[vsnet-chat 7729] Re: Question about re-finding of MIRA by Fabricius

[Knud Strandbaek]

Dear Seiichiro Kiyota and Members,

Interesting!
I think it also may be of interest to find other documentations from later
observations if there may be found any changes in the period just after
Fabricius.

Please have a look here:
http://en.wikipedia.org/wiki/Mira_variable
http://www.aavso.org/mira-variables-period-changes

Best regards
Knud Strandbaek
Stella Nova Observatory, Denmark
from Tyge Brahe's  (Tycho) Homeland


2011/9/20 Seiichiro Kiyota <skiyota at nias.affrc.go.jp>

> Dear variable star observers,
>
>
> Recently, our friend Masayuki Moriyama posted a question about "re-finding
> of Mira by David Fabricius at Feb. 1609" to our maling-list of VSOLJ.
> Fabricius discovered Mira at 13th Aug, 1596. He observed it until Oct,
> 1596. Then, he found Mira again at Feb. 5th, 1609.
> This discovery story can be confirmed by letters to Tycho and Kepler from
> Fabricius.
> I read these letters that translated in English in "Change and Continuity
> in Early Modern Cosmology" (Patrick J. Boner ed., Springer 2011).
>
>
> Moriyama's question is:
> Brightness of Mira was reported about 2 magnitude near maxima at Aug. 1596.
> Period of Mira is 322 days.
> Thus, Mira Should be near minimum in Feb. 1969 when Fabricius noticed Mira
> again.
> When Fabricius re-found of mira, how bright Mira was?
>
>
> Any suggestions?
>
>
>                                                      Thank you,
>                                                       Seiichiro Kiyota
>                                                      VSOLJ
>



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