(meteorobs) Observation July 30/31 2003

On the Thursday morning July 31, I went to the Casselman site to 
enjoy some very steady views of Mars in my 14.5" dobsonian.  Upon 
arriving just after midnight, I was greeted by about a dozen 
observers who were already enjoying great views of Mars.  This planet 
is quite a sight even just with the naked eyes.  Through the 
telescope, the details were wonderful.

Before morning dawn, I also a short one-hour meteor session.  The 
skies were clear and it was a very comfortable night to observe.

I recorded 26 meteors.  The Perseids and South Delta Aquarids were 
most active of the showers with 7 members each.  There was also a 
good number of north apex sporadics producing some very swift and 
trained streaks.

Most meteors seen this morning were on the rather faint side.

Pierre Martin
Ottawa, Ontario

DATE: July 30/31 2003
BEGIN: 0628 UT (0228 EST)  END: 0745 UT (0345 EST)
OBSERVER: Pierre Martin (MARPI)
LOCATION: Long: -75.063 West; Lat: 45.269 North  Elevation: 50m
City & Province: Casselman, Ontario, CANADA
RECORDING METHOD: talking clock/tape recorder, cord align method

OBSERVED SHOWERS:_______________________________________radiant position
		CAP (Alpha Capricornids)_______________________2020 -11
		NDA (North Delta Aquarids)_____________________2140 -08
		SDA (South Delta Aquarids)_____________________2236 -17
		PAU (Pisces Austrinids)________________________2240 -30
		ACG (Alpha Cygnids)____________________________2040 +49
		PER (Perseids)_________________________________0140 +54
		ANT/SIA (sporadics from the antihelion)________2116 -15
		NPX (sporadics from the north apex)____________0216 +28
		SPX (sporadics from the south apex)____________0216 -02
		SPO (random sporadics)

OBSERVING PERIODS: 0 = none seen;  / = shower not observed


0628-0745__2255+08__1.03__6.35____7___1___0___0___0___7___0___5___1___5 = 26

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.




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.


Corresponding F value: 1.00 for entire session

Dead time: 15 minutes

Breaks (UT):  0711 (60sec), 0726-0740

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