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(meteorobs) Observation July 13/14 2002
The night of July 13/14 was my final night at the North Bay Star
Party. Earlier on that day, the forecasts did not look too
promising. We noticed storm cells forming just north of us, but
fortunately they missed. An updated forecast was now calling for
clearing skies near midnight local time. Indeed, it did clear around
midnight and I was able to take advantage of some more observing.
Much of my time of this night was spent at various scopes that were
setup, and enjoying deep sky observing of many fine targets.
This time, my meteor session was fairly short 0.95 hours TEFF
(effective time). The sky had some scattered clouds remaining in the
North but was quite clear to the south allowing an average limiting
magnitude of 6.57.
I recorded 12 meteors (including 1 Alpha Capricornid, 1 July Pegasid,
1 meteor from the north apex and 9 random sporadics).
The highlight was at 6:18UT when a 1st magnitude, medium speed
sporadic appeared. It flared 3X on its 20 degrees long path, moving
just north of the square of Pegasus.
As with the previous sessions, I was plotting most of the activity.
Pierre Martin
Ottawa, Ontario
DATE: July 13/14 2002
BEGIN: 0610 UT (0210 EDT) END: 0709 UT (0309 EDT)
OBSERVER: Pierre Martin (MARPI)
LOCATION: Long: -79.368 West; Lat: 46.081 North Elevation: 50m
City & Province: Powassan, Ontario, CANADA
RECORDING METHOD: talking clock/tape recorder
-----------------------------------------------------------------------
OBSERVED SHOWERS:_______________________________________radiant position
ACY (Alpha Cygnids)_____________________2012 +47
SAG (Sagittarids antihelion source)_____2024 -18
CAP (Alpha Capricornids)________________1932 -14
JPG (July Pegasids)_____________________2256 +16
NDA (North Delta Aquarids)______________2104 -10
SDA (South Delta Aquarids)______________2156 -19
PAU (Pisces Austrinids)_________________2200 -34
napx (sporadics from the north apex)____0124 +24
sapx (sporadics from the south apex)____0124 -06
SPO (random sporadics)
-----------------------------------------------------------------------
OBSERVING PERIODS: 0 = none seen; / = shower not observed
PERIOD(UT)__FIELD____Teff__LM____SPO_ACY_CAP_SAG_JPG_NDA_SDA_PAU_napx_sapx
0610-0709___2144+17__0.95__6.57__9___0___1___0___1___0___0___0____1____0 = 12
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 did not
spent looking at the sky). One hour = 1.00 teff. The fourth 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
SPO: +1(1) +2(2) +3(5) +4(1) +5(1) AVE: +2.9
CAP: +1(0) +2(0) +3(0) +4(0) +5(1) AVE: +5.0
JPG: +1(1) +2(0) +3(0) +4(0) +5(0) AVE: +1.0
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 (last column) for showers.
------------------------
SKY OBSCURED:
None
Corresponding F value for this session is 1.00
------------------------
Dead time:
- 1.82 min used for plots.
Breaks (UT): None
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