(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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