more than one way to watch 8P!
hot off the press - see what i mean about cutting it fine with announcements lol
good for the northerners
yet again *sigh* i guess it means their the ones to get hit first
'URSIDS 2007
We expect a significant shower on December 22, with a peak
around 20 - 22.2 UT and a full-width at half peak intensity of
about 2 - 8.5 hours (most likely around 5 hrs).
It would be great if this prediction could be confirmed. The
Moon is not favorable, but we hope that this does not discourage
visual, video, and photographic observers. The outburst is best
seen from Asia or Europe and by radio forward meteor scatter observations.
Below is the CBET announcement with some of the same information.
Peter Jenniskens
(pjenniskens@seti.org)
---
Electronic Telegram No. 1159
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL
http://www.cfa.harvard.edu/iau/cbat.html
'URSID METEORS 2007
P. Jenniskens, SETI Institute, writes that he and his colleagues E.
Lyytinen, M. Nissinen, I. Yrjola, and J. Vaubaillon (Jennniskens et al.
2007, JIMO 35, Dec. issue, in press) predict an outburst of Ursid meteors
associated with the imminent return of comet 8P/Tuttle to perihelion. The
peak of the outburst is predicted at 20-22.2 hr UT on Dec. 22 (most likely
21h.4-22h.2), when the shower rate (ZHR) will be about 40-80 meteors/hr, or
4-8 times the normal Ursid activity. The outburst may last as short as FWHM
= 2 hr if dominated by dust trails that were ejected during AD 700-900, or
as long as FWHM = 8.5 hr if older dust trails are involved. Meteors should
radiate from a geocentric radiant of R.A. = 218.3 deg, Decl. = +75.5 deg
(equinox 2000.0), with velocities of V_g = 33.52 km/s. These results were
derived by calculating the orbital evolution of meteoroids ejected by
comet 8P in the period AD 300-1400; it was found that encounters with
Jupiter at the ascending node of the comet orbit shortly after ejection
move the meteoroids in mean-motion resonances that evolve the dust into
earth-crossing orbits, creating a stream or filament that is elongated
perpendicular to the earth's path.
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2007 CBAT
2007 December 10 (CBET 1159) Daniel W. E. Green'
. Oh well maybe someone with a huge scope will get some beneift from this post.
. Thanks again for your help Lee. Incidentally I found this out by accident. After updating the details of one of them I tracked it forward to see how long it would be visable for and noticed it crossed paths with the other one. Was very exciting, until I found out they would be too faint. Maybe they will flair up to naked eye like 17p/holmes. we can only hope .
