| ESO 198-13 | |
|---|---|
Ring galaxy ESO 198-13.
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| Observation data (J2000 epoch) | |
| Constellation | Eridanus |
| Right ascension | 02h29m 16.1s[1] |
| Declination | −48° 29′ 29″[1] |
| Redshift | 0.018186/5452 km/s[1] |
| Distance | 237,147,400 ly |
| Apparent magnitude (V) | 13.64 |
| Characteristics | |
| Type | (R')SA(r)ab[1] |
| Size | ~162,773 ly (estimated) |
| Apparent size (V) | 1.7' x 1.2[1] |
| Notable features | Multiple-ringed Hoag-type galaxy |
| Other designations | |
| PGC 9463 [1] | |
ESO 198-13 is a ring galaxy with multiple ring-like structures[2] located about 240 million light-years away[3] in the constellation Eridanus.[4]
This galaxy has three ring structures. There is a small bright inner ring located close to the nucleus. This feature has been interpreted as a nuclear ring due to being similar to the nuclear rings in a barred spiral galaxy (e.g. NGC 1512, NGC 4314). Also this ring has a diameter of 15,527.12 light-years (4.76 kpc) which is larger than the average diameter of a nuclear ring (4,893 light-years/1.5 kpc). Surrounding the nuclear ring, a flocculent inner ring with a diameter of 54,801.6 light-years (16.8 kpc) can be found. It appears to be made of a very tightly wound spiral arm. It also could be a superposition of two rings offset from each other. Outside of the flocculent inner ring, there is a very large and faint outer ring with a diameter of 162,773.8 light-years (49.9 kpc).[2]
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