It reached a peak brightness of magnitude 5.449 on May 9, 2021, making it visible to the naked eye.

[4] It was discovered by Japanese amateur astronomer Yuji Nakamura of Kameyama, Japan, at 10:10 UT on March 18, 2021.

[7] After the seven month long series of peaks, Nova Cassiopeiae began a linear decline in brightness.

[10] The ejecta from FE II novae is believed to come from a large circumbinary envelope of gas (which was lost from the donor star), rather than the white dwarf.

[11] TESS observations revealed an orbital period of 4.52138±0.00012 hours for the binary system.