Best of AOP - Star Clusters

NGC 457: The "ET" Cluster

NGC 457 is an open cluster located in the constellation Cassieopeia. It is easily found in small telescopes, and a favorite for amateur astronomers who can imagine the nicknames of Owl Cluster and ET. The two bright stars in the upper left make up the eyes of ET.

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Last Updated: 25-Jun-2014

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About This Image

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20in RC Optical Systems telescope Operating at f/5.5

Paramount ME Robotic Telescope Mount

SBIG ST10XME CCD camera with color filter wheel

LRGB color production was used to create this image.

Luminance = RGB (synthetic) binned 1x1

Red = 6 minutes binned 1x1

Green = 6 minutes binned 1x1

Blue = 6 minutes binned 1x1

Minimum credit line: Ken and Emilie Siarkiewicz/Adam Block/NOAO/AURA/NSF