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Optical studies of Cassiopeia A. VI - Observations during the period 1976-1980
van den Bergh, S.; Kamper, K. W.
AA(Dominion Astrophysical Observatory, Victoria, British Columbia, Canada), AB(David Dunlap Observatory, Richmond Hill, Ontario, Canada)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 268, May 1, 1983, p. 129-133. (ApJ Homepage)
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NASA/STI Keywords:
Cassiopeia A, Supernova Remnants, Photographic Plates, Stellar Motions, Visible Spectrum
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Previously published observations of the fast moving knots in Cas A obtained between 1951 and 1975 have been supplemented by eight new Hale 5 m prime focus plates taken in 1976, 1977, and 1980. Combining new observations of 46 long-lived knots with previously published data yields an explosion date T0 = 1658 + for - 3. No significant deceleration was detected in 36 knots that have been observed for at least 20 years. New proper motions are also given for three quasi-stationary flocculi. Attention is drawn to a cluster of exceedingly faint flocculi located outside the Cas A radio shell. One of these objects became visible almost simultaneously at optical land at radio wavelengths.

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