"William C. Keel" wrote in message
...
When you see doubles like that, one is
generally a backup in lower orbit (visibly moving faster).

Yes, I noticed that but forgot to mention it.

I got a shot
once showing twin Iridium flares and the trail of ISS.

Cool!

The backups are noteworthy in that if you're on the centerline their
flares can reach magnitude -9.

I've seen a couple of -8 flares. Had to subdue the reflex of putting a hand
up to shield my eyes.

Clear Skies,
Craig in Tampa