(meteorobs) Draconids: heliocentric radiant

[Chris Steyaert]

   Geert,


>This position is obtained by subtracting Earth's velocity from the 
>assumed geocentric radiant of the 1900 Draconids trail (RA 263.2, 
>DEC 55.8, V 20.5 km/s).

Normally you start from heliocentric radiant and add the velocity of 
the Earth to obtain the geocentric one ;-)

Did a quick check and found for the heliocentric radiant ecliptical 
coordinated lmb 280 deg, beta 32 deg, which confirms your values in 
RA and Decl.


         Success,

         Chris



At 04:22 06/10/2011, Geert Barentsen wrote:
>All,
>
>I believe the heliocentric radiant of the Draconids (i.e., the 
>direction along the stream in space), should be located near:
>
>RA 18:41
>DEC +08:15
>
>This position is obtained by subtracting Earth's velocity from the 
>assumed geocentric radiant of the 1900 Draconids trail (RA 263.2, 
>DEC 55.8, V 20.5 km/s).
>(Please do correct me if I made a mistake?)
>
>I believe this would be an interesting position for photographic or 
>telescopic observations to be made in the next few days, e.g. to 
>check if any fragments of the parent comet may be found (very 
>speculative!), or to search for the so-called "radiant glow" (cf. 
>Nakamura et al.: 
><http://adsabs.harvard.edu/abs/2000ApJ...540.1172N>http://adsabs.harvard.edu/abs/2000ApJ...540.1172N 
>).
>
>Best wishes,
>Geert
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.meteorobs.org/pipermail/meteorobs/attachments/20111007/c1045ff8/attachment.html