- Constellation: Cassiopeia
- Right Ascension: 23h 57m 24s
- Declination: +56° 42′ 30″
- Distance: 7,600 ly
NGC 7789 is an open cluster in Cassiopeia. Often called Caroline's Rose or The White Rose. It was discovered by Caroline Herschel in 1783. The cluster lies at a distance of 7600 light years away. I was curious about the particularly red bright star at the 2 o'clock position from the cluster. It is a red giant variable star of the Mira class, and its designation is WY Cas. In an approximately 476 day cycle, it varies from magnitude 16.9 up to a brightness of magnitude 10. It is near the peak in brightness in its cycle, but has no recent observations of its exact magnitude.
- Details
- Category: Open Clusters
- Telescope: EDT 80mm Reftactor
- Camera: Atik 314l+