NGC 5597
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| NGC 5597 | |
|---|---|
 NGC 5597 imaged by Legacy Surveys | |
| Observation data (J2000 epoch) | |
| Constellation | Libra |
| Right ascension | 14h 24m 27.4115s[1] |
| Declination | −16° 45′ 46.598″[1] |
| Redshift | 0.009030±0.0000170[1] |
| Heliocentric radial velocity | 2,707±5 km/s[1] |
| Distance | 125.90 Mly (38.600 Mpc)[1] |
| Group or cluster | HOLM 638, VV 446 |
| Apparent magnitude (V) | 12.60[1] |
| Characteristics | |
| Type | SAB(s)cd[1] |
| Size | ~83,900 ly (25.73 kpc) (estimated)[1] |
| Apparent size (V) | 2.1′ × 1.7′[1] |
| Other designations | |
| HOLM 638B, IRAS 14216-1632, 2MASX J14242744-1645457, MCG -03-37-002, PGC 51456, VV 446 NED02[1] | |
NGC 5597 is an intermediate spiral galaxy in the constellation of Libra. Its velocity with respect to the cosmic microwave background is 2,956±18 km/s, which corresponds to a Hubble distance of 142.2 ± 10.0 Mly (43.59 ± 3.06 Mpc).[1] However, one non-redshift measurement gives a much closer distance estimate of 125.90 Mly (38.600 Mpc).[2] It was discovered by German-British astronomer William Herschel on 14 May 1784.[3][4]
NGC 5597 is a Seyfert I 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.[5][6]
NGC 5597 and NGC 5595 are listed together as Holm 638 in Erik Holmberg's A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems, published in 1937.[7] The two galaxies are also listed together as VV 446 in part II of the Atlas and Catalogue of Interacting Galaxies.[8]
Supernovae
Two supernovae have been observed in NGC 5597:
