| NGC5605 | |
| Constellation Name: | Libra |
| Epoch: | J2000 |
| Type: | (R')SAB(rs)c pec?[1] |
| Dist Ly: | NaNMpc |
| Z: | 0.011294 |
| H Radial V: | 3386 ± 3 km/s |
| Appmag V: | 12.3 |
| Size: | ~36.5kpc (estimated) |
NGC5605 is an intermediate spiral galaxy in the constellation of Libra. Its velocity with respect to the cosmic microwave background is 3635 ± 18km/s, which corresponds to a Hubble distance of NaNMpc. In addition, three non redshift measurements give a distance of NaNabbr=onNaNabbr=on.[2] The galaxy was discovered by German-British astronomer William Herschel on 11 May 1784.[3]
The SIMBAD database lists NGC5605 as 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]
NGC5605 is the only galaxy known where three supernovae were visible at the same time.[5] [6] The first was SN2022bn (typeIb, mag. 18.6),[7] discovered on 5 January 2022. The second supernova, SN 2022ec (typeII, mag 18.8),[8] was reported on 7 January. The third, SN 2022pv (typeII, mag 19.1),[9] was discovered on 13 January.