(meteorobs) Possible outburst of beta-Perseids
tom6740
tom6740 at yahoo.com.cn
Mon Jul 31 10:25:52 EDT 2006
Dear all,
Would anybody tell me the differences between Perseids and beta-
Perseids? I look for beta-Perseids in Kronk's site but cannot find
it.
Regards,
Quanzhi
--- In meteorobs at yahoogroups.com, pmartsching at ... wrote:
>
> On 9/10 August 1988 I saw an unusual number of Perseids during one
hour.
> CDST 9/10 Aug 1988 2:00 - 3:00am = UT 10 Aug 1988 7:00 - 8:00
> During this hour I saw 34 Perseids. At that time I seldom made
magnitude
> estimates of meteors. My note says: "Many were fairly faint and
within 10
> degrees of the main radiant. Most had trains."
>
> My meteor counts that night:
>
> UT PER UPE KCG Spor L.M.
> 03:00-04:00 7 1 1 11 6.1
> 04:00-05:00 2 3 3 5 6.25
> 05:00-06:00 17 5 0 5 6.3
> 06:00-07:00 16 2 0 9 6.3
> 07:00-08:00 34 2 0 20* 6.25
> 08:00-08:30 11 2 0 5 6.15 0.5 hour
>
> *My note about the 20 Sporadics 07:00-08:00: "Most were 4th & 5th
magn. medium
> speed, no trains & in Cassiopeia. path length generally 1 - 4
degrees."
>
> The UPE's (Upsilon Pegasids) were still active then. They seem to
have vanished
> completely in the past few years.
>
> I was facing Andromeda and the Double Cluster. Observing at my
usual place: 93
> deg 34 min W; 42 deg 05 min N; 4 miles NE of Ames, Story County,
Iowa.
>
> Paul Martsching
>
>
> > Possible outburst of beta-Perseids
> >
> > Date: August 08, around 02:50 UT.
> >
> > In 1935, a large number of faint meteors were seen
> > visually by S. Holm in Denmark. The meteors had
> > short tracks and where mostly of +5 and +6 magnitude,
> > with only 6-8 meteors brighter than +4 in each 5-minute
> > count. Observing conditions must have been excellent
> > and the magnitude distribution index steep. Raw counts
> > by Holm peak at an amazing 548 meteors in a 5-minute
> > interval centered at 23h15m MET. An observer 35 km
> > from Silkeborg (at Brabrand, near Aaarhus) noted a
> > large intensity of weak meteors at 23h MET, but not
> > at all as many as reported by Holm.
> >
> > The dust trail responsible for this event, if it is real,
> > would be very near Earth's path again on August 8,
> > 2006. Meteors would radiate from R.A. = 52? Decl. = +40?
> > Peak time would be around 02:50 UT. This event
> > could be visible from western Europe and the eastern USA.
> >
> > If you are able to observe in the night of August 7/8,
> > please look for faint meteors (binoculars?). The Moon
> > should be out of the way in the final hour of the night.
> >
> > I would appreciate any reports on the level of activity,
> > in 5-minute intervals, even if no beta-Perseids are seen.
> >
> > Peter Jenniskens
> >
> > The SETI Institute
> >
> > pjenniskens at ...
> > ---
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