(meteorobs) IMO Shower Circ.: 2006 Orionids

[Rainer Arlt]

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           I M O   S h o w e r   C i r c u l a r
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                   ORIONIDS 2006, VISUAL

The Orionids surprised with heightened activity in 2006. 
A considerable set of 146 observing priods was collected 
by 2006 October 25, 14h UT which leads o the below ZHR
profile. The maximum was not sharp; high rates were ob-
served throughout the European and most of the American 
night of Oct 21/22 with ZHR > 50. Large fractions of
bright Orionids were reported by the observers. A popu-
lation index of r=2.0 was assumed for that reason. Such
a value is typical for strong showers like the Perseids
or the Geminids. Sporadic meteors, for comparson, have
a population index of roughly 3 implying a larger frac-
tion of faint meteors. The Orionids used to have inter-
mediate population indices in previous years.

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Date (UT)   Time  Solarlong   nINT   nORI    ZHR
-------------------------------------------------------
Oct 20.008  00:12   206.374     13     90     22  +-  2
Oct 20.438  10:31   206.802      9    208     31  +-  2
Oct 21.291  06:59   207.650     18    496     47  +-  2
Oct 21.862  20:41   208.218     13    172     56  +-  4
Oct 22.041  00:59   208.396     12    284     52  +-  3
Oct 22.147  03:32   208.502     12    289     57  +-  3
Oct 22.257  06:10   208.611     11    235     53  +-  3
Oct 22.373  08:57   208.727     13    337     44  +-  2
Oct 22.941  22:35   209.292      8    104     42  +-  4
Oct 23.029  00:42   209.380     11    205     44  +-  3
Oct 23.317  07:36   209.666      7    244     36  +-  2
Oct 24.285  06:50   210.631     12    263     35  +-  2
Oct 25.112  02:41   211.455      7    105     27  +-  3
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Solar longitudes refer to eq. J2000.0. nINT is the number
of observing periods in each average, nORI is the number
of Orionids in each average.

We are grateful to the observers who sent in their data
swiftly after the observation was made:

Ricardas Balciunas (Lithuania)
Geert Barentsen (Belgium)
Ivana Cvijovic (Serbia)
Nadja Dankova (Bulgaria)
Gunther Fleerackers (Belgium)
George Gliba (USA)
William Godley (USA)
Wayne Hally (USA)
Carl Johannink (the Netherlands)
Javor Kac (Slovenia)
Petar Kostic (Serbia)
Richard Kramer (USA)
Jan Lemregts (Belgium)
Robert Lunsford (USA)
Sonja Manojlovic (Serbia)
Pierre Martin (Canada)
Paul Martsching (USA)
Koen Miskotte (the Netherlands)
Ian Musgrave (Australia)
Tamara Radakovic (Serbia)
Li Ren (China)
Jurgen Rendtel (Germany)
Branislav Savic (Serbia)
Nastassia Smeets (Belgium)
Wesley Stone (USA)
Rishikesh Tilak (India)
Marija Todorovic (Serbia)
Hendrik Vandenbruaene (Belgium)
Michel Vandeputte (Belgium)
Jovan Vasiljevic (Serbia)
Thomas Weiland (Austria)
Kim Youmans (USA)


Rainer Arlt, 2006 Oct 25, 15h30 UT


-- 
Rainer Arlt  --  Astrophysikalisches Institut Potsdam -- www.aip.de
rarlt at aip.de --  phone: +49-331-7499-354  --  fax: +49-331-7499-526