Open star cluster in the constellation Cassiopeia

NGC 659

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All data from the card 10

Right ascension: 01h 44m 04s
Declination: +60° 40′
Distance: 8.2 kly
Apparent magnitude (V): 7.9
Apparent dimensions (V): 6.0′
Mass: 105 to 106 M☉
Radius: 7.5
Estimated age: 20my
Other designations: NGC 659, Cr 19, OCL 332
Constellation: Cassiopeia

NGC 659, also known as the Yin-Yang Cluster, is an open cluster in the constellation Cassiopeia. It was discovered by Caroline Herschel in 1783. It was later described by William Herschel as "A beautiful cluster of pretty large stars near 15' diameter considerably rich". It is located in the sky almost directly next to NGC 663.

NGC 659

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