A showers rating is a measurement of its strength and reliability. The 4 classes are described below:
I - The strongest annual showers with ZHR's always above 10 at maximum activity.
II - Dependable minor showers with ZHR's of a least 3 at maximum activity.
III - Showers with irregular rates. The display may be strong one year and totally absent the next.
IV - Weak minorshowers that are difficult to separate from the sporadic
background. These showers are best left to the most experienced observers who use plotting and velocity to determine a meteors
DMS - Dutch Meteor Society
IMO - International Meteor Organization
Lunsford - Association of Lunar & Planetary Observers
This page is a copy due to performance
original page can be found here.