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The Hubble Image of M13

(And How it Became a Snowglobe!)

In November 1999 and April 2000, M13 was imaged in visible and infrared filters using Hubble's WFPC2 detector.

In August 2005 and April 2006, the higher-resolution ACS detector was used to image the globular in blue, visible and infrared filters. Slightly longer exposure times combined with higher resolution of ACS resulted in CCD bleeds of the brightest stars.


Click on images for larger view.

By combining together the data from both detectors, we were able to have non-bleeding bright stars with very high resolution faint stars.

Combining the fields of view also resulted in a larger area of coverage in our final image.

A circle representation allowed for the maximum amount of the globular to be visible. Although the outer edges of the cluster go far outside our image, it is noticible how there is more of a concentration in the center of the cluster and a soft gradient where the density of stars begins to diminish.