| ESO 198-13 | |
| Epoch: | J2000 |
| Type: | (R')SA(r)ab[1] |
| Dist Ly: | 237,147,400 ly |
| Z: | 0.018186/5452 km/s |
| Appmag V: | 13.64 |
| Constellation Name: | Eridanus |
| Size V: | 1.7' x 1.2 |
| Names: | PGC 9463 |
| Notes: | Multiple-ringed Hoag-type galaxy |
| Size: | ~162,773 ly (estimated) |
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).