[Meteorobs] Observation September 25/26 2009
Pierre Martin
dob14.5 at sympatico.ca
Sat Oct 24 13:13:17 EDT 2009
I got out for a two hours morning meteor session, under ideal sky
conditions. The transparency started above-average, and down a bit to
average quality towards the end. Although the sky stayed good
overhead, the ground was more damp and some ground fog could be seen
moving in and out. The temperature reached freezing, so I was glad to
have several layers on to stay warm.
I two hours, I recorded 27 meteors, only three of which were South
Taurids/antihelions.
Thw highlight was at 1:29am EDT when a mag -3 blue-green sporadic shot
a long 20 degrees across southern Cetus, and left behind a 4 seconds
persistent train. Another memorable meteor was the near-earthgrazer
at 2:52am that persisted for 40 degrees, going from southern Andromeda
to western Lacerta.
Pierre Martin
Ottawa, Ontario
DATE: September 25/26 2009
BEGIN: 05:15 UT (01:15 EDT) END: 07:22 UT (03:22 EDT)
OBSERVER: Pierre Martin (MARPI)
LOCATION: Long: -76 29' West; Lat: 45 23' North
Observing site: Bootland Farm, Ontario, CANADA
RECORDING METHOD: talking clock/tape recorder, plotting
----------------------------------------------------------
OBSERVED SHOWERS:_______________________________radiant position
STA (South Taurids)______________________________01:22 +06
SPO (sporadics)
----------------------------------------------------------
OBSERVING PERIODS: 0 = none seen; / = shower not observed
PERIOD(UT)____FIELD_______Teff___F______LM_____SPO_STA
05:15-06:17___02:51 +19___1.00___1.00___6.65____8___2
06:17-07:22___03:34 +17___1.01___1.00___6.53___16___1
TOTALS:___________________2.01_________________24___3 = 27
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 F is a
correction when obstructions such as clouds block portions of the
field of view (1.00 = 100% clear skies). 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
_____-3__-2__-1___0__+1__+2__+3__+4__+5______AVE
SPO___1___0___0___0___3___4___5___7___4_____+2.96
STA___0___0___0___0___0___0___1___2___0_____+3.66
Notes: 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: 5.98 min (plotting)
Breaks (UT): none
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