(meteorobs) August 12, 2005 Meteor Observations from Southern California

Robert Lunsford lunro.imo.usa at cox.net
Fri Aug 12 20:00:29 EDT 2005


Skies were partly cloudy during the day with altocumulus. Conditions
improved near dusk as the mid-level clouds drifted out to sea. I was
casually watching the southern skies around 2100 local time when a long
Perseid earthgrazer appeared over the house. It lasted three seconds (from
what I saw) and disappeared low in the southern sky. It was a deep orange
color and a great way to start the night. Stratus soon rolled in ending any
further observations from home. The skies at the Japatul helipad were
cloudless when Pete Gural and I arrived. We again set up four intensified
video units and began counting at 2330 PDT (0630 UT). Rates were fairly
steady throughout the morning with the best activity occurring during the
next to last hour. Clouds did appear in the south during the middle of the
watch and by 0400 PDT (1100 UT) they were obscuring the eastern sky. I
turned westward for the last 30 minutes to avoid the clouds. The Perseids
were once again very bright which made up for the average rates.
---------------------------------------------
Observer: Robert Lunsford (LUNRO)
Date: 05-Aug-12 Mean Solar Long: 139.682
Begin Time (UT) 630 End Time (UT) 1130

LOCATION: Japatul Helipad, USA
LONG: 116 40' 04" W LAT: 32 44' 52" N
Elevation: 760 m
METHOD: Visual/Cassette Recorder

Showers Observed
KCG  02:56 (284) +58, 0-0-1-0-0  1 Total
NDA  02:56 (044) +58, 1-0-1-0-0  2 Total
PER   02:56 (044) +58, 35-33-41-55-41  205 Total
SDA  02:56 (044) +58, 0-1-0-0-0   1 Total
SPO                              7-11-6-15-4  43  Total
Hourly Counts              43-45-49-70-45  252 Total
---------------------------
Period 1  0630-0730 UT
Weather: 64F (18C) 84% Humidity
F = 1.00 (0% Clouds) Mean LM 6.48
FOV 350d +55   TOTAL TeFF: 1.00
Mean Solar Long: 139.602

Magnitude Distribution
NDA +1 (1)  Mean + 1.00  Total 1
PER -2 (1), -1 (3), 0 (5), +1 (9), +2 (8),
       +3 (5), +4 (1), +5 (3)  Mean +1.54  Total 35
SPO +1 (1), +2 (4), +3 (0), +4 (1), +5 (1)  Mean + 2.57  Total 7
Meteors Observed: 43
----------------------------
Period 2  0730-0830 UT
Weather: 63F (17C) 88% Humidity
F = 1.00 (0% Clouds) Mean LM 6.34
FOV 005d +55   TOTAL TeFF: 1.00
Mean Solar Long: 139.642

Magnitude Distribution

PER -2 (3), -1 (0), 0 (4), +1 (10), +2 (8),
       +3 (5), +4 (3), +5 (0)  Mean +1.42  Total 33
SDA +4 (1)  Mean + 4.00  Total 1
SPO +1 (2), +2 (5), +3 (0), +4 (2), +5 (2)  Mean + 2.73  Total 11
Meteors Observed: 45
---------------------------
Period 3  0830-0930 UT
Weather: 63F (17C) 90% Humidity
F = 1.00 (0% Clouds) Mean LM 6.09
FOV 020d +55   TOTAL TeFF: 1.00
Mean Solar Long: 139.682

Magnitude Distribution

KCG +3 (1)  Mean + 3.00  Total 1
NDA +2 (1)  Mean + 2.00  Total 1
PER -4 (1), -3 (1), -2 (0), -1 (2), 0 (4), +1 (6),
       +2 (14), +3 (5), +4 (6), +5 (1)  Mean +1.59  Total 41
SPO +1 (1), +2 (2), +3 (2), +4 (1), +5 (0)  Mean + 2.50  Total 6
Meteors Observed: 49
---------------------------
Period 4  0930-1030 UT
Weather: 63F (17C) 88% Humidity
F = 1.00 (0% Clouds) Mean LM 6.35
FOV 035d +55   TOTAL TeFF: 1.00
Mean Solar Long: 139.722

Magnitude Distribution

PER -4 (1), -3 (1), -2 (1), -1 (4), 0 (3), +1 (13),
       +2 (10), +3 (9), +4 (10), +5 (3)  Mean +1.85  Total 55
SPO +2 (6), +3 (4), +4 (5), +5 (0)  Mean + 2.93  Total 15
Meteors Observed: 70
---------------------------
Period 5  1030-1130 UT
Weather: 64F (18C) 88% Humidity
F = 1.00 (0% Clouds) Mean LM 6.16
FOV 050d +55   TOTAL TeFF: 1.00
Mean Solar Long: 139.762

Magnitude Distribution

PER -5 (1), -4 (0), -3 (1), -2 (1), -1 (5), 0 (3), +1 (10),
       +2 (10), +3 (5), +4 (3), +5 (2)  Mean +1.27  Total 41
SPO +1 (1), +2 (1), +3 (1), +4 (0), +5 (1)  Mean + 2.75  Total 4
Meteors Observed: 45
-----------------------
Total Magnitude Distribution
KCG +3 (1)  Mean + 3.00  Total 1
NDA +1 (1), +2 (1)  Mean + 1.50  Total 2

PER -5 (1), -4 (3), -3 (3), -2 (6), -1 (14), 0 (19), +1 (48),
       +2 (50), +3 (29), +4 (23), +5 (9)  Mean +1.56  Total 205
SDA +4 (1)  Mean + 4.00  Total 1
SPO +1 (5), +2 (18), +3 (7), +4 (9), +5 (4)  Mean + 2.74  Total 43
Meteors Observed: 252






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