[1] The supermassive black hole at the core has a mass of (4.4±0.5)×107 M☉.

[4] The black hole was discovered by analyzing the dynamics of the galaxy.

[5] NGC 1023 is included in Halton Arp's Atlas of Peculiar Galaxies, under the category "Galaxies with Nearby Fragments" under the number 135.

[6] NGC 1023 has been estimated to have about 490 globular clusters, consistent with similar early-type galaxies.

"[7] NGC 1023 has a satellite galaxy named NGC 1023A, which is a Magellanic spiral galaxy; its globular cluster system is much smaller, estimated to be around six individuals.