It has also one of the longest periods, and hence is one of the most luminous in the class. There are still only a few Cepheids with longer periods, including RS Puppis, SV Vulpeculae, and the unusual S Vulpeculae.
This particular star has an exceptionally long orbital period, making it one of the most radiant in its category. A handful of other Cepheids have even longer periods, including RS Puppis, SV Vulpeculae, and the peculiar S Vulpeculae.