NGC 1781
Galaxy in the constellation Lepus
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NGC 1781 is a lenticular galaxy in the constellation of Lepus. Its velocity with respect to the cosmic microwave background is 4,998±29 km/s, which corresponds to a Hubble distance of 240.4 ± 17.0 Mly (73.71 ± 5.20 Mpc).[1] It was discovered by German-British astronomer William Herschel on 6 February 1785.[2][3] 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.[3]
| NGC 1781 | |
|---|---|
NGC 1781 imaged by Legacy Surveys | |
| Observation data (J2000 epoch) | |
| Constellation | Lepus |
| Right ascension | 05h 07m 55.0376s[1] |
| Declination | −18° 11′ 23.373″[1] |
| Redshift | 0.016645±0.0000970[1] |
| Heliocentric radial velocity | 4,990±29 km/s[1] |
| Distance | 240.4 ± 17.0 Mly (73.71 ± 5.20 Mpc)[1] |
| Apparent magnitude (V) | 13.69[1] |
| Characteristics | |
| Type | (R)SB0^0(s) pec[1] |
| Size | ~150,400 ly (46.10 kpc) (estimated)[1] |
| Apparent size (V) | 1.3′ × 1.1′[1] |
| Other designations | |
| ESO 553- G 007, IRAS 05057-1815, 2MASX J05075502-1811237, NGC 1794, MCG -03-14-002, PGC 16788[1] | |
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.[4][5]
