The waxing nearly Half Moon will occult (cover) the magnitude +3.8 star Omicron Sagittarii for observers in North America during the evening of Monday 2018 OCT 15. For Chicagoland observers, an unusual 13-month drought will follow for nighttime lunar occultations of planets and stars brighter than magnitude +4.1.

The current series of 19 monthly Omicron Sagittarii occultations extends from 2018 JUN 01 to 2019 OCT 05. However the large majority are not visible at nighttime from any particular location. The next series will commence on 2028 OCT 23.

The upcoming immersion will occur on the lunar dark limb and emersion on the bright limb. Observers on a graze path will witness the star winking on and off as lunar hills and valleys pass by. Those between the two paths will see a full occultation.

Iíve created a graze map for North America, a set of Besselian elements for computer input, and preview graphics with data for Chicago. They can be seen by visiting my Occultations webpage at https://www.CurtRenz.com/occultations.html

Photos and descriptions of the occultation would be welcome additions to this thread. If you would like specific occultation or graze predictions for your location, please reply to this post with your longitude, latitude, elevation and time zone.