(meteorobs) Observation November 13/14 2004
Pierre Martin
dob14.5 at sympatico.ca
Wed Nov 17 23:18:52 EST 2004
Here's my report for the meteor observing portion of last Saturday
night at Bootland Farm. Under clear skies of below-average quality
transparency, the limit magnitude was 6.3. Low to the North, a weak
but interesting aurora was visible. The temperature went well below
freezing with some frost, so it was nice to bundle up in my sleeping
bag.
In the two hours of viewing centered on local midnight, I recorded 29
meteors. It was an interesting session with Taurids, and some early
Leonids making an appearance. My plots clearly confirm these.
The first Leonid seen just one minute before local midnight was an
impressive 50 degrees long earthgrazer! It was quite a sight even if
the meteor never got any brighter than mag +3. The other Leonid, seen
about 20 minutes later was a mag 0 vivid *GREEN* meteor that streaked a
long path into Eridanus and left a nice 3 sec train.
Another memorable meteor was a beautiful almost-pure-white South Taurid
of mag -2 that went a long 20 degrees in Andromeda.
Here's hoping for more clear skies to enjoy some Leonids,
Pierre Martin
Ottawa, Ontario
DATE: November 13/14 2004
BEGIN: 0350 UT (2250 EDT) END: 0605 UT (0105 EDT)
OBSERVER: Pierre Martin (MARPI)
LOCATION: Long: -76 29' West; Lat: 45 23' North Elevation: 400 ft
City & Province: Bootland Farm, Ontario, CANADA
RECORDING METHOD: talking clock/tape recorder, cord align
-----------------------------------------------------------------------
OBSERVED SHOWERS:_____________________________________radiant position
ERI (Delta Eridanids)__________________________03:48 -02
ANT (antihelions, North and South Taurids)_____04:28 +22
AMO (Alpha Monocerotids)_______________________07:28 +02
LEO (Leonids)__________________________________10:00 +23
NPX (sporadics from north apex)________________09:28 +29
SPX (sporadics from south apex)________________09:28 -01
SPO (random sporadics)
-----------------------------------------------------------------------
OBSERVING PERIODS: 0 = none seen; / = shower not observed
PERIOD(UT)_FIELD____Teff__LM_____NTA_STA_ERI_AMO_LEO_NPX_SPX_SPO
0350-0453__0330+12__0.99__6.34____1___2___0___0___0___0___/___7
0453-0605__0524+17__1.00__6.35____2___4___1___0___2___2___/___8
TOTALS:_____________1.99__________3___6___1___0___2___2___/___15 = 29
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). The next column (LM) is the average naked eye limiting
magnitude, determined by triangle star counts. All following columns
indicate the number of meteors for each shower observed.
------------------------
MAGNITUDE DISTRIBUTIONS:
SHOWER
_______-2__-1___0__+1__+2__+3__+4__+5______AVE
STA_____1___0___0___0___0___3___2___0_____+2.50
NTA_____0___0___0___1___0___0___1___1_____+3.33
LEO_____0___0___1___0___0___1___0___0_____+1.50
ERI_____0___0___0___0___0___1___0___0_____+3.00
SPO_____0___0___2___0___3___8___2___2_____+2.82
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 (FOV): None
------------------------
Dead time: 15.83 min total (including 14 min for plots)
Breaks (UT): 4:52 (30sec), 5:02 (30sec), 5:52 (20sec), 5:56 (30sec)
-------------------------
More information about the Meteorobs
mailing list