[AZ-Observing] Upcoming Leonid meteors
- From: Brian Skiff <bas@xxxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Tue, 31 Oct 2006 12:06:14 -0700 (MST)
A notice issued today from the Central Bureau says we should
expect a good, very short Leonid outburst. Relevant quotes:
LEONID METEORS 2006
P. Jenniskens, SETI Institute, reports that the earth will encounter the
two-revolution dust trail of comet 55P/Tempel-Tuttle around 2006 Nov.
19d04h50m UT, with a FWHM of 38 min (Jenniskens 2006, Meteor Showers and
their Parent Comets, Cambridge Univ. Press, p. 630). A 3-percent moon in
Virgo will not interfere. Meteors should radiate from a geocentric radiant
of R.A. = 154.32 deg, Decl. = +21.09 deg (equinox 2000.0), with velocities
of V_g = 70.80 km/s.
[these are really fast meteors...]
In a 1999 paper (JIMO 27, 85), R. McNaught and
D. Asher first found that the earth will pass this trail by 0.00009 AU at
2006 Nov. 19d04h45m UT (236.615 solar longitude) for observers in southern
Spain; the peak time will be 7 minutes earlier in eastern Brazil and 6
minutes later in Scandinavia. A recent update
[http://www.arm.ac.uk/leonid/dust2006.html] puts the peak rate at ZHR = 120
meteors/hr.
....
(C) Copyright 2006 CBAT
2006 October 31 (CBET 710) Daniel W. E. Green
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