| NGC 659 | |
|---|---|
 | |
| 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 |
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.
