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(meteorobs) Fwd: Draconid's 1998 storm



>From astron@zgr.kts.ru  Sun Oct 11 05:47:49 1998
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>From: "Sergey E.Guryanov" <astron@zgr.kts.ru>
>To: <meteorobs@latrade.com>
>Subject: Draconid's 1998 storm.
>Date: Sun, 11 Oct 1998 09:39:25 +0700
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>Hello All!
>I'm Sergey Guryanov - amateur from Siberia, Russia (Zelenogorsk, Krasnoyarsk
>region).
>My location is about E94.5 N56.2 deg.
>According to my observations, the 1998 Maximum of Draconid's meteor shower
>was about 13h10m -13h15m UT at 8 october 1998 with more than 1000 meteors
>per hour inside this time interval! I started about 12h35m with drawing
>meteors to the chart in the region size about 60 degrees with center approx.
>RA19.0h DE+16.0 deg. directly from my flat.  Some urban light pollution and
>haze redused my limit to 3.7 - 4 mag (for stars). But soon I detected that
>the activity was great and I could not to draw all meteors! And I began only
>count them. At the first time interval 13h10m -13h30m there were 15 meteors
>brighter then 2.5m in the region with size about 1/5 from all sky
>(Her,Aql,Del,Lyr...): (<0m - 3; 0m - 2; 1m - 2; 2m - 5; 3m - 3). According
>to the another observer in our town, approx. the same activity was in
>UMa-Boo region. If we can assume that the really number for the 3-mag
>meteors was twice more than for 2mag - there were about 10 meteors with 3mag
>(but I couldn't to detect all of them) and so on - 20 meteors about 4mag and
>40 meteors about 5mag - totally about 80 meteors per 1/3 hour at the 1/5
>size of all sky. Multiply - we have about: 80 x 3 x 5 = 1200 meteors per
>hour! It is not precision, but the reality was about this. Another such
>counting give about 500 meteors/hour at 13h30m -14h15m and about 100 meteors
>per hour at 14h15m - 14h45m. At the next time interval (15h10m - 15h20m) I
>couldn't detect any meteor brighter than 3m and was finished my
>observations. The bright moon (88% illuminated) was from 3 up to 20 degrees
>above horizon from the beginning to the end of my observations. Limited
>stars magnitudes were changed from 3.7 up to 4.8 mag (unpredictable - hase).
>I phoned to the Moscow ("Zvezdochot" (Stargazer) russian magazine) and
>reported about the Draconid's activity at 13h30m UT directly after the
>maximum.
>And some more: one stationary(?) meteor showed the radiant near RA 17h20m,
>DE +54.8 deg. But some another seemed, that radiant was not a point, but the
>spot about 1 degree or more...  Possible "packs" of bright meteors in this
>shower.
>Regards, Sergey.