(meteorobs) Observation October 23/24 2011
Pierre Martin
pmartin at teksavvy.com
Tue Nov 29 00:25:41 EST 2011
Due to poor weather, I managed to get out only once for this year's
Orionids. Even on then, I managed less than 3 hours, due to clouding
over skies. The transparency was 2/5 or below average, and the
temperature was near freezing. It was quite an enjoyable session
though, with decent Orionids rates. Just five minutes into my watch,
a spectacular earthgrazing sporadic was seen. It came out of the
north-east, reaching mag -2 as it shot a persistent 50 degrees path!
It changed from yellow to orange as it climbed on an angle against the
horizon, and left a train persisting for a few seconds. This was
definitely one of the more dramatic meteors that I've seen this year!
This followed just a minute later by a bright mag -1 blue-green
Orionid near its radiant.
Several members of the Orionids were seen over the next several
minutes despite a low radiant. This raised my hopes of an unusually
good showing. However, the Orionids did not get any more active as
the night went on.
The strangest meteor was an Orionid at 1:31AM EDT. It was a very
faint mag +5 streak that actually left a visible and very noticeable
wake.
Pierre Martin
Ottawa, Ontario
DATE: October 23/24 2011
BEGIN: 04:00 UT (00:00 EDT) END: 06:42 UT (02:42 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:
October Ursa Minorids (OUI) - 18:18 (275) +75
Northern Taurids (NTA) - 02:48 (042) +20
Southern Taurids (STA) - 02:51 (043) +11
Eta Taurids(ETT) - 03:42 (056) +24
Orionids (ORI) - 06:28 (97) +16
Epsilon Geminids (EGE) - 07:02 (105) +27
Leo Minorids (LMI) - 10:43 (161) +36
SPO (sporadics)
----------------------------------------------------------
OBSERVING PERIODS: 0 = none seen; / = shower not observed
PERIOD(UT)___FIELD_____Teff___LM____SPO_ORI_NTA_STA_EGE_LMI_OUI_ETT
04:00-05:00__030 +08___1.00___6.25___6__10___2___4___0___/___0___0
05:00-06:00__048 +09___1.00___6.25___3__12___2___3___1___/___0___0
06:02-06:42__065 +07___0.66___6.25___0___7___2___1___0___1___0___0
TOTALS:________________2.66__________9__29___6___8___1___1___0___0 =
54
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
ORI___0___1___2___5___6___4___7___4_____+2.62
SPO___1___0___0___0___1___4___3___0_____+2.66
STA___0___0___0___0___2___2___3___1_____+3.38
NTA___0___0___0___0___0___3___2___1_____+3.66
EGE___0___0___0___0___0___0___1___0_____+4.00
LMI___0___0___0___0___0___1___0___0_____+3.00
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: None
Breaks (UT): 6:00-02
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