NGC 5605
Galaxy in the constellation Libra
From Wikipedia, the free encyclopedia
NGC 5605 is an intermediate spiral galaxy in the constellation of Libra. Its velocity with respect to the cosmic microwave background is 3635 ± 18 km/s, which corresponds to a Hubble distance of 174.9 ± 12.3 Mly (53.61 ± 3.76 Mpc).[1] In addition, three non redshift measurements give a farther distance of 194.72 ± 0.68 Mly (59.700 ± 0.208 Mpc).[2] The galaxy was discovered by German-British astronomer William Herschel on 11 May 1784.[3]
| NGC 5605 | |
|---|---|
NGC 5605 imaged by Pan-STARRS | |
| Observation data (J2000 epoch) | |
| Constellation | Libra |
| Right ascension | 14h 25m 07.57s[1] |
| Declination | −13° 09′ 46.8″[1] |
| Redshift | 0.011294[1] |
| Heliocentric radial velocity | 3386 ± 3 km/s[1] |
| Distance | 174.9 ± 12.3 Mly (53.61 ± 3.76 Mpc)[1] |
| Apparent magnitude (V) | 12.3[1] |
| Characteristics | |
| Type | (R')SAB(rs)c pec?[1] |
| Size | ~119,000 ly (36.50 kpc) (estimated)[1] |
| Apparent size (V) | 1.5′ × 1.3′[1] |
| Notable features | The only galaxy known to have 3 supernovae visible at the same time |
| Other designations | |
| IRAS 14223-1256, 2MASX J14250757-1309467, MCG -02-37-003, PGC 51492[1] | |
The SIMBAD database lists NGC 5605 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]
Unique Trio of Supernovae
NGC 5605 is the only galaxy known where three supernovae were visible at the same time:[5][6]
