(meteorobs) Draconids questions

[Mikhail Maslov]

Hello, Bruce and all,

Yes, that is a coincidence, the same time on different dates.
As I understand, the date of 9 October given by Bob is date of
"traditional" maximum, corresponding the time when the Earth passes
closest to the node of 21P orbit. It is the most likely time of
background activity if it occurs (principally only in 21P
perihelion years).
On other hand, speaking of 7 October peaks, they are connected to
trail encounters and have no relation to the current orbit of the
parent comet.

Best regards, Mikhail


BM> Mikhail wrote:

>> On 7 October two meteor showers can give some activity enhancements.
BM> The first is Draconid shower, computations show that during 7 Octover it
BM> may produce a very weak activity with ZHR perhaps not higher than
BM> several meteors with low average brightness. Computed moments of two
BM> peaks are 4:40 UT ...

BM> ... and Bob wrote:

>> The Draconids (GIA) are predicted to peak on October 9 near 0430 Universal
BM> Time. This corresponds to the evening hours of October 8 for those located
BM> in the American longitudes. ... The radiant is best placed just as it becomes dark during the
BM> evening hours. 

BM>     Just wanting to confirm that we are dealing with two separate dates here, an "activity enhancement" on the 7th and a traditional peak on the 9th, and that by coincidence both occur at the
BM> same time of day. That translates to ~2130 MDT, which nicely meets Bob's criterion above. 

BM>    The Draconid shower is one that has completely eluded me to this point, so I'd love to take a crack at it. In a perfect world I'd try on both of these dates, but that might not be possible.
BM> Any thoughts as to which evening might be "better"? Or more scientifically significant?

BM>     Thanks.

BM>     Bruce
BM>     *****

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