Re: Radiants, was Re: (meteorobs) A blank meteor reporting form

To: Mark Davis <MeteorObs@Charlestondot net>, NAMN Meteorobs <meteorobs@latrade.com>
Subject: Re: Radiants, was Re: (meteorobs) A blank meteor reporting form
From: Marco Langbroek <marcolan@stad.dsldot nl>
Date: Sun, 1 Nov 1998 19:31:01 +0000 ()
In-Reply-To: <3.0.5.32.19981031182003.009d5100@hydra.cc.ruudot nl>
Reply-To: meteorobs@latrade.com
Sender: owner-meteorobs

Hi,

In observing, never use these very thight radiant diameters. With direct 
classification you simply cannot determine the radiant direction of the 
observed meteor that precise, and with plotting, always expect some 
deviations (a few degrees in direction can make for several degrees in 
diameter).
These very thight radiant diameters are only usefull when you can 
determine radiants with photographic precision.

In general, I feel that IMO's recommended diameters are very usefull 
except perhaps that in a few occasions they suggest very large diameters 
for meteors far from the radiant. Observing not too far from the radiant 
(say 30-90 degrees, with plotting I usually allow for some 5-10 degrees 
diameter, sometimes slightly larger with known diffuse streams.

- Marco Langbroek

References:

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