ISS color

Allen Thomson (
Wed, 24 Feb 1999 10:18:19 -0600

>As Ed Cannon mentioned in an earlier email, we had a very nice pass of
I>SS over Austin last night (1999-02-24 01:27 UTC).  Peak magnitude was
>about -1.5.

>The really interesting thing about this pass was the brilliant blue
>color.  ISS was a very easily distinguishable whitish-blue color just
>before and just after culmination, which slowly faded to bluish-white,
>then finally to white, after culmination.

That's interesting. A few evenings ago, we had an overhead pass of ISS and
it was distinctly reddish. I assumed that was because it was near the
earth's shadow, which it entered shortly after culmination.