(meteorobs) Re: 2012 Draconids

[Mikiya Sato]

Hello Mikhail Maslov, and all,

I am Mikiya Sato. Mikhail, I read your mail.
If I cannot understand all your mail, I am sorry.
In my understanding, the fM value is as showing in the following;

http://kaicho.pobox.ne.jp/tenshow/meteor/55p2004/fm.gif

(I am not good to explain by using English.
 So I am using this image, again. I am very sorry.)

And I am using the ratio of time that small section in a trail passes.

>Mikia, maybe you also considered differences in relative velocities
>between Leonids and Draconids. My fM is arond 15 times greater, than
>yours and it is similar to ratio Leonids relative velocity/Draconids
>relative velocity (note: I mean velocity in space, not of atmosphere
>entry).

As shown in my figure, my fM is about 1/n after n-revolution for 
all comets, in case of without perturbation.
Does its thing show the content of your mail?
(such as "considered differences in relative velocities between 
 Leonids and Draconids")
When my reply is not what you expect, I am sorry.

Best regards,

Mikiya Sato


>Hello,
>
>Some words about fM. It shows how much the trails are strethed
>alongside themselves, i.e., how many particles the trail contailns per
>unit of length. So the suggested activity is in direct proportion to
>fM value. It depends mostly on the difference between times of
>consequent nodal passages made by trail particles. Also some influence
>have changes in (rd-re) measure as well as in solar longitudes, but
>it is usually very small. To compute fM I use the same mechanism as
>for Leonids. In Leonids case my fMs are in good accordance with
>results of other researchers. But what happened in Draconids case?
>Mikia, maybe you also considered differences in relative velocities
>between Leonids and Draconids. My fM is arond 15 times greater, than
>yours and it is similar to ratio Leonids relative velocity/Draconids
>relative velocity (note: I mean velocity in space, not of atmosphere
>entry).
>
>Best regards, Mikhail Maslov