NGC 225

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]

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]
See also: Open cluster, List of open clusters

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.

See also

• Open cluster
• List of NGC objects (1–1000)
• Cassiopeia (constellation)

References

1. "NGC 225". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2006-05-29.
2. 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.
3. 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.

External links

• Media related to NGC 225 at Wikimedia Commons
• NGC 225 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
• SEDS