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(meteorobs) Plotting: Three Stooges Method
Hello All,
As part of my continuing education in meteor observation, I
have slowly been working my way into plotting. I must admit, never have
I found anything that seemed so deceptively simple to be so
confoundingly frustrating. A typical attempt at plotting a single
meteor may go something like this:
5:40 UT, a meteor appears that *may* be coming from a known
radiant. I decide to plot it. I throw my ruler up into the air to
"place" the path.
5:40:30, I feel I have the path, now I need to see the time. I
grope for my recorder, finally find the pause button, while still
holding the ruler to the sky. I look down at the watch glued to the
recorder. I look back up, and I no longer have the ruler placed exactly
where it should be. I place it back where I think it should be.
5:41:30 I stare and stare and stare at that region of the sky and
finally realize the meteor was over the peak of Ophiuchus.
I cautiously put the ruler down and reach for my red light and charts.
I turn on the red light, and in order to free up my hands for plotting,
hold the light in my mouth. I get stung on the tongue by an ant. I
spit the ant and several grains of sand out, then return to the chart.
5:42:30 An outburst of 15 simultaneous meteors occur while I am
staring down at my charts. By now I can't remember
which direction the meteor was traveling, or what the beginning and end
point was, if I ever had them well to begin with. I "plot" the meteor
just as the cat jumps on my lap and all my tools get scattered.
5:43:30 A magnitude -7 fireball appears while I am looking down to
gather up my pencil, chart, ruler and recorder. My chewing gum, I
notice, is quite gritty with sand now.
And that was an EASY one! Actually, most of the meteors appear
within my field of view, and go quickly on the chart I have out and I
don't really lose that much time. But the most frustrating thing of
all, I think is getting home and not being able to accurately predict
the radiant drift for various minor shower radiants due to the
inadequacies of my charts. I still don't know what one grid on the
Atlas Bruno chart represents, in degrees, and my Petersons charts have
the RA and dec, but I can't translate that well into actual degrees.
So a few questions: If I hold my 12" ruler to the sky at arms
length, how many degrees of sky am I covering? It is approximately the
distance from Deneb to Altair. I know the rule of thumb about fist size
being 10 degrees and open hand being about twenty, but there can be a
wide variation there among individuals.
Also, do I need to join a guild or a lodge to get the secret
information contained within those plotting charts? If I could
accurately measure distance on those charts, I wouldn't have to
aggravate Mark, Wayne, and others for current radiant positions. Or is
there some easier way that I'm missing altogether? (Wayne, I didn't get
the current Piscid position:>)
But until I started plotting, I never realized I had so many thumbs.
Thanks in Advance, Kim S. Youmans
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