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    On Cas A, Cassini, comets, and King Charles

    193264_97460_PAS_PAS30_S1323358013000039a_1_-Soria.pdf (1.753Mb)
    Access Status
    Open access
    Authors
    Soria, Roberto
    Balestrieri, R.
    Ohtsuka, Y.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Soria, Roberto and Balestrieri, Riccardo and Ohtsuka, Yasuyo. 2013. On Cas A, Cassini, comets, and King Charles. Publications of the Astronomical Society of Australia. 30 (1): pp. e028.
    Source Title
    Publications of the Astronomical Society of Australia
    DOI
    10.1017/pas.2013.003
    ISSN
    1323-3580
    URI
    http://hdl.handle.net/20.500.11937/40091
    Collection
    • Curtin Research Publications
    Abstract

    We re-examine the long-standing problem of the date of the Cassiopeia A supernova (SN), in view of recent claims that it might be the 1630 ‘noon-star’ seen at the birth of King Charles II. We do not support this identification, based on the expected brightness of a Type-IIb SN (too faint to be seen in daylight), the extrapolated motion of the ejecta (inconsistent with a date earlier than 1650), the lack of any scientific follow-up observations, the lack of any mention of it in Asian archives. The origin of the 1630 noon-star event (if real) remains a mystery; there was a bright comet in 1630 June but no evidence to determine whether or not it was visible in daylight. Instead, we present French reports about a fourth-magnitude star discovered by Cassini in Cassiopeia in or shortly before 1671, which was not seen before or since. The brightness is consistent with what we expect for the Cas A SN; the date is consistent with the extrapolated motion of the ejecta. We argue that this source could be the long-sought SN.

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