Tweedledee and Tweedledum Open Clusters (YC Lim)

Celestial hemisphere: Northern · Constellation: Serpens (Ser) · Contains: IC 4756 · NGC 6633 · The star 4Aql · The star 74Oph

Tweedledee and Tweedledum Open Clusters, YC Lim

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Tweedledee and Tweedledum Open Clusters

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Tweedledee and Tweedledum Open Clusters

An open cluster is a group of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age.

NGC 6633 (top) lies in the direction of the Ophiuchus spur part of a spiral arm in the constellation of Ophiuchus. Residing around 1200 light years distant, NGC 6633 lies in a very rich star field, and is nearly as large as the full moon, but is relatively sparse. The cluster contains 52 stars giving a total magnitude of 4.6; the brightest star being of mag 7.6.

Just 3° East of NGC 6633 residing in the “Cauda” or tail part of the constellation Serpens, lies the almost equally bright, but larger open cluster IC 4756 (bottom). Visually the group is enclosed within a large trapezoid of up to 80 magnitude 5-7 stars, with many pairs and clumps in the central portions. The cluster lies approximately 1300 light years away and is a similar age to NGC 6633.

Both NGC 6633 and IC 4756 are sometimes referred to as the Tweedle-Dum and Tweedle-Dee clusters due to their proximity in the sky. In Lewis Carroll's classic children's book "Through the Looking Glass and What Alice Found There", it describes Alice's encounter with the "fat little," pugilistic twins called Tweedledum and Tweedledee. The twins' names have become synonymous with any two people, places, or things worthy of comparison.

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	Image of the day	Top pick	Top pick nominations	Total submitted
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Tweedledee and Tweedledum Open Clusters

Tweedledee and Tweedledum Open Clusters

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Tweedledee and Tweedledum Open Clusters

Tweedledee and Tweedledum Open Clusters

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