Course Work BY R. A. Chaproniere
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Assignment 6 (Craters)
Assignment 6 - Craters
1) Click the mouse button anywhere inside the image; this will cause the coordinates of the pixel on which the cross hair lies to be displayed at the left-hand side of the screen. Now move the cross hair to your best estimate of the "north pole" of Mimas. Then click the mouse button, and move the mouse so that the cross hair is on your best estimate of the "south pole" of Mimas. Determine the diameter of Mimas in pixels:
2) We know from measurements taken by Voyager that the actual diameter of Mimas is 390 km. Now we can find the scale of this image in km/pixel:
scale = (diam. in km)/(diam. in pixels) = km/pixel
3) Notice that the crater is not oriented north-south; find the widest part of the crater, and measure the diameter in the same manner as you measured the diameter of the whole moon.
4) Now multiply by the scale factor to find the diameter of Herschel crater in kilometres:
diam.(pix) x scale (km/pix) = diam. = km (See below)
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