International Occultation and Timing Association
The International Occultation Timing Association (IOTA) was established to encourage and facilitate the observation of occultations and eclipses. IOTA membership benefits include: A subscription to Occultation Newsletter (ON), which gives news of meetings, predictions, software, observing techniques and equipment, and results for solar eclipses and lunar occultations as well as for asteroidal occultations. An annual ON Supplement includes detailed finder charts and information about the 50 best asteroidal occultations visible from North America; similar supplements are available for other parts of the world as well. Members also can receive lunar occultation predictions for their location, detailed grazing occultation predictions for paths that cross their region, and local circumstance (time and distance of closest approach, and alt. and az. of the Sun, Moon, and star) predictions for asteroidal appulses that produce occultations somewhere in the world (considering 200 to 300 of the best events per year) and occur above your horizon at night (and day for stars brighter than 6th mag.).