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Outburst of early QUA

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登録日: 2004.08.07
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記事日時: Sat Dec 09, 2006 12:27 pm    記事の件名: Outburst of early QUA 引用付きで返信

Hi all
This is a brief of the Japanese topic of below.

Mr. Uehara noticed on 06/Dec/2006 that there was an concentration at Draconis.
He estimated the center of them as ra=202deg, dec=+64deg, Vg=40km/s
From 04/Dec to 06/Dec, there are 6 simultaneous observations in the data of SonotaCo Network that are close to this radiant.
Many of them are bright (..0mag).
I named this shower as "aDr" for the temporarily.
Mr Uehara also noticed that the orbit of "aDr" is similar to the following showers. They have almost same Vg,
Qua = Shower 83
Shower 73
Shower 78
(Shower xx : Sirko Molau IMC pdf

I adapted these radiants to my new radiant movement calculation method (implemented in UFORadiant Feb/2006).
It assumes that a radiant moves on one great circle by same angular velocity.
Though it uses same notation "dra" and "ddec", it treats them as a unit vector that shows the moving direction and the angular velocity at the peak coordinate of the shower.

As the result, I found that the 5 showers(Qua,aDr,Shower 73,Shower 78,Shower 83) meets very well on one circle that is defined by below.
peak: 4/Jan sol=284 ra=229 dec=51 dra=0.6deg/day ddec=-0.52deg/day Vg=40.6km/s

We are now thinking that the "aDr" was the early outburst of QUA(=Shower83), and the Shower 73,78 may be the same.
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