| NGC 225 | |
|---|---|
 NGC 225 in Cassiopeia | |
| Observation data (J2000 epoch) | |
| Right ascension | 00h 43.7m [1] |
| Declination | +61° 47′[1] |
| Distance | 2200 ly (676 pc[2]) |
| Apparent magnitude (V) | 7.0[1] |
| Apparent dimensions (V) | 12 arcminute |
| Physical characteristics | |
| Image | |
| Other designations | Cr 7, C 0040+615 |
| Associations | |
| Constellation | Cassiopeia[3] |
NGC 225 is an open cluster in the constellation Cassiopeia. It is located roughly 2,200 light-years from Earth. It is about 100 to 150 million years old.[2]
The binary fraction, or the fraction of stars that are multiple stars, is 0.52.[2]
At the 2022 Eldorado Star Party amateur astronomer Will Young, a member of the Astronomical Society of South East Texas, dubbed this open cluster to feature the “Halloween Cat” asterism. A subgroup of brighter stars in this cluster appear to delineate a cat with forward facing eyes, arched back, and raised tail.
- ^ a b c "NGC 225". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2006-05-29.
- ^ a b c Yalyalieva, L.; Carraro, G.; Glushkova, E.; Munari, U.; Ochner, P. (2022). "The young Galactic cluster NGC 225: Binary stars' content and total mass estimate". Monthly Notices of the Royal Astronomical Society. arXiv:2204.12558. doi:10.1093/mnras/stac1199.
- ^ R. W. Sinnott, ed. (1988). The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer. Sky Publishing Corporation and Cambridge University Press. ISBN 978-0-933346-51-2.