Leonids 1999: Observational Results!

The DMS Leonid Expedition 1999 in Portugal


Team "Almod˘var": 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

(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        : Almod˘var (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: Almod˘var, Portugal, 37║ 30' 40" N, 8║ 04' 03" W, 
          Altitude 290m.
Direction:NE, Elevation: 50║
_____________________________________________________________

Time (UT)     Teff.         Limited    n-Leo       ZHR
mid. period   min.         magnitude          (assuming r=3.5
                   Elev. Rad.                   and Cp=1.0)
                   (assuming
                   RA 153║.6
                 Decl.+21║.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



Back to
DMS homepage
back.gif This page was last modified on December 15, 1999 by
Olga van Mil and Peter Bus and Casper ter Kuile