(meteorobs) Observation August 4/5 2011
Pierre Martin
pmartin at teksavvy.com
Wed Aug 10 01:39:21 EDT 2011
Here's my session from last Friday morning, August 5. I was a little
too tired to drive to a remote site so I went to the Pendleton
Airport, which is just a 35 minutes drive from my house. The sky was
very hazy/murky near the horizons, but actually quite good overhead.
It was also warm at 17C and rather dewy and humid.
Signing on at 12:20am EDT, I observed for over 3 hours, getting 72
meteors. The rates were quite decent in the first and final hours,
but the second hour was strangely absent of sporadic and Perseid
activity. I am sure that I was fully awake too! It's a good thing
that the Delta Aquarids were active during this time, otherwise it
would have been a long lull.
The August Piscid radiant was surprisingly active towards the end of
the night.
The best meteor was at 12:48am EDT when a mag -2 yellow-white Perseid
shot 30 degrees through the rich Milky Way in Cygnus, leaving a four
sec train behind.
Pierre Martin
Ottawa, Ontario
DATE: August 4/5 2011
BEGIN: 04:20 UT (00:20 EDT) END: 07:30 UT (03:30 EDT)
OBSERVER: Pierre Martin (MARPI)
LOCATION: Long: -75.092 West; Lat: 45.568 North
Observing site: Pendleton Airport, Ontario, CANADA
RECORDING METHOD: talking clock/tape recorder, plotting
----------------------------------------------------------
OBSERVED SHOWERS:_______________________________radiant position
PER (Perseids)__________________________________01:58 +54
CAP (Alpha Capricornids)________________________20:22 -10
ANT (Antihelions)_______________________________21:20 -14
SDA (South Delta Aquarids)______________________22:45 -16
PAU (Pisces Austrinids)_________________________22:56 -29
AUP (August Piscids - IMO video database)_______00:30 +18
SPO (sporadics)
----------------------------------------------------------
OBSERVING PERIODS: 0 = none seen; / = shower not observed
PERIOD(UT)___FIELD_____Teff___LM____SPO_PER_SDA_CAP_ANT_PAU_AUP
04:20-05:20__315 +10___1.00___6.29__10___8___1___1___2___0___2
05:20-06:20__331 +11___1.00___6.38___2___1___6___1___0___0___0
06:20-07:30__348 +08___1.10___6.37__14___8___5___0___5___1___5
TOTALS:________________3.10_________26__17__12___2___7___1___7 = 72
Notes: The first column (Period UT) refers to observing periods, 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) Teff is
simply the total time during the observing session spent actually
watching the sky. Breaks and/or dead time are not included in the
reported Teff. It is reported in decimal format such that a 60 minute
observing session would be reported as Teff = 1.00. The column (LM) is
the average naked eye limiting magnitude seen. All following columns
indicate the number of meteors for each shower observed. For more
info, see: http://www.namnmeteors.org/guidechap2.html
------------------------
MAGNITUDE DISTRIBUTIONS:
SHOWER
_____-2__-1___0__+1__+2__+3__+4__+5______AVE
SPO___0___0___1___4___8___3___5___5_____+2.84
PER___1___2___2___2___4___2___3___1_____+1.71
SDA___0___0___0___2___2___0___5___3_____+3.41
ANT___0___0___0___1___1___1___3___1_____+3.29
AUP___0___0___0___0___3___1___2___1_____+3.14
CAP___0___0___0___0___1___1___0___0_____+2.50
PAU___0___0___0___0___1___0___0___0_____+2.00
Note: 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
(IMO definition). The above table contains the magnitudes from all
observed meteors, and the average (last column) for showers.
------------------------
SKY OBSCURED (FOV) (UT): none
------------------------
Dead time: 4 min (break)
Breaks (UT): 6:21-25
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