Abstract
EIGHTEEN plates obtained with the 200 inch (5 m) Hale telescope between 1951 and 1968 have been used to study the motions of the luminous filaments1 associated with the radio source Cas A. The centre of expansion which is found from these motions is given in Table 1. The smaller mean errors of the present determination of the centre of expansion are almost entirely due to the longer time-base which is now available for the determination of the proper motions of individual filaments. Assuming a uniform rate of expansion the explosion which gave rise to Cas A is found to have taken place in AD 1667 ± 8 (m.e.). The position of the adopted centre of expansion is shown in Fig. 1.
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VAN DEN BERGH, S., DODD, W. Search for an Optical Remnant of the Cassiopeia A Supernova. Nature 223, 814–815 (1969). https://doi.org/10.1038/223814a0
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DOI: https://doi.org/10.1038/223814a0
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