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Ask Images of Comet Hale-Bopp

Click on any of the pictures to pull up a larger version.

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Observer: Bengt Ask
Location: Svalov, Sweden
Date: March 17, 1997 01:50-03:35 UT

These images were obtained on March 17, 1997 under a reasonably dark sky using Fuji Super G 800 Plus film. The site is located about 5 km from Svalov in southern Sweden (latitude 55d54' North).

The first picture was taken at 01:50 UT using a 50 mm lens stopped down to somewhere between f/2,8 and f/4 in order to reduce the effects of lens aberrations. Exposure time 8 minutes.

Picture number two was shot at 02:20 UT with a short telephoto lens (f=135 mm) stopped down one step to f/4. The film was exposed to the light from the comet for 12 minutes.

The third image was taken at 03:35 UT just before the sunlight started to interfere with my photo session. For this reason the exposure time was limited to 6 minutes and the 400 mm lens was used wide open at f/5.6.

On March 17, 1997, the second picture above (ask4.jpg) was selected by NASA as the main illustration of the Comet Hale-Bopp Home Page maintained by the Jet Propulsion Laboratory.


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Observer: Bengt Ask
Location: Svalov, Sweden
Date: April 6, 1997 20:14, 21:14 UT

These images were obtained on April 6, 1997 using Fuji Super G 800 Plus film. The site is located about 5 km from Svalov in southern Sweden (latitude 55d54' North).

The first picture was taken at 20.14 UT with a 135 mm lens stopped down to f/4. Exposure time 8 minutes.

The second one was taken at 21.14 UT with a 400 mm lens used wide open at f/5,6. Exposure time 6 minutes.

On April 7, 1997, the second picture above (ask6a.jpg) was selected by NASA as the main illustration of the Comet Hale-Bopp Home Page maintained by the Jet Propulsion Laboratory.


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Copyright (C) 1997 Bengt Ask

Bengt Ask
bengt@df.lth.se

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