and fall in brightness. While it was predicted to be mag. -4.4 I think it got much brighter, perhaps mag -7, but very briefly. The right flare was predicted to be ,ag. -3.3 which was about correct. These are Iridium 90 (left) and Iridium 50 (right). I used GoSatWatch app to look up the predictions and satellite identities. Several other satellite trails are also in the picture. This is a stack of 40+ exposures each, 2 seconds at 1-second intervals, with the Sigma 24mm lens at f/1.4 and Nikon D750 at ISO 6400.