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(meteorobs) Observation July 20/21 2001
The Friday night July 20/21 proved to have far worse transparency.
This was due to haze, humidity, thin clouds and smog. However, enough
stars peered through for a small meteor session until thicker clouds
came by. The lack of light pollution at this site was helpful,
because I was surprised that 6th magnitude stars could still be
spotted given the conditions. I watched for nearly 2 hours, recording
17 meteors. The highlights included a magnitude -2 yellow sporadic
that left behind a 4 second train, and also a 20 degree long
magnitude +1 pink Perseid.
Pierre Martin
DATE: July 20/21 2001
BEGIN: 3:40 UT (23:40 EDT) END: 5:25 UT (1:25 EDT)
OBSERVER: Pierre Martin (MARPI)
LOCATION: Long: -79.368 West; Lat: 46.081 North Elevation:100m
City & Province: Powassan, Ontario, CANADA
RECORDING METHOD: talking clock/tape recorder
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OBSERVED SHOWERS: 3-letter code; radiant position
NDA (N. Delta Aquarids) 21h05 -10
SDA (S. Delta Aquarids) 22h17 -17
SAG (Sagittarids) 19h55 -18
CAP (Alpha Capricornids) 19h40 -15
PAU (Pisces Austrinids) 22h06 -33
PER (Perseids) 01h00 +52
ACY (Alpha Cygnids) 20h22 +48
-----------------------------------------------------------------------
OBSERVING PERIODS: 0 = none seen; / = shower not observed
PERIOD(UT) FIELD Teff LM SPO SDA PER SAG CAP NDA PAU ACY napx sapx
3:40-4:42 19h58 +30 0.99 6.10 7 1 1 2 0 1 0 0 1 0
4:42-5:25 21h06 +31 0.72 6.20 4 0 0 0 0 0 0 0 0 0
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TOTALS: 1.71 11 1 1 2 0 1 0 0 1 0 = 17
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The first column (Period UT) refers to observing periods broken down
as close as possible to one hour of true observing, in Universal
Time. The second column (Field) is the area in in the sky where I
centered my field of view. The third column (TEFF) represents
effective observing time (corrected for breaks or any time I spent
not looking at the sky). One hour = 1.00 teff. The fourth column (F)
is for sky obstructions (clouds, buildings, ect). No obstructions =
1.00 but any obstructions will make this number slightly higher. The
5th column (LM) is the average naked eye limitimg magnitude,
determined by triangle star counts. All following columns indicate
the number of meteors for each shower observed.
MAGNITUDE DISTRIBUTIONS:
SHOWER -2 -1 0 +1 +2 +3 +4 +5 AVERAGE
SPO 1 0 0 0 3 2 5 1 +2.91
SAG 0 0 0 1 1 0 0 0 +1.5
PER 0 0 0 1 0 0 0 0 +1.0
SDA 0 0 0 0 0 0 1 0 +4.0
NDA 0 0 0 0 0 0 1 0 +4.0
--------------------------------------------
TOTALS: 1 0 0 2 4 2 7 1
--------------------------------------------
Note: Magnitude scale is to determine the brightness of sky objects.
Magnitude -8 is comparable to a quarter moon, magnitude -4 with the
planet Venus, magnitude -1 with the brightest star Sirius, magnitude
+2 to +3 with most average naked eye stars and magnitude +6 to +7 are
the faintest stars the naked eye can see under typical dark
conditions. A meteor of at least magnitude -3 is considered a
fireball. The above table contains the magnitudes from all observed
meteors, and the average for showers.
SKY OBSCURED:
None
------------------------
Dead time (amount of time spent not looking up): 2.31 minutes
Breaks: None
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