Several Images have been measured using Image Analyst software to determine the size of the umbral shadow and to investigate any change in umbral size during the eclipse.

From a complete set of images taken by Willian Souza a best fit and sixth order ploynomial curve in the Excel chart above gives a good fit to the data and indicates a change in the measured umbral size (Fi). This is due to the curvature of the Moon's surface and possibly, change in its size during this eclipse. The expected umbral semi-diameter (F2) was 0.679 degrees.

Measures of Willian Souza Images at 3h59m11s and 4h11m06s (UT)

These images were somewhat difficult to measure due to their small size and some minor changes in exposure,

but the result is good due to the large number of data points provided.

In this series of images by Fred Espenak, several were taken at longer exposure times which gave slightly reduced measurements of Fi the semi-diameter of the umbra. The best fit polynomial curve (black) shows a reduced umbral radius similar to Suza's result above. Two of the measured images are shown below:

Measures of Fred Espenak's Images at 2h03m and 4h11m (UT)

These images were easy to measure due to their clarity and size. Where some changes in exposure times were made these image measures gave reduced values of Fi, but the overall result was good due to the large number of data points provided by the 12 images.

Produced by the Theodore Lunar Observatory Australia 2004 November 24