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Assignment 6 (Craters)


Assignment 6 - Craters
Notes:
1) The distance data in the above table represents the required method for finding the diameter of the Herschel Crater. I have calculated it taking into account a flat 2D representation together with the spherical 3D version.
2) Being unhappy with the accuracy of the my findings I went on to derive the angular positions of H1 - H4 using the formula from the last assignment. Reducing the data to simple right angled triangles I calculated the hypotenuse of each, thus determining the angular distance between H1/H2 and H3/H4. From the given diameter of Mimas (390km) I calculated the circumference from which I was able to determine the actual distance of H1/H2 and H3/H4. Averaging them both out produced a figure I was more happy with.

5) What fraction of the diameter of Mimas is the diameter of Herschel crater?

6) Try to find the centre of Dione from the image. Get as accurate an estimate of the radius of Dione
in pixels as you can. One method to estimate the radius is to go to a 'zoom' of 200% and adjust the image so that you are viewing one 1/4 of the image.
radius in pixels

7) The actual radius of Dione is about 560 km. Now you can estimate the scale factor for this image
in the same way you did for the image of Mimas. scale factor = (radius in km)/(radius in pixels)

8) Scroll up the image as far as it will go. Look for the largest crater you can find, and estimate its
diameter in the same way you did for Herschel crater on Mimas.

9) Which crater is larger, this one on Dione, or
Herschel on Mimas?
A) Dione
Which crater is larger IN PROPORTION TO
THE BODY IT IS ON?
A) Herschel on Mimas (Data Below)

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