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(meteorobs) NAMN Report: Nov 16/17 (Gramer)
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NAMN VISUAL SUMMARY REPORT
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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)
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OBSERVING PERIODS: (0 = none seen; / = shower not watched)
PERIOD(UT) FIELD Teff F LM LEO NTA STA TAU AMO SPOR
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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?)
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SKY OBSCURED:
%0 FROM: 0645UT TO: 0905UT
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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)
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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
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## 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>