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(meteorobs) obs. LANMA 19-20 Oct 1999 (Ori)
Hi again!
The Orionids made a great performance last night, especially the last
observational hour was pretty cool! Below is a table with my data. I
observed a mere 2 hours (1.69 effective) from moonset till dawn, and
noted 66 meteors of which 31 were Orionids. During the last hour rates
were a little bit on the high side (my data for this hour give a ZHR of
38+-9, but I think it is a statistical 'hickup' only due to the
appearance of a bunch of Ori's near 3:55 UT; 5 in just 5 minutes! My
overall ZHR for this night comes at 28.5+-5, again slightly on the high
side but that is due to that last hour. The first hour has a calculated
ZHR that is normal, 18+-5). All meteors were plotted on gnomonic maps.
Sky conditions were good although not as excellent as previous nights;
there was a slight touch of haze, and some moving streaks of cirrus
during the first 40 minutes. During the last 40 minutes, some early KLM
birds made themselves a nuisance.
Most marvelous meteor of this night was a yellow -1 Orionid (4:09) with 1
sec persistent train that appeared as a semi-point meteor very close to the
radiant! A fast yellowish -1 sporadic appeared near to Capella at 3:25
and had a short 'wake'. I had a bunch of nice +1 and +2 Orionids as well,
some with trains. Sorry Marc, but I continue to see epsilon Geminids; 5
this night. Taurid activity is very dull, although I had a nice yellow +2
at 3:03.
Well, this was a very good night indeed! I am not sure if I am able to
observe coming night, since I have to give a talk to some amateur
archaeologists about flintworking tonight, and weather prospects predict
clouds coming in later this day. I skipped last monday night too, since I
had a social event which included emptying a bottle of fine Californian
wine, which ruins your observations (no, you don't start to see double
meteors; in 1993 at the Cagny excavation in France I determined
empirically, my dear friends, that 3 glasses of wine make your brightness
estimates tip off scale; my sporadics that night had a mean magnitude of
+1.8, oops!).
Table with my data from last night is below.
Cheers!
- Marco Langbroek
(Dutch Meteor Society)
Date: 19-20 October 1999
Obs.: Marco Langbroek LANMA
Loc.: Voorschoten, the Netherlands, 52d 07'N, 4d 28'E
UT
2:35-3:40 0.92 6.2 12 1 1 1 15 30 18+-5
3:40-4:40 0.77 6.1 19 2 4 2 9 36 38+-9
TOTAL 1.69 6.2 31 3 5 3 24 66 28+-5
strm/mag. -1 0 +1 +2 +3 +4 +5 <m>
Sporadics 1 0 0 4 10 4 5 3.25
Orionids 1 0 3 5 9 9 4 3.10
Taurids 0 0 0 1 0 2 0 3.33
e Geminids 0 0 0 1 3 1 0 3.00
Leo minorids 0 0 0 0 1 2 0 3.67
>>>>>>
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