Subj : Stargazing News - July 27th, 2025
To   : All
From : CJ
Date : Sat Jul 26 2025 07:00 am

Sunday July 27, 2025 

The Tweedledum and Tweedledee Clusters (all night) 

Aim binoculars halfway between Altair and the star Celebrai in Ophiuchus and
look for a pair of bright, magnitude 4.6 open star clusters straddling the
border between Serpens and Ophiuchus. Since their centres are separated by
nearly 3 degrees, the duo will nicely fill your binoculars' field of view -
like a southerly version of the Double Cluster in Perseus. The smaller, more
westerly cluster NGC 6633, dubbed Tweedledum, contains more than 50 prominent
stars arranged in loose clumps stretching NE-SW across 30 arc-minutes of sky.
The larger, easterly cluster is named Graff's Cluster or IC 4756 - but I
prefer Stephen O'Meara's suggested moniker of Tweedledee. A rich core of 70 or
more magnitude 9 stars distributed in pairs and clumps sits inside a 1-degree-
wide circlet of magnitude 6-8 stars. Can you detect the dark dust region to
the east of these "twins"?

(Data courtesy of Starry Night)
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 * Origin: CJ's Place, Orange City FL > cjsplace.thruhere.net (21:2/156)

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