Leonids 1999: Observational Results!
The DMS Leonid Expedition 1999 in Portugal
Team "Almodôvar": Visual Observations
1. Olga van Mil, november 14/15
2. Olga van Mil, november 15/16
3. Olga van Mil, november 16/17
4. Olga van Mil, november 17/18
5. Alex Scholten, november 14/15
6. Alex Scholten, november 15/16
7. Alex Scholten, november 16/17
8. Alex Scholten, november 17/18
9. Alex Scholten, november 17/18 : ZHR-graph
10. Peter Bus, november 17/18
11. Peter Bus, november 17/18 : ZHR-graph
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(Last updated: 99-12-15)
Olga van Mil, november 14/15
OMV 14/15 november 1999
Remark: lots of disturbing citylights.
Interval Tm T.eff Lm leo tau spo tot
23:50-01:00 00,42 0,56 6.3 4 2 5 11
01:00-02:00 01,50 0,96 6.3 6 4 9 19
23:50-02:00 00,92 1,52 6,3 10 6 14 30
Stream 1 2 3 4 5 N N %
leo 2 3 2 3 0 10 4 40 2,6
tau 2 3 1 0 0 6 1 17 1,83
spo 1 1 6 4 2 14 0 0 3,36
Olga van Mil, november 15/16
OMV 15/16 november 1999
Interval Tm Teff Lm Leo Tau Spo Tot
23:22-00:30 00,93 0,70 6,4 0 5 12 17
00:30-01:30 01,00 0,70 6,4 3 5 7 15
01:30-02:30 02,00 0,95 6,4 6 4 8 18
02:30-04:05 03,29 1,35 6,5 10 6 14 30
23:22-04:05 01,73 3,63 6,4 19 20 41 80
Stream-1 0 1 2 3 4 5 N n %
Leo 0 1 1 5 5 5 2 19 1 5 2,9
Tau 1 1 1 3 9 5 0 20 1 5 2,7
Spo 0 1 0 8 14 13 5 41 1 2 3,3
Olga van Mil, november 16/17
Olga van Mil, november 17/18
Alex Scholten, november 14/15
ASE 14/15 november 1999
Remark: detoriated concentration
Interval Tm T.eff Lm Leo tau spo tot
23:32-00:30 00,02 0,45 6.3 0 1 1 2
00:30-01:30 01,00 1,00 6.3 0 1 12 13
01:30-02:30 02,00 0,82 6.4 1 1 10 12
02:30-03:30 03,00 1,00 6.3 0 0 6 6
03:30-04:07 03,81 0,52 6.3 1 0 3 4
23:32-04:07 01,83 3,80 6,3 2 3 32 37
stream -1 0 1 2 3 4 5 N N %
leo 0 0 0 0 2 0 0 2 0 0 3,00
tau 0 0 1 1 1 0 0 3 0 0 2,00
spo 1 1 4 6 8 8 4 32 2 6 2,84
Alex Scholten, november 15/16
ASE 15/16 november 1999
remark: after 3 UT detoriated concentration
because of fatique.
Interval Tm Teff Lm Leo Tau Spo Tot
32:24-00:30 00,00 0,90 6,3 0 6 3 9
00:30-01:30 01,00 0,80 6,3 2 1 5 8
01:30-02:30 02,00 0,97 6,3 1 5 8 14
02:30-03:30 03,00 0,83 6,3 1 4 4 9
03:30-04:45 04,10 1,20 6,3 5 3 12 20
23:24-04:45 02,10 4,70 6,3 9 19 32 60
Stream 0 1 2 3 4 5 N N %
Leo 1 2 2 1 3 0 9 4 44 2,33
Tau 1 1 5 3 8 1 19 0 0 3,00
Spo 1 3 2 8 11 7 32 1 3 3,44
Alex Scholten, november 16/17
ASE 16/17 november 1999 Portugal Almodovar
Periode (UT) Tm Teff Lm LEO TAU SPO N TOT
23.03 - 00.00 23,53 0,93 6,2 1 1 2
00.00 - 01.00 0,50 0,97 6,3 2 8 10
01.00 - 02.00 1,50 0,88 6,4 2 3 4 9
02.00 - 03.00 2,50 0,97 6,5 10 7 17
03.00 - 04.00 3,50 0,95 6,5 9 2 11 22
04.00 - 05.00 4,50 0,97 6,5 8 4 12
05.00 - 06.00 5,50 0,83 6,4 5 3 8
23.03 - 06.00 2,54 6,50 6,4 34 8 38 80
-1 0 1 2 3 4 5 N N~ %~
Leonids 3 2 4 5 6 9 5 34 16 47 2,62
Taurids 3 3 2 8 0 0 3,13
Sporadic 1 5 10 11 11 38 1 3 3,63
slightly cirrus from 4h UT
Alex Scholten, november 17/18
RESULTS LEONIDS PORTUGAL 17/18 NOVEMBER 1999 (ASE)
Date : 17/18 november 1999
Place : Almodôvar (Portugal), Capela do Santo Amaro
37° 31,2' N / 08° 04,7' W h ~ 330m
Observer : Alex Scholten (ASE), Netherlands (Dutch Meteor Society)
Horsterdijk 6a, 6961 KP EERBEEK, (0313)651864, ascholten@wxs.nl
Direction : south-east, 50°
Circumstances: clear sky; moon (66%+) till 01h27m UT
Observation : 23h20m UT - 06h00m UT
times
T effective : 6,3 h (379 minutes)
(all times in UT)
Radiant
Time-interval Tm T eff Lm Leonids N N N
(UT) (UT) min mean h° -2 -1 0 1 2 3 4 5 Leo N~ %~ m Tau Spo
23.20 - 00.15 23,79 50 6,2 2 1 1 2 0 0% 2,00 3 1
00.15 - 00.30 0,38 15 6,2 8 2 1 1 1 5 2 40% 1,40 1 1
00.30 - 00.45 0,63 15 6,2 11 1 2 1 1 5 4 80% 2,20
00.45 - 01.00 0,88 15 6,2 14 1 2 1 1 1 1 1 8 4 50% 1,70 1
01.00 - 01.15 1,13 ±14 6,2 17 2 2 3 3 4 3 2 19 12 63% 2,10 1 2
01.15 - 01.30 1,38 15 6,3 19 2 4 4 5 9 13 5 42 19 45% 2,76 1
01.30 - 01.45 1,63 15 6,4 22 4 3 9 25 19 15 75 53 71% 3,20 2
01.45 - 02.00 1,88 ±14 6,4 25 5 16 22 36 44 25 148 x - 3,17 1
02.00 - 02.05 2,04 5 6,4 27 from 02.00 till 02.40 no 73 x - -
02.05 - 02.10 2,13 5 6,4 28 magnitude estimates 97 x - - 1
02.10 - 02.15 2,21 5 6,4 29 from 01.45 till 03.30 no 66 x - - 2
02.15 - 02.20 2,29 5 6,4 30 indication of trails 94 x - - 1
02.20 - 02.25 2,38 5 6,4 31 80 x - - 1 2
02.25 - 02.30 2,46 5 6,4 32 70 x - - 1
02.30 - 02.35 2,54 5 6,4 33 34 x - - 1
02.35 - 02.40 2,63 5 6,4 34 29 x - - 2
02.40 - 02.45 2,71 ±4 6,4 35 2 4 3 3 2 5 19 x - 2,74
02.45 - 02.50 2,79 5 6,4 36 3 2 2 4 6 4 21 x - 2,95 1
02.50 - 02.55 2,88 5 6,4 37 1 3 6 8 7 25 x - 2,68 1
02.55 - 03.00 2,96 5 6,4 38 1 3 2 1 8 5 5 25 x - 2,84
03.00 - 03.05 3,04 5 6,4 39 2 3 3 4 8 4 24 x - 3,04
03.05 - 03.10 3,13 5 6,5 40 1 1 1 3 4 4 14 x - 3,40 1
03.10 - 03.15 3,21 0 pauze 41
03.15 - 03.20 3,29 5 6,5 42 2 2 2 3 5 3 17 x - 2,94 1
03.20 - 03.25 3,38 5 6,5 43 1 4 2 3 2 4 16 x - 2,81 1
03.25 - 03.30 3,46 5 6,5 44 1 1 1 2 4 2 11 x - 3,00
03.30 - 03.35 3,54 5 6,5 45 2 4 2 4 1 4 17 10 59% 2,59
03.35 - 03.40 3,63 5 6,5 46 1 1 3 5 4 1 15 12 80% 2,80 1 1
03.40 - 03.45 3,71 5 6,5 47 1 1 2 2 3 1 10 8 80% 1,60 1
03.45 - 03.50 3,79 5 6,5 48 1 1 2 1 3 8 2 25% 3,30 1 2
03.50 - 03.55 3,88 5 6,5 49 2 2 2 3 9 7 78% 2,22
03.55 - 04.00 3,96 5 6,5 50 1 1 1 1 2 1 7 5 71% 2,71
04.00 - 04.05 4,04 5 6,5 51 1 1 1 4 7 1 14% 3,29
04.05 - 04.10 4,13 ±4 6,5 52 3 3 2 8 1 13% 3,88
04.10 - 04.15 4,21 5 6,5 53 1 3 1 2 7 3 43% 3,43
04.15 - 04.30 4,38 15 6,6 55 1 2 2 4 4 4 17 10 59% 2,40 2
04.30 - 04.45 4,63 15 6,6 58 1 3 5 3 3 1 16 5 31% 2,38 5
04.45 - 05.00 4,88 ±9 6,6 61 2 2 3 1 8 3 38% 2,25 1
05.00 - 05.15 5,13 15 6,6 63 1 3 5 7 2 1 19 8 42% 2,47 2
05.15 - 05.30 5,38 15 6,6 66 1 2 4 2 5 4 1 19 11 58% 2,26 1
05.30 - 05.45 5,63 15 6,6 68 1 5 5 4 3 18 4 22% 3,11 2
05.45 - 06.00 5,88 ±14 6,5 70 2 2 6 1 1 12 4 33% 2,75
23.20 - 06.00 2,67379 min 3 12 49 75 98 172 156 108 1216 188 53% 2,80 14 35
= 6,3 h [353] [673]
? -2 -1 0 1 2 3 4 5 N N~ %~ m
Total: Leonids LEO 543 3 12 49 75 98 172 156 108 1216 188 53% 2,87
Taurids TAU 1 1 3 2 6 1 14 1 8% 2,15
Sporadic SPO 10 1 1 3 9 5 6 35 2 8% 3,36
Tm = mean time-interval
Teff = effective observation time
Lm = mean limiting magnitude
Alex Scholten, november 17/18 : ZHR-graph
Peter Bus, november 17/18
Observer: Eisse Pieter (Peter) Bus (BUSPE)
Eerste Spoorstraat 16, NL-9718 PB Groningen,
The Netherlands
Date: November 17/18, 1999
Location: Almodôvar, Portugal, 37º 30' 40" N, 8º 04' 03" W,
Altitude 290m.
Direction:NE, Elevation: 50º
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Time (UT) Teff. Limited n-Leo ZHR
mid. period min. magnitude (assuming r=3.5
Elev. Rad. and Cp=1.0)
(assuming
RA 153º.6
Decl.+21º.9)
_____________________________________________________________
0h07.5m 15 4.3 5.4 1 -
0h22.5m 15 7.9 5.5 4 -
0h37.5m 15 10.7 5.6 5 -
0h52.5m 15 12.5 5.7 6 -
1h10m 20 15.9 6.2 27 726 ± 139
1h52.5m 12 24.1 6.5 126 2208 ± 197
2h03.2m 3,5 26.2 6.4 64 3906 ± 488
2h08.5m 9 27.1 6.3 112 2884 ± 272
2h19.5m 9 29.4 6.3 79 1832 ± 206
2h37.5m 10 33.0 6.4 66 1051 ± 129
2h52.5m 13 35.9 6.4 53 585 ± 80
3h02.5m 5 37.9 6.3 17 518 ± 126
3h37.5m 15 44.9 6.5 28 182 ± 34
3h50m 9 46.4 6.5 16 168 ± 42
4h10m 10 51.3 6.5 14 119 ± 32
_____________________________________________________________
_____________________________________________________________
Magnitude distribution: 00h00m UT-04h15m UT (Teff. = 2h52m)
_____________________________________________________________
Mid.Time: -4 -1 0 1 2 3 4 5
in UT mean
_____________________________________________________________
0h07.5m 1 2
0h22.5m 1 1 1 1 1.5
0h37.5m 1 1 2 1 1.6
0h52.5m 1 1 3 1 2.5
1h10m 1 1 2 6 6 10 1 1.74
1h52.5 1 5 10 24 52 34 2.79
2h03.2m 1 2 5 10 28 18 2.81
2h08.5m 1 2 6 19 39 37 8 3.11
2h19.5m 1 5 12 26 30 5 3.19
2h37.5m 2 4 10 21 24 5 3.15
2h52.5m 1 3 8 17 18 6 3.24
3h02.5m 1 3 6 5 2 3.2
3h37.5m 1 3 9 8 7 3.6
3h50m 2 5 6 3 3.6
4h10m 1 2 4 5 2 3.4
______________________________________________________________
Totaal: -4 -1 0 1 2 3 4 5 mean
______________________________________________________________
Leonids: 1 4 15 39 94 194 169 38 3.01
Taurids: 1 1 2 3 2.0
Sporadics: 1 1 1 7 14 3.33
_____________________________________________________________
Notes:
-Keep in mind, I am not an experienced visual meteor observer.
-Moon was setting at about 1h30m UT
-Because of fog and smoke at low altitudes transparency
of the sky was variable.
-Operating different instruments causes the gaps in the
observation periods.
-Bursts of 5-7 meteors per second in the period 2h04m-2h07m UT.
-Maximum observed at about 2h03m UT at
Solar Longitude 235.286 (J2000).
-Elevation Radiant is corrected for altitude.
Peter Bus, november 17/18 : ZHR-graph
