(meteorobs) Draconid radiant position?

[Esko Lyytinen]

Hi all,

We here in Finland video meteor data have the geocentric radiant just 
where it is expected to be.
I think that the eplanation is at least in part, maybe totally, the 
zenith-attraction that you maybe have not taken into account. This can 
shift the radiant for several degrees, more or less correcting that "error".

Regards,
Esko

> Hi Sirko,
>
> I also observed this. I attached the HULUD1 tracing plot (all meteors).
>
> Regards,
>
> Erno Berko, Hungary
>
> ----- Original Message ----- From: <sirko at molau.de>
> To: "IMO-Network" <imo-network at yahoogroups.com>; "IMO-News Mailing 
> List" <imo-news at yahoogroups.com>
> Cc: "Meteorobs Mailing List" <meteorobs at meteorobs.org>
> Sent: Monday, October 10, 2011 10:01 PM
> Subject: (meteorobs) Draconid radiant position?
>
>
>> Folks,
>>
>> upon analysing my Draconid observations I found a significant shift
>> between the expected and observed radiant position. The expected
>> position (according to the IMO Meteor Shower Calendar 2011) is
>>
>> alpha = 262°, delta = 54°, v_inf = 20km/s
>>
>> However, the radiant I get from 200 Draconids, recorded by AVIS2 between
>> 18:15 and 21:15 UT, is
>>
>> alpha = 277°, delta = 54°, v_inf = 20 km/s
>>
>> That is, the deviation is exactly one hour in right ascension. Can that
>> be confirmed by other video observers?
>>
>> Best,
>> Sirko
>
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