(meteorobs) [Meteorobs] ZHR Table

[meteors at comcast.net]

Hi Rainer,

Thanks for catching this...the mistake has escaped detection for quite 
some time!! I will review that section once the Orionid period is behind 
us....

Mark Davis, South Carolina, USA
meteors at comcast.net
namn at namnmeteors.org

North American Meteor Network
http://www.namnmeteors.org


Rainer Arlt wrote:
>> HR = observed hourly rate; r = population index; LM = your average limiting 
>> magnitude; and A = altitude of the shower's radiant above the horizon in 
>> degrees
>>
>> a) Formula with an LM above 6.5
>>
>>        (HR) (r)^1-(LM - 6.5)
>> ZHR = ----------------------
>>               Sine A
>>
>> b) Formula with an LM below 6.5
>>
>>         (HR) (r)^6.5-LM
>> ZHR = -------------------
>>              Sine A
> 
> The "above 6.5" formula looks suspicious to me.
> Does it actually mean, if LM=7.0, that the
> correction is r^(1-0.5) = r^0.5 ? If I am not mis-
> interpreting the symbols, it is wrong.
> 
> The one and only formula is the second one
>>         (HR) (r)^(6.5-LM)
>> ZHR = -------------------
>>              Sine A
> 
> where I have put brackets to make clear the the difference
> is taken before the power. At an LM of 7.0, we get
> r^(-0.5) which is a number smaller than one. This is
> what we want, since an observer with 7.0 sees more meteors
> than the "standard" observer at 6.5. Hence the observed
> number of meteors is corrected downwards.
> 
> Best regards,
> Rainer
> 
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