“What I was refering to is that the important parameters (whch you listed as: star mag, mag drop, and event duration) can be derived from a pre-agreed SNR for a high quality events.”

Yes, I did expect this is what you intended. ?But I am concerned about using SNR as a method of evaluating the quality of an event.? First, occultations must be evaluated as a light curve rather than a single photometric measures.? ?SNR doesn’t carry enough information to determine the reliability of an event detection.? The event duration and mag drop are critical factors as well.? A low SNR event can yield a reliable detection if the event is very long or the mag drop very large.? My second concern is just a personal preference.? I prefer to define “soft” boundaries for these filters – to allow for differences in how observers make the trade-off between the various parameters of an occultation.? For example, some people might be more willing to chase a short duration event.? So I prefer to setup filters which will include “too many” events rather than too few.? In general, I favor an approach that recognizes the complexity of these events and the variations in how observers approach the decision.? Yes, we could start with SNR and derive a filtering algorithm from the various event attributes.? But I am concerned it won’t work for some people.? If you like the idea of working on an SNR algorithm, that is great.? But, to the extent that it matters, I don’t see much benefit in this approach and would only use the basic event criteria.? Based on my past experience, basic event criteria have always been sufficient.

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“Unfortunately these are all location related parameters and cannot be applied at OWC level for tagging. Along the path of the same event observers will have different star altitudes and twilight. So again OW will be doing the filtering for this. ”

My mistake. You are correct about the location dependence for these attributes.? But it could be useful to include “maximum star altitude”.? I often cull events because the star is low altitude everywhere along the path.

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Thanks

Steve