NGC 659

NGC 659 , also known as the Yin-Yang Cluster^[4] is an open cluster in the Cassiopeia constellation. It was discovered by Caroline Herschel in 1783.^[2] It was later described by William Herschel as "A beautiful cluster of pretty large stars near 15' diameter considerably rich".^[5] It is located in the sky almost directly next to NGC 663.

Rightascension01^h 44^m 04^s[1]

Declination+60° 40′^[1]

Distance8.2 kly^[2]

Apparent magnitude(V)7.9^[1]

Quick facts Observation data (J2000.0 epoch), Right ascension ...

NGC 659
NGC 659 along with IC 166, NGC 654, and NGC 663
Observation data (J2000.0 epoch)
Right ascension	01h 44m 04s[1]
Declination	+60° 40′[1]
Distance	8.2 kly[2]
Apparent magnitude (V)	7.9[1]
Apparent dimensions (V)	6.0′[3]
Physical characteristics
Mass	105 to 106 M☉
Radius	7.5[2]
Estimated age	20my[2]
Other designations	NGC 659, Cr 19, OCL 332
Associations
Constellation	Cassiopeia
See also: Open cluster, List of open clusters

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