The 74% illuminated waning gibbous Moon will occult (cover) the magnitude +2.1 star Nunki (Sigma Sagittarii) for observers in the vicinity of the North Pacific Ocean during the morning of Saturday 2021 MAY 01. This will occur predawn in Hawaii and southwest Alaska. It will be a daylight event for folks in much of the rest of western North America.

The immersion will occur on the lunar bright limb, with emersion from the dark limb. Lucky observers in Alaska on the northern graze path can witness the star passing through lunar hills and valleys. Those between of the two graze paths will see a full occultation.

Iíve created a North Pacific Ocean graze map, a set of Besselian elements for computer input, and a preview graphic with data for Honolulu. They can be seen by visiting my Occultations webpage at

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.