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(meteorobs) Meteor Report 20/21, 1996 GRALE
DATE: Jul 20/21 1996 BEGIN: 0630UT END: 0840UT
OBSERVER : GRALE (Lewis J. Gramer)
LOCATION : Long: 73o 01' 45" W; Lat: 42o 34' 00" N
City & State: Shady Pines, Savoy, MA, USA; Elevation: 1720'
RECORDING METHOD: Tape Recorder and Plotting
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OBSERVED SHOWERS: Use 3 letter Codes
CAP 300 -12 (RA 20h00)
SDA 334 -18 (RA 22h16)
NDA 320 -9 (RA 21h22)
PER 19 +52 (RA 01h18)
PAU 335 -32 (RA 22h22)
Non-IMO: (see Remarks)
ALY 281 +38 (Alpha Lyrids) (RA 18h44)
ACY 305 +48 (Alpha Cygnids) (RA 20h20)
ODR? 285 +57 (Omicron Draconids) (RA 19h00)
"EPR" 41 +57 ("Eta Perseids") (RA 02h44)
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OBSERVING PERIODS:
PERIOD(UT) FIELD LM Teff F CAP SDA NDA PER PAU SPOR
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0630-0840 22h+65 6.74 1.63h 1.0 0 0 1 5 0 25
[
Non-IMO "Sporadic" Breakdown: ALY ACY ODR "EPR" SPOR
0 3? 2 3 17
]
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MAGNITUDE DISTRIBUTIONS:
SHOWER -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 TOTAL
CAP 0
SDA 0
NDA 1 1
PER 2 2 1 5
PAU 0
SPOR 1 1 1.5 1 5.5 5.5 2 3 4 .5 25
Total: 1 1 1.5 1 7.5 7.5 2 5 4 .5 31
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SKY OBSCURED:
%0 THROUGHOUT
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MEAN MAGNITUDES
SPOR = +2.88
NDA = +5.00 (sample of 1 meteor)
PER = +3.00 (sample of 5 meteors)
DEAD TIME:
Period 1 29 plots 00h22m
TOTAL : 00h22m
BREAKS :
Period 1 0719-0730 00h11m
TOTAL : 00h11m
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LIMITING MAGNITUDE:
STAR STAR
TIME AREA COUNT LM (mins in effect)
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0645 7 36 7.0 15
0700 7 44 7.1 15
0700 18 37 7.2 15
0715 18 44 7.3 15
0740 7 49 7.3 20
0740 18 45 7.3 20
0800 2 26 6.7 18
0800 6 29 6.8 18
0815 2 17 6.3 17
0815 7 25 6.8 17
0815 18 23 6.5 15
0830 7 12 5.5 15
0830 18 10 5.5 15
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MEAN LIMITING MAGNITUDE: 6.74
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METEOR DATA
PLOT
# TIME (UT) SPEED TRAIN ACCU-
H min MAG 1-5 COLOR SHWR SEC MAP # RACY
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1 0630 5 3.5 NDA 1 1 *
2 0633 2 3.5 pale grn Spor 2 2
3 0636 5 2.5 Spor 1 1
4 0640 -3 4 brit org Spor 1 1
5 0643 3.5 4 Spor 1 1
6 0645 3 3.5 Spor 3 2 *
7 0646 2 3.5 Per 3 1
8 0649 6 3.5 Spor 1 1 *
9 0650 5 3 Per 1 1 *
10 0700 6 2 Spor 1 2
11 #### NO METEOR 11! GAP IN SEQUENCE.
12 0702 4.5 3 Spor 3 2
13 0711 5 2.5 Spor 1 1
14 0715 2 3 Spor 1 1 *
15 0716 3 4 Per 2 2
16 0733 4 3 Spor 2 1 *
17 0734 3 3.5 Spor 3 2
18 0736 2.5 4 Spor 2 1 *
19 0740 0 3 wht Spor 3 1
20 0740 6 2.5 Spor (no plot)
21 0741 2 3 dull org Spor 3 2
22 0742 2 2.5 pale grn Spor 1.0 2 1
23 0745 1.5 3.5 org Spor 2 1 *
24 0748 3 2.5 Spor 1 1
25 0748 2 3.5 Per 4 2 *
26 0750 6.5 2 Spor 1 2 *
27 0757 5.5 2 Spor 2 2 *
28 0805 0.5 0.5 lite grn Spor 1 2 *
29 0809 -4 2.5 blu-wht Spor (no plot)*
30 0811 3 3 Spor 1 1
31 0831 3 3 Per 1 2 *
32 0836 2.5 3 Spor 2 1
## 0840 ENDED SESSION IN BRIGHT TWILIGHT
* - Meteors marked by asterisks have additional data in the Remarks.
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VELOCITY SCALE: PLOT ACCURACY:
0 = Stationary 1 = Accurate Plot
1 = Very Slow 2 = Normal Plot
2 = Slow 3 = Generalized Direction
3 = Medium
4 = Fast
5 = Very Fast
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REMARKS: Seeing throughout session was medium to medium-poor.
Rapid-moving cirrus was apparent early in watch (before 0700UT),
which affected limiting magnitudes but did not obstruct sky.
Dead time of 45 seconds was deducted per plotted meteor.
Meteor #1 is a questionable NDA due to path length.
Meteor #6 was noted as possibly from a new radiant near Eta Per
(non-IMO shower). Path, length may be acceptable matches, speed
is just within acceptable range (med-to-medfast vs. very-fast).
Meteor #8 was noted as possibly from a new radiant near Eta Per
(non-IMO shower). Path and length are excellent matches, speed
is just within acceptable range (med-to-medfast vs. very-fast).
Meteor #9 is a questionable PER due to apparent speed.
Meteor #14 was noted as a possible ACY (non-IMO shower).
Meteor #16 was noted as a doubtful ACY (non-IMO shower), with
some doubt due to path length.
Meteor #18 was noted as a doubtful ACY (non-IMO shower), with
some doubt due to path length.
Meteor #23 was noted as possibly from a new radiant near Eta Per
(non-IMO shower). Path, length may be acceptable matches, speed
is just within acceptable range (med-to-medfast vs. very-fast).
Meteor #25 is a questionable PER due to alignment and speed.
Meteor #26 was noted as a possible ODR? (Omi Dra, non-IMO shower),
with uncertainty due to lack of velocity data for this shower.
Meteor #27 was noted as a possible ODR? (Omi Dra, non-IMO shower),
again uncertain due to lack of velocity data for this shower.
Meteor #28 was seen as semi-stationary, with a hint of direction.
Meteor #29 in NW UMa seen partly through trees and too low to plot.
Meteor #31 is a questionable PER due to alignment and speed.
Weather conditions:
Begin Temp: 55F Rel Humid: ~15% Wind: NW 15-20 G 50 kts (!)
Final Temp: 49F Rel Humid: ~10% Wind: WNW 10-25 kts