Thanks to Jari's message and his reference to Sat-Tracks. The two
URL's below graphically describe my concerns described below.
http://www.geocities.com/CapeCanaveral/Galaxy/3070/Ir56.jpg
http://www.geocities.com/CapeCanaveral/Galaxy/3070/Ir56b.jpg
Anthony.
Anthony Ayiomamitis wrote:
> Folks,
>
> I have been meaning to throw in my two cents worth in the recent
> thread on looking for Iridium flares across the lunar surface but
> somehow I have been forgetting.
>
> My suspicion is that this would be an exercise in futility even
> though we could be dealing with identical magnitudes between the flare
> and the crescent moon at -8 mag or so (forget about the full moon and
> the -12.7 mag). What makes the photography of the Iridium flare possible
> is that we are capturing a moving object during the 20-40 second
> exposure. As a result, we do not have overexposure but simply a nice
> image across the film.
>
> Now, if we were to shoot for 20-40 seconds with the moon (any
> phase during its cycle) right smack in the middle, I seriously doubt the
> quality of the resulting image since the moon exposed for 20-40 seconds
> will certainly be unrecognizable. We should be getting a very serious
> blur of the stationary moon!
>
> I remember taking some night time photos a few years back of the
> Chicago downtown around the lake and included the full moon within the
> field of view for esthetics. Well, my four-second exposures turned out
> beatiful images of the intended skyline, buildings etc but the moon was
> a nice blurry circle. Now imagine doing this for 20 to 40 seconds?!
>
> One of the challenges involved with lunar photography is the
> imaging of the one-day old moon. However, its intensity is such that it
> does not require 20 to 40 seconds and, yet, one would be forced to shoot
> for something in this interval so as to record the complete Iridium
> flare.
>
> As much as it would be nice to have such a photo, I am willing to
> bet that the only way to accomplish such a feat is with a composite
> photo (one of the Iridium flare and a second multi-exposure of the lunar
> disk at a significantly different exposure).
>
> Anthony.
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