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Re: (meteorobs) Re: coeff.
In a message dated 8/18/2001 3:00:38 PM Eastern Daylight Time,
marco.langbroek@wanadoodot nl writes:
<< Actually, the probability function often used to correct magnitude
distributions are employed because of the observer missing increasing
numbers of fainter meteors and thus are a measure of how much are missed.
Such probability functions are derived either by comparing simultanious
observations of observers, or by means of "DCV" (Distance from Center of
Vision) estimates for a large number of meteors.
Below factors were derived by Peter Jenniskens from DCV estimates by Dutch
DMS observers, and come from his 1994 Astron. & Astroph. paper (A&A 287,
990-1013). They give you an idea of the fraction of meteors which is
typically seen (and the balance missed) for several magnitude classes (and
Lm at +6.5). Note that these are something of an average, in reality they
will be observer dependant:
-2 0.75
-1 0.73
0 0.70
+1 0.63
+2 0.48
+3 0.32
+4 0.09
+5 0.009
+6 0.001
These data indicate that the typical observer sees only a 0.009 fraction of
the magnitude +5 meteors appearing and hence misses 99% of them.
>>
Marco:
Fascinating.
Bob Young
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