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(meteorobs) Observation July 26/27 2001
On July 26/27, I watched for 3 hours TEFF until morning dawn. I was
setup at the lagoon site near St-Albert, and had the company of Denis
Legault who was busy doing deep sky objects. The sky was very
transparent for a limiting magnitude reaching 6.5.
Meteor rates kept me quite busy with a total of 70 seen. With so much
activity going on, I decided not to do plotting but cord alignment
instead. The south Delta Aquarids were quite good with 18 seen. The
Perseids were also starting to show up a bit more frequently. The
highlights...
At 5:54UT, a bright mag +1 Perseid and a faint sporadic appeared
almost simultaneously!
At 6:40UT, a south Delta Aquarid near its radiant was forshortened
and appeared to "disintegrate" near the end of its path. It was
strange.
A very pleasant observing night!
Pierre Martin
DATE: July 26/27 2001
BEGIN: 4:48 UT (0:48 EDT) END: 8:00 UT (4:00 EDT)
OBSERVER: Pierre Martin (MARPI)
LOCATION: Long: -75.063 West; Lat: 45.269 North Elevation:100m
City & Province: St-Albert, Ontario, CANADA
RECORDING METHOD: talking clock/tape recorder
-----------------------------------------------------------------------
OBSERVED SHOWERS: 3-letter code; radiant position
NDA (N. Delta Aquarids) 21h30 -09
SDA (S. Delta Aquarids) 22h22 -17
SIA (S. Iota Aquarids) 21h25 -18
SIG (Sigma Capricornids - Anthelions) 20h55 -17
CAP (Alpha Capricornids) 20h03 -12
PAU (Pisces Austrinids) 22h25 -32
PER (Perseids) 01h25 +52
ACY (Alpha Cygnids) 20h36 +49
-----------------------------------------------------------------------
OBSERVING PERIODS: 0 = none seen; / = shower not observed
PERIOD(UT) FIELD Teff LM SPO SDA PER SIG CAP NDA SIA PAU ACY napx sapx
4:48-5:48 21h10 +10 1.00 6.50 11 4 1 1 2 0 0 0 0 0 0
5:48-6:48 21h44 +09 1.00 6.50 8 9 2 1 0 1 0 0 0 3 1
6:48-8:00 23h04 +15 1.12 6.40 12 5 4 1 0 2 0 0 0 2 0
---------------------------------------------------------------------------
TOTALS: 3.12 31 18 7 3 2 3 0 0 0 5 1 = 70
---------------------------------------------------------------------------
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 0 +1 +2 +3 +4 +5 +6 AVERAGE
SPO 2 0 8 11 8 8 0 +3.27
SDA 0 0 2 6 6 3 1 +3.72
PER 0 1 2 2 2 0 0 +2.71
NDA 0 0 0 2 0 1 0 +3.66
SIG 0 0 1 0 2 0 0 +3.33
CAP 0 0 0 2 0 0 0 +3.0
---------------------------------
TOTALS: 2 1 13 23 18 12 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: 5 minutes
Breaks: 7:32-7:37
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