This material is all copyright 1997 by Michael F. A'Hearn. It may be freely reproduced for non-commercial purposes with appropriate credit.
. This image
is a 90-second exposure near the beginning of nautical twilight. The blue
ion tail, extending into the trees on the left, is well separated from
the white dust tail. (23k JPEG)
. This image is
a 30-second exposure early in astronomical twilight. Both tails are
clearly visible. A faint hint of red near the top of the image is the
North America Nebula. (29k JPEG)
This image is
a 90-second exposure taken immediately after the image above. The reddish
area near the top of the image is the North America Nebula. (39k JPEG)
was taken well into twilight and is a 30-second exposure that has been
darkened in the computer. (25k JPEG)
is a 90-second exposure taken immediately after the preceding image and
artificially darkened in the computer. (29k JPEG)
These postperihelion images were taken from Anderson Mesa, the site of Lowell Observatory's principal telescopes near Flagstaff Arizona, on April 28.15 UT. They were taken with a 50-mm lens at f/2.0 on Kodak Ektachrome EHP1600 professional film. They were push processed 3 stops to yield an effective ASA rating of 3200.
image is a 20-second exposure. (177k JPEG)
image is a 40-second exposure. (226k JPEG)
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