NGC 1781 is a lenticular galaxy in the constellation of Lepus. Its velocity with respect to the cosmic microwave background is , which corresponds to a Hubble distance of . It was discovered by German-British astronomer William Herschel on 6 February 1785. It was also observed by American astronomer Ormond Stone on 11 December 1885, causing it to be listed a second time in the New General Catalogue as NGC 1794.
NGC 1781 is a Seyfert II galaxy, i.e. it has a quasar-like nucleus with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.
Supernova One supernova has been observed in NGC 1781: SN 2025yrt (TypeII, mag. 16.1) was discovered by ASAS-SN on 26 September 2025.
See also List of NGC objects (1001–2000)
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