Leonids 2000 : Impressions and Results
Other DMS-members in the Netherlands and elsewhere

DMS-members observing the Leonids 2000


MS-Radio 15-20Ton Schoenmaker, Roden, the Netherlands
Visual 16/17Marc de Lignie, Stompwijk, the Netherlands
Visual 17/18Marc de Lignie, Leidschendam, the Netherlands
Visual 17/18Alex Scholten, Eerbeek, the Netherlands
Visual 16-18Philippus Lansbergen Observatory, Oostkapelle, the Netherlands
Visual 16/17Erwin van Ballegoij, Wela, Aruba, Dutch Caribbean
Visual 17/18Erwin van Ballegoij, Wela, Aruba, Dutch Caribbean
Visual 18/19Erwin van Ballegoij, Wela, Aruba, Dutch Caribbean
Visual 16-18Frans van Loo, Salobrena, Costa Tropical, Spain

Last updated: 30 november 2000




Leonids 2000 : Forward Scatter Meteor Observations
by Ton Schoenmaker, Roden, the Netherlands
DMS-members observing the Leonids 2000


Observer:    Ton Schoenmaker
Location:    Roden, Netherlands (06 26' E, 53 08' N)
Frequency:   55.275 MHz
Transmitter: Spanish TV channel E3 (video); transmitters in La Muela (30 kW),
             Gamoniteiro (50 kW) and Aitana (60 kW); all stations within 
             100 Hz of nominal frequency; distance ~1500 km             
Antenna:     3-elements horizontal Cushcraft 50 MHz Yagi tuned to 55.3 MHz;
             geographical azimuth 210 degrees (SW) 
Receiver:    Yupiteru MVT-9000 in USB mode; sensitivity 0.5 uV at 12 dB S/N
Observing:   800 Hz audio signal from earphone socket was rectified, digitised 
             and fed into a PC via the parallel computer port. HP VEE was used 
             to process the digitised signal and to store 15-minutes counts of
             reflections stronger than 0.22 uV (-120 dBm). Also for all 
             individual meteors date, time, duration (dead time) and maximum 
             signal are stored.

Due to many long duration reflections caused by fast and bright Leonids, it was not possible to just count the number of reflections. In the figures below the uncorrected hourly dead-time percentages are given instead.

Although the results may be influenced by individual long reflections, the following main peaks were found:

17 November 8h00m UTC +/- 0h30m peak dead-time of 50%

18 November 2h00m UTC +/- 0h15m peak dead-time of 70%
18 November 3h30m UTC +/- 0h15m peak dead-time of 80%
18 November 5h00m UTC +/- 0h15m peak dead-time of 80%
18 November 7h00m UTC +/- 0h15m peak dead-time of 90%

Ton Schoenmaker, Dutch Meteor Society and IMO
Meester Homanstraat 8, NL 9301 HP Roden, Netherlands
E-mail: schoenmaker@NFRA.nl
Call: PA0EFA

Uncorrected reflection percentages for 15-minute periods of Leonids. Full scale means signal stronger than -120 dBm during the whole period.


Details of uncorrected reflection percentages for 15-minute periods of Leonids on 17 and 18 November. Full scale means signal stronger than -120 dBm during the whole period.


Location: 
   Astronomical Observatory, Ghent University, Belgium
   (ED50 coordinates: 3 42' 32" E, 51 01' 25" N)
Antenna (2x): 
   4 elements horizontal Yagi, pointed East, elevation 20 deg
Antenna amplifier: 
   10 dB gain
   narrow band resonance lambda/4 antenna filter
Frequency: 
   (1)=66.29 MHz (signal) and (2)=65.3 MHz (interference control)
Receiver (2x): 
   modified commercial FM receiver
Data acquisition:
   12 bits PC-based A/D convertor, 250 Hz sampling rate
Interference rejection:
   dual setup: receiver (1) tuned at distant transmitter, receiver (2)
   tuned at empty frequency. Anti-coincidence measurement rejects
   registration of broadbanded spurious signals (lightning, computers,
   ignition motors, etc).
Further information:
   see WWW page (additional info + observational data)
   http://allserv.rug.ac.be/~hdejongh/astro/meteor/meteor.html
Data format:
   results are shown as total reflection time, expressed as
   a percentage. The actual number shows 10 times this value.
   When no figure is shown, the equipment was either out of service,
   or results could have been affected by interference, sporadic-E.



Leonids 2000 : Visual Results 16/17
by Marc de Lignie, Stompwijk, the Netherlands
DMS-members observing the Leonids 2000


Please find my visual counts of the night 16/17 November 2000.

Location: Stompwijk, The Netherlands (NB 52 07', EL 4 30')

Period       Mean    Teff    F       Lm    Leo  Spo
3:15-3:37    3:26    0.33    1.00    5.4    2    2
4:20-4:43    4:32    0.38    1.00    5.4    5    1
5:18-5:47    5:34    0.43    1.00    5.4    5    2

Cloud percentages were put in Teff, defining F=1.00.

Magnitude distributions:

Leo 1 (-10), 2 (0), 3 (1), 2(2), 2 (3), 2(4)
Spo 2 (2), 2 (3), 1(4)


Marc de Lignie               Tel. +31 (70) 320 5673
Prins Hendrikplein 42        Fax. +31 (70) 332 6477
NL-2264 SN  Leidschendam     E-mail: m.c.delignie@wxs.nl
The Netherlands              http://home.wxs.nl/~m.c.delignie/personalia/



Leonids 2000 : Visual Results 17/18
by Marc de Lignie, Leidschendam, the Netherlands
DMS-members observing the Leonids 2000


Please find my visual counts of the night 17/18 November 2000.

Observations were made with lots of obstruction of clouds and surrounding buildings, so this may be a reason for the lack of bright Leonids (apart from it being a real effect).

Location: Leidschendam, The Netherlands (NB 52 07', EL 4 30')

Period       Mean    Teff    F      Lm    Leo  Spo
3:39-3:46    3:43    0.12    0.7    5.5    7    0
4:03-4:12    4:08    0.15    0.5    5.5    2    1
4:12-4:21    4:17    0.15    0.7    5.5    6    0
4:21-4:36    4:29    0.25    0.9    5.5    5    0
4:42-4:51    4:47    0.15    0.8    5.5    6    0
4:51-5:01    4:56    0.17    0.8    5.5    4    1
5:03-5:14    5:09    0.18    0.8    5.5    6    0
5:14-5:21    5:18    0.12    0.9    5.5    6    0
5:21-5:24    5:22    0.05    0.7    5.5    3    0
5:29-5:36    5:33    0.12    0.8    5.5    7    1

Teff is *not* corrected for cloud coverage (1-F).

Leonid magnitude distributions:

3:39-3:46    0(0), 1(0), 2(2), 3(4), 4(1)
4:03-4:12    0(0), 1(1), 2(0), 3(1), 4(0)
4:12-4:21   -5(1), -2(1), 0(0), 1(1), 2(0), 3(2), 4(1)
4:21-4:36    0(0), 1(1), 2(2), 3(1), 4(1)
4:42-4:51    0(0), 1(1), 2(2), 3(1), 4(2)
4:51-5:01    0(0), 1(0), 2(2), 3(1), 4(1)
5:03-5:14    0(0), 1(0), 2(1), 3(2), 4(3)
5:14-5:21    0(0), 1(0), 2(2), 3(2), 4(2)
5:21-5:24    0(0), 1(1), 2(0), 3(2), 4(0)
5:29-5:36    0(0), 1(0), 2(1), 3(3), 4(3)
 
Spo          0(1), 1(0), 2(0), 3(1), 4(1)


Marc de Lignie              Tel. +31 (70) 320 5673
Prins Hendrikplein 42       Fax. +31 (70) 332 6477
NL-2264 SN  Leidschendam    E-mail: m.c.delignie@wxs.nl
The Netherlands             http://home.wxs.nl/~m.c.delignie/personalia/



Leonids 2000 : Visual Results 16/17/18
by Alex Scholten, Eerbeek, the Netherlands
DMS-members observing the Leonids 2000


Last night I tried to observe the Leonids. Unfortunately most of the night I was clouded out (with some rain). Only from 2h till 4h30m UT some small clearings appeared in the sky.
From 3h50m till 4h20m I could do some usefull observations with a limiting magnitude of around 5,0.
During this period 36 Leonids (and 3 sporadics) were observed. The preliminary results are presented in attached Excel-file. The calculated ZHR was 439 73.

Observer: Alex Scholten (ASE)					
          Horsterdijk 6a , 6961 KP EERBEEK , (0313) 651864					
Location: 01h35m - 03h07m UT : Voorthuizen (Brugveenseweg)					( 52,2 NB / 05,6 OL)
          03h35m - 03h50m UT : Oosterhuizen (Veendijk)					( 52,2 NB / 06,0 OL)
Date:     16/17 november 2000

Period (UT)    Teff Lm   Spo Leo   N Direction Remarks
01.35 - 01.40   5   5,0       1    1   W/NW    +3 at edge of fov
01.40 - 01.45   5   5,0            0   W/NW
01.45 - 01.50   5   5,0            0   W/NW
01.50 - 01.55   5   5,0   1        1   W/NW    +4
01.55 - 02.00   5   5,0       2    2   W/NW    +1 , +2 (pers. train)
02.05 - 02.10   2   5,0       1    1   W/NW    -1 (pers. train)
02.07 - 02.18   break
02.15 - 02.20   2   4,8       1    1   N       -1 (pers. train)
02.20 - 02.25   5   4,8            0   N
02.25 - 02.30   5   4,8            0   N
02.30 - 02.35   5   4,8            0   N
02.35 - 02.40   5   5,0            0   N
02.40 - 02.45   5   5,0            0   N
02.45 - 02.50   5   5,0            0   N
02.50 - 02.55   5   5,0            0   N
02.55 - 03.00   5   5,0            0   N
03.00 - 03.05   5   5,0            0   N
03.05 - 03.10   2   5,0            0   N
03.07 - 03.35   break
03.35 - 03.40   5   5,0   1        1   N        +2
03.40 - 03.45   5   5,0            0   N
03.45 - 03.50   5   5,0            0   N
03.50 - 03.55   5   5,0            0   N
stop at 03.55
total 2,75 UT  96   5,0   2   5    7

Stream    -1    0    1    2    3    4    N    N~    %~
Leonids    2    0    1    1    1    0    5    2    40%
Sporadics                 1    0    1    2    0     0%

Alex Scholten
Dutch Meteor Society,
Netherlands

Alex Scholten
Horsterdijk 6a
NL-6961 KP EERBEEK
tel.: (0313) 651864
e-mail: ascholten@wxs.nl

P.s: during the night 16/17 november I could preform some observations during 1,5 hour from 1h35m till 3h07m and 3h35m till 3h50m UT, with a limiting magnitude of around 5,0.
During these periode I could see only 5 Leonids (and 2 sporadics). Therefore I can conclude that the Leonid-activity was much higher during the night 17/18 november than during the previous night.



Leonids 2000 : Visual Results 16/17/18
by Public Observatory "Philippus Lansbergen", Oostkapelle, The Netherlands
DMS-members observing the Leonids 2000


Members of our Observatory observed the return of the Leonids from Oostkapelle. The first night, 16/17 november, was a bit disappointing. We had a great deal of fine clear weather, but we only counted 15 meteors: 1 Taurid en 14 Leonids. (and that from 11.45 till 06.00 (UT))

The second night started awfull: many clouds and too much rain. At about 02.00 we arrived at our location in Oostkapelle. The weather was still very bad, but we were hoping the best of it.
Within half an hour (02.32.00 - 03.02.00) we observed 17 Leonids between and through the clouds. That's even more than the whole of the night before! At 03.11.00 a very bright Leonid, with a long persistent trail, flew through the sky, right in the Zenith. We knew something was happening up there, but we couldn't witness it! (What a shame)

From 04.30 the sky became a bit brighter, but our Lm at around 3 - 4 makes clear that the circumstances were still not very good. However, we were very glad that we could see something after all. Between 04.30 and 06.00 we counted 132 Leonids!

In total we observed 183 Leonids during the 17/18 nov. night. Because of the many clouds, our observations will probably be of no use, but for most of us it was a night hard to forget.

Leonid, november 17, 04:47 UT, south of Cassiopeia
Public Observatory "Philippus Lansbergen", Oostkapelle, the Netherlands


Leonid, long lasting train(!!), november 18, 03:11:00 UT, Zenith
Public Observatory "Philippus Lansbergen", Oostkapelle, the Netherlands


Rijk-Jan Koppejan
"Philippus Lansbergen" Public Observatory,
Herengracht 52, 4331 PX Middelburg
Website: http://www.lansbergen.demon.nl
E-mail: philippus@lansbergen.demon.nl
E-mail: rijk-jan@free.zeelandnet.nl



Leonids 2000 : Visual Results 16/17
by Erwin van Ballegoij, Wela, Aruba, Dutch Caribbean
DMS-members observing the Leonids 2000


Hi All,

For the first time in six months a note from the Carribean. But when you are at the perfect location to observe the possible activity of the 2-rev trail at 7h53 UT (Nov 17) and the 4-rev at 7h51 UT (Nov 18), I ain't gonna miss it!
I've tried to start this year's Leonid observations at the 16th. But this night was clouded. Of course, it did start to get clear at dawn. That's Murphy for you.

Last night I had more succes. At the beginning of the night it looked very promissing, but later that night some clouds drifted in. Observations were three times interupted by clouds and even rain, of course also from 7h40 untill 7h53 UT. That's Murphy again, to have rain at the predicted time of possible maximum activity of the 2-rev trail at 7h53 UT.

I started my observations at 6h00 UT. The moon wasn't that much of a nuisance, because I looked in the northwestern direction. The limiting magnitude hovered all night around 6.0. The clouds were a nuisance, as you can see at the tabulated values of F.

In the beginning the Leonid activity was very low, and it remained low for over an hour. Then I had to interupt my observations for the first time because of rain. After I resumed my observations at 7h25 UT, the activity of the Leonids had increased considerably. As the predicted time of possible maximum activity of the 2-rev trail was approaching, I was hoping the activity would steeply increase to a minor storm level. This didn't happen. After 8h00 UT the activity stayed high, but slowly I grew tired. I had the impression the activity dropped again after 8h45 UT. I am not sure, because I started falling asleep. That's why I omited the unreliable observations which I made after 8h45 UT in this report. Noteworthy was the lack of real bright Leonids. Not one of the Leonids I observed could even reach the brightness of Jupiter. The two Taurids were beautiful, as always. They were majestically soaring through the sky with a bright head and a faint tail.

Now I will start the preparations for another observation run. Coming night I hope to see some activity of the 4-rev trail. I keep my fingers crossed.

Cheers

Erwin


Name: Erwin van Ballegoij (IMO-code: VANER)
Date: November 17 2000
Site: Wela, Aruba, Dutch Caribbean, 69d 58' W, 12d 29' N
Viewing direction: northwest
Viewing height: 70d

period (UT)    Teff     Lm      F     LEO  NTA  STA  MON  SPO total

06h00-06h15    0.20    5.94    1.11    2    0    1    0    1    4
06h15-06h30    0.23    5.86    1.25    0    0    0    1    0    1
06h30-06h45    0.25    5.86    1.14    2    0    0    0    0    2
06h45-07h00    0.22    5.86    1.25    1    0    0    0    1    2
07h00-07h15    0.18    6.01    1.43    3    0    0    0    1    4
07h15-07h30    0.08    6.09    1.00    1    0    0    0    0    1
07h30-07h45    0.13    6.04    1.00    5    1    0    0    1    7
07h45-08h00    0.12    5.93    1.23    4    0    0    0    0    4
08h00-08h15    0.22    5.76    1.21    5    0    0    1    2    8
08h15-08h30    0.18    5.75    1.00    7    0    0    0    0    7
08h30-08h45    0.17    5.81    1.52    7    0    0    0    0    7

                               total  37    1    1    2    6   47

Magnitude Distribution

       0    1    2    3    4    5    6    m (average)

LEO    3    5    7   13    6    3    0    2.62
NTA    0    0    0    1    0    0    0    3.00
STA    0    0    1    0    0    0    0    2.00
MON    0    0    0    1    1    0    0    3.50
SPO    0    0    0    2    0    4    0    4.33

Erwin van Ballegoij
Tarabanaweg 9
Oranjestad - Aruba
tel: 00 297 821918
e-mail: ballegoy@setarnet.aw



Leonids 2000 : Visual Results 17/18
by Erwin van Ballegoij, Wela, Aruba, Dutch Caribbean
DMS-members observing the Leonids 2000


Hi all,

Here another report from the Carribean. It ain't easy to observe one night, go to work the next day and going to observe the next night again. I planned to go to bed early, rise at 00h30 local time (04h30 UT) and to start observing from 01h30 local time. Alas, my body decided otherwise. I didn't hear the alarmclock and I woke with a start at 02h45 local time. Swiftly I packed my gear in the car, looked at the sky for two minutes, saw no meteors and concluded the show hadn't started yet.

The scene had completely changed when I arrived at the Wela hill. When I was installing my equipment, I saw already 6 Leonids. So I started observing at once. At 3h20 local time (7h20 UT) I started observing. And the activity was on the rise! But maximal activity was a bit early. From 7h30 untill 7h35 I counted 15 Leonids. And the clouds were really bugging me at that time (see the F-value for that time). Was this the activity of the 4-rev. trail a bit earlier than expected, or was this another trail? Later the activity dropped, but there were still many Leonids to be seen. At first I saw mostly faint Leonids, later that night the average magnitude increased. At the end a lot of clouds moved in. I waited a while. Through small holes in the clouds I saw three other Leonids, but the clouds didn't disappear. Even worse, it started to rain. Then I quit, because it was only a quarter of an hour untill dawn at 6h local time (10h UT).

I have another go tonight. If I'm succesfull, you will see the results tomorrow.

Cheers,

Erwin


Name: Erwin van Ballegoij (IMO-code: VANER)
Date: November 18 2000
Site: Wela, Aruba, Dutch Caribbean, 69d 58' W, 12d 29' N
Viewing direction: southwest
Viewing height: 70d

period (UT)    Teff     Lm      F      LEO  NTA  STA  MON  SPO  total
07h20-07h25    0.083    5.91    1.00    6    0    0    1    0    7
07h25-07h30    0.083    5.91    1.67    8    0    0    0    0    8      
07h30-07h35    0.083    6.05    2.00   15    0    0    0    0   15
07h35-07h40    0.083    6.10    1.36    9    1    0    0    0   10
07h40-07h45    0.083    5.84    1.20   11    0    0    0    1   12
07h45-07h50    0.083    5.84    1.30    7    0    0    0    0    7
07h50-07h55    0.083    5.84    2.00    8    0    0    0    0    8
07h55-08h00    0.083    5.85    1.67    4    0    0    0    0    4
08h00-08h05    0.083    5.95    1.00   10    1    0    0    1   12
08h05-08h10    0.083    6.10    1.00    8    0    0    0    0    8
08h10-08h15    0.083    6.10    1.07    7    0    0    0    1    8
08h15-08h20    0.083    6.10    1.50    6    0    0    0    1    7
08h20-08h25    0.083    5.94    1.25    6    0    0    0    2    8
08h25-08h30    0.083    5.84    1.00    4    0    0    0    0    4
08h30-08h35    0.083    5.84    1.00    3    0    0    1    2    6
08h35-08h40    0.083    5.84    1.03    3    0    0    0    1    4
08h40-08h45    0.083    5.84    1.20    6    0    0    0    0    6
08h45-08h50    0.083    5.84    1.20    4    0    0    0    0    4
08h50-08h55    0.083    5.84    1.20    2    0    0    0    0    2
08h55-09h00    0.083    5.82    1.20    7    0    0    0    0    7
09h00-09h05    0.083    5.73    1.20    5    0    0    0    3    8
09h05-09h09    0.067    5.73    1.30    3    0    0    0    0    3

                                total 142    2    0    2   12  158

Magnitude Distribution

      -3   -2   -1    0    1    2    3    4    5    6    m (average)
LEO    1    5    8   18   17   37   33   18    5    0    1.87
NTA    0    0    0    0    1    1    0    0    0    0    1.50
MON    0    0    0    0    0    0    0    1    1    0    4.50
SPO    0    0    0    0    0    1    4    4    3    0    3.75


Erwin van Ballegoij
Tarabanaweg 9
Oranjestad - Aruba
tel: 00 297 821918
e-mail: ballegoy@setarnet.aw



Leonids 2000 : Visual Results 18/19
by Erwin van Ballegoij, Wela, Aruba, Dutch Caribbean
DMS-members observing the Leonids 2000


Hi all,

This time no problems to wake up on time. I heard the alarmclock at 3 o'clock local time and I went to the Wela hill. The sky was great, considering the presence of the moon. The activity of the Leonids was low. Unfortunately, clouds drifted in after just 20 minutes, followed by a short and heavy rainstorm. After the rainstorm I waited for an hour. As the clouds were moving slowly and there was no indication the clouds were going to disappear, I decided to quit one hour before sunrise. So only a minor report from me today.

Cheers,

Erwin


Name: Erwin van Ballegoij (IMO-code: VANER)
Date: November 19 2000
Site: Wela, Aruba, Dutch Caribbean, 69d 58' W, 12d 29' N
Viewing direction: southwest
Viewing height: 70d

period (UT)    Teff    Lm     F     LEO  NTA  STA  MON  SPO  total
07h40-08h01    0.35    6.29   1.04   3    0    0    1    2    6

Magnitude Distribution

      -3   -2   -1    0    1    2    3    4    5    6    m (average)
LEO    0    0    0    0    0    1    0    2    0    0    3.33
MON    0    0    0    0    0    0    0    0    0    1    6.00
SPO    0    0    0    0    0    0    0    1    1    0    4.50


Erwin van Ballegoij
Tarabanaweg 9
Oranjestad - Aruba
tel: 00 297 821918
e-mail: ballegoy@setarnet.aw



Leonids 2000 : Visual Results 16/17/18
by Frans van Loo, Salobrena, Costa Tropical, Spain
DMS-members observing the Leonids 2000


To have more chance to become good weather. I intended to move to the south of Spain to observe the Leonid meteor shower. Big Low pressure systems hit Europe at the entire period. Some frontal systems hit south of Spain at several days. Strong winds at night blow many clouds" to heaven". But the night of 16/17 November, a rain zone cross the observation site and cancel out observations from 3h30m U.T. until daylight . The night of 17/18 nov. was almost clear but filed with strong winds , sometimes up to 100 km/h!
The action takes place under the code name "winds of the ghosts" after the fact that local habitans believe those strong winds comes from ghosts, unannounced! The observations takes place at Salobrena Spain, "Costa Tropical".
Position is approximately: -350' +3645'
Point of view NWN .Alt.= 5-40 .zone W-NE.
Height above sea level: 60 m.

16 nov.
Very bright sky.
6 stars in nr 6 Per.( VVS-kaarten)
	
Obs:	04h14m-04h45m
	
Leonids		Others

None			1
__
	
16/17 nov.
Clouds 20%.  Very bright sky.
6 stars in nr 6- Per.
_____
		
Obs.   16 nov.

23h30m-24h00m U.T.

Leonids       Others

4(?)		1			(?)	( not sure of all of them)
		
17 nov.00h00m-00h55m   U.T.

Leon.		Oth.

4 3

In respect to low activity and strong wind, observations were interrupted until 2h45m. Only one Leonid was seen at 03h00m. At 3h30m clouds covered the sky and end of observations
____

17/18 nov.
Clouds 5%. Very bright sky.
7 stars in 6-Per.

Time			Leon.		Oth.		sky

00h58m-01h30m	18		2		5%	clouds
01h30m-02h00m	19		2		open
02h15m-02h40m	34		2		open
02h45m-03h05m	34		3		open
03h10m-03h25m	30		1		open
03h30m-04h00m	36		1		open	
05h20m-05h40m	32		2		open
06h00m-06h40m	25		1		open

Tot.			228		14		

Magnitude dist. Leonids.17/18.nov.

Magn.	0	1	2	2.5	3	3.5	4	5	Tot.

N	5	16	71	(7)	97	(2)	30	-	228

General remarks.

Leonids  came in several times with 2 or 4 together!	
In one occasion 4 came in Uma. within one second. I strongly felt the impact bodys are in many cases break up before entering the atmosphere.
In a few occasions I saw trails longer than 20sec. Moonlight disturb the observation of trails.
____
	
19 nov.
20% clouds .Clear sky
9 stars in nr 6 Per.

03h00m-03h30m
	
Leonids		Others

5 5

Magnitudes observed Leonids: 4 3 3 2 2.

The activity of Leonids in the night of 18/19 November seems fair. 


F.R. van Loo
G.Lambertlaan 52
B3600 Genk
Belgium.
fransvanlo@be.packardbell.org
Phone: +32-89-841130





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