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(meteorobs) NAMN Report: Nov 16/17 (Gramer)



***************************
NAMN VISUAL SUMMARY REPORT
***************************

DATE: Nov 16/17 1996   BEGIN: 0645UT  END: 0905UT
OBSERVER : GRALE (Lewis J. Gramer)
LOCATION : Long: 71o 01' 11".5 W;  Lat: 44o 16' 09".4 N
City/State: Basin Camp, Evans Notch, NH, USA;  Elevation: 2600'?
RECORDING METHOD: Manual

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OBSERVED SHOWERS: Use 3 letter Codes; position; diameter; (name)
   LEO     152 +22  5o    (Leonids)
   NTA      63 +23  10x5  (North Taurids)
   STA      61 +16  10x5  (South Taurids)
   TAU                    (AMBIGUOUS North/South Taurid)

----------------------------------------------------------------
OBSERVING PERIODS:  (0 = none seen;    / = shower not watched)
PERIOD(UT)  FIELD   Teff   F      LM    LEO NTA STA TAU AMO SPOR
----------------------------------------------------------------
0645-0800   07h+30  0.90h  1.00   7.38  28  3   3   1   /   13
0800-0905   08h+30  0.77h  1.00   7.50  29  2   0   1   /   5

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MAGNITUDE DISTRIBUTIONS:

SHOWER -6 -5  -4  -3 -2  -1  0    +1  +2  +3  +4   +5  +6  +7  TOTAL
LEO       1.5 0.5  3 5.5 8.5 10   3.5 7   6.5 5.5  3.5 0.5 0.5 56 (+1?)
NTA                                       2   3                5
STA                                   2   1                    3
TAU                                       0.5 1.5              2
SPOR                     0.5 0.5  0.5 3   7   5.5      1       18
Total:    1.5 0.5 3  5.5 9   10.5 4   12  17  15.5 3.5 1.5 0.5 84 (+1?)

-----------------------------------------------------------------------
SKY OBSCURED:
%0    FROM: 0645UT  TO: 0905UT

-----------------------------------------------------------------------
DEAD TIME: 00h12m   (Period 1)
           00h09m   (Period 2)
BREAKS   :
      0705UT-0709UT (Period 1 -  4 mins)
      0740UT-0745UT (Period 1 -  5 mins)
      0814UT-0824UT (Period 2 - 10 mins)
TOTAL    : 00h21m

MEAN MAGNITUDES
SPOR = +3.22
LEO  = +0.80   (apparently bimodal!)
NTA  = +3.60   (sample of  5 meteors)
STA  = +3.06   (sample of  3 meteors)
TAU  = +3.75   (sample of  2 meteors)

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LIMITING MAGNITUDE:
       STAR  STAR
TIME   AREA  COUNT LM     (mins in effect)
-----------------------------------------------------------------------
0645    4    28    7.3    30
0645    17   51    7.1    30
0745    9    45    7.5    60 = 45 + 15
0745    4    31    7.5    60 = 45 + 15
0855    4    33    7.5    50
0855    9    45    7.5    50

MEAN LIMITING MAGNITUDE: 7.44

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METEOR DATA

#   TIME(UT)  MAG    SPEED  COLOR   SHOWER  TRAIN     NOTES
-----------------------------------------------------------------------
##  0645     BEGAN SESSION
1   0646     -1      4      Pal Org LEO     1.5 sec
2   0649      4      3              Spor
3   0650     -1      4      Org     LEO
4   0650      0      4      Wht     LEO               Strong White.
5   0651      3      4              LEO
6   0653      0      4      Pal Org LEO
7   0656     -2      4      Org     LEO     +
8   0656      4      4              LEO
9   0657      0      5      Wht Org LEO
10  0658      5      4              LEO
11  0658      3      3              Spor
12  0700      4      2.5            TAU
13  0700      3      3              Spor
14  0704      2      4              LEO     1.5 sec
15  0710      3      2              STA
16  0710      4      4              LEO
17  0711      3.5    4              Spor
18  0712      2.5    4              Spor    +
19  0713      3      4              LEO
20  0714      4      2              NTA
21  0717      2      3.5            STA
22  0717     -1      4              LEO     3 sec
23  0718     -2      4      Org Wht LEO
24  0726      3      4              LEO
25  0728      4      3              Spor
26  0728      2.5    4              LEO
27  0730      4      4              LEO
28  0730      4      /              Spor
29  0730      5      4              LEO
30  0732      2      3              STA     +
31  0734      3.5    2              NTA
32  0736      1.5?   3              Spor    +
33  0736      2      4              LEO     1.5 sec
34  073810   -3      4      Org     LEO     35 sec    Lovely!
35  0740     -1      4      Wht     LEO               Strong White.
36  0740      1      4              LEO     3 sec
37  0745      4      3              Spor
38  0747      0      4              LEO     3.5 sec
39  0747      2      4              LEO
40  0749      0      3              LEO?    2 sec
41  0750      3      3              Spor
42  0752      3      3.5            Spor
43  0753      3.5    4              LEO
44  0753      6      2.5            Spor
45  0756      3      2              NTA
46  0758     -1      4              LEO
47  0758      3      2.5            Spor
48  0758     -2      4              LEO
49  0800      3.5    2              NTA
50  0801      2      3.5            Spor
51  0802      2      4              LEO     2 sec
52  0804     -0.5    3.5    Blu Wht Spor    0.5 sec
53  080510   -4.5    4      Org Grn LEO     2 sec     (*)
54  0806     -1      4      Pal Blu LEO
55  0808     -2      4      Blu     LEO     0.5 sec
56  0808      0      4      Wht     LEO     1 sec     Strong White.
57  0811      5      4              LEO
58  0811      2.5    4      Pal Grn LEO     2 sec
59  0811      4.5    4              LEO     +         Dim-meteor wake!
60  0812     -1      4              LEO               Seen in trees.
61  0827      3.5    2              TAU
62  083350   -3      4      Grn Yel LEO     2 sec
63  0834      0      4      Org Yel LEO     3 sec
64  0836      3.5    3.5    Pal Org LEO     +         (*)
65  0837     -2      4      Org     LEO     1 sec
66  083730   -3      4      Blu Wht LEO     0.5 sec
67  0839      2      3              Spor    0.5 sec
68  0841      6.5    3.5            LEO
69  0841      1      3      Org     LEO     0.5 sec
70  0842      0      4      Wht     LEO     4 sec     Strong White.
71  0842      0      4      Wht Org LEO     0.5 sec
72  0843     -1      4      Org Grn LEO
73  0844      /      /      /       LEO     /         (*)
74  0845      1      4              LEO     2.5 sec   Elevation: 10o
75  0845      2      4              LEO
76  0846     -1.5    4      Blu Grn LEO     2 sec
77  0848      4      2              NTA
78  0848      4      2.5            Spor
79  0851      2.5    4              LEO
80  085550   -5      4      Wht     LEO     25 sec    (*)
81  0855      0      4              LEO
82  0858      3      4              LEO
83  0858      3      3.5            Spor
84  0900      4      4              LEO
85  0902      1.5    3.5            LEO     1 sec
##  0905     ENDED SESSION

TRAIN of "+" indicates a meteor with a "wake" [< 0.5 second train].
(*) - Meteors marked by asterisks have additional data under Remarks

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VELOCITY SCALE:
0 = Stationary
1 = Very Slow
2 = Slow
3 = Medium
4 = Fast
5 = Very Fast

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REMARKS: Seeing throughout session was poor.

Dead time of 15 seconds was deducted per recorded meteor.

Meteors noted as "Strongly White" gave a strong color impression
  that was predominantly white, as opposed to meteors with no color.

Meteor #53 exhibited many "sparkles", that is, indistinct fragments
  along its 30o trail. At the end, it broke into at least 5 sizeable
  fragments which quickly disappeared, leaving a 10o colorless train.
Meteor #64 not only exhibited a definite pale-orange tinge despite
  its low magnitude (3.5), but the very same color was definitely
  observed in its dim wake! A very unusual dim Leonid.
Meteor #73 had no magnitude or speed noted: simply a shower (LEO).
Meteor #80 was a bright "electric white" fireball, very like an
  electrical arc, which was mag 0 with a terminal burst to -5.

NOTE ON TRAINS: 47% of LEOs had trains. 22% of Spors had trains.

NOTE ON MAGNITUDE DISTRIBUTIONS: As can be seen above, the Leonids
  at this apparition exhibited what clearly appears to be a bimodal
  distribution, with modes at roughly 2.7 and -0.2. The latter mode
  has a particularly steep dim-side curve, especially if even a small
  projected tail from the lower-magnitude mode is subtracted from it.
  The obvious (but debatable) conclusion is that, for a shower with
  the relatively normal population index of the LEOs, the higher mode
  represents the leading edge of a second "storm" stream embedded
  within the main Leonid stream. Next year will be worth watching!

Temp at beginning of session: 25o F  Humidity: 60%
Temp at end of session:       17o F  Humidity: 30%

<END OF REPORT>