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NGC 2523 is one of several galaxies chosen by Halton Arp as an example of a spiral galaxy that has a separation of one of its arms. It is listed in Arp's Atlas of Peculiar Galaxies as Arp 9.
NGC 2523 group
According to A.M. Garcia, NGC 2523 is the largest and brightest galaxy of the NGC 2523 Group (also known as LGG 154), which contains 5 galaxies, including NGC 2441, NGC 2550A, UGC 4041, and UGC 4199.
Supernova
One supernova has been observed in NGC 2523: SN 2024aeee (type II, mag. 16) was discovered by Shinichi Ono on 17 December 2024.
Garcia, A. M. (1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100: 47. Bibcode:1993A&AS..100...47G.
"SN 2024aeee". Transient Name Server. IAU. Retrieved 19 December 2024.
NGC 2523 (left) next to NGC 2523B (right)![[REDACTED]](https://abc.global.ssl.fastly.net/File:Commons-logo.svg){kind=link}
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