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View Full Version : Moon Occults Mu Geminorum - March 13



Centaur
2011-Mar-08, 10:18 PM
The 61% illuminated waxing gibbous Moon will occult magnitude +2.9 Mu Geminorum for North American observers during the afternoon and evening of 2011 MAR 13. This will be an evening event only for those in the eastern portion of the continent. For those of us in Chicagoland, immersion will take place before sunset and emersion after sunset.

Observers on a graze path will be able to witness the star winking on and off as lunar hills and valleys pass by. Those between the graze paths will see a full occultation. Immersion will generally occur on the lunar dark limb, while emersion should come from the bright limb. The star’s apparent equatorial coordinates at the time of the event will be RA 06:23:39.9 and Dec N 22°30’24”.

I’ve created a graze map for North America. and a preview graphic with data for observers at Chicago’s Adler Planetarium. They can be seen by clicking http://www.curtrenz.com/moon

Photos and descriptions of the event would be welcome additions to this thread. If you would like occultation or graze data specifically for your location, then please reply to this post with a longitude, latitude, time zone and altitude above sea level.

LoneTree1941
2011-Mar-12, 06:53 PM
Thank you for your fine offer Centaur; could you please provide data for 39 deg 14 min N. latitude; 086 deg 38 min W. longitude; EDST at 780-ft elev?

Centaur
2011-Mar-12, 07:18 PM
Thank you for your fine offer Centaur; could you please provide data for 39 deg 14 min N. latitude; 086 deg 38 min W. longitude; EDST at 780-ft elev?

Sure, LoneTree1941. As is the case for Chicago, immersion will occur while the Sun is still above the horizon, but emersion will occur after sunset. If anything doesn’t make sense in the graphic, don’t hesitate to let me know.

http://www.curtrenz.com/OC110313B.JPG