(meteorobs) 6 April 2015

[Roberto Gorelli]

On Mon, 4 May 2015 19:21:18 +0000
  <szilard.csizmadia at dlr.de> wrote:
> Dear Roberto,
> 
> there was a very bright (-14 mag?) fireball over Hungary Apr 6, 2015 
>17:31 UT, just a few minutes after sunset. Many witnesses reported a 
>sonic boom 30-40 sec after the fireball. Only low precision webcam 
>pictures exist (the meteor cameras start a little bit later when Sun 
>reaches -6...-12 deg):
> 
> http://tuzgomb.blogspot.de/2015/04/nappali-tuzgomb.html
> 
> (Sorry, the text is in Hungarian, but the pictures and videos are 
>nice.)
> 
> My calculation - based on the coordinates estimated by Zoltán Zelkó 
>from these videos/pictures - reveals an orbit which might be similar 
>to 2015 HX176, but there is 13 deg deviation in inclination and more 
>than 60 deg in peri, and eccentricity also only 0.53 instead of 0.788 
>of 2015 HX176. But the estimated altitudes-azimuths are uncertain 
>enough to make the orbital calculation uncertain, but it seems it is 
>not easy to relate this meteor to the presently known elements of 
>HX176.
> 
> Can you tell me the radiant position of the suspected meteor shower? 
>Thanks.
> 
> Best wishes,
> Szilárd

Warrning, that data come from an orbit of only 4 days then not so 
reliable, future probable changes of orbital data shall be followed by 
changes in the radiant coordinates:

software DOSMETH

Method    D (MOID)    Date max

Q+         0.040          6.3 April
B+         0.039          6.3 April
P+         0.034          9.1 April

Geocentric speed

23.21 km/sec
23.29
23.73

radiant

asc.        decl.

355.4     50.0
355.6     49.9
356.7     49.2

radiant between Cassiopea and Lacerta

Best greetings.
Roberto Gorelli