ESO 198-13

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]

ESO 198-13
Ring galaxy ESO 198-13.
Observation data (J2000 epoch)
ConstellationEridanus
Right ascension 02h 29m 16.1s[1]
Declination−48° 29′ 29″[1]
Redshift0.018186/5452 km/s[1]
Distance237,147,400 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 featuresMultiple-ringed Hoag-type galaxy
Other designations
PGC 9463 [1]

Physical Characteristics

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 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 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]

gollark: Another fun thing to do would be to make it work out the correct location of the device pinging stuff, then deliberately offset the coordinates you supply to make it think it's somewhere else.
gollark: It's called livEGPS.
gollark: I did this ages ago for ironic purposes.
gollark: So incorrect ones? Great*!
gollark: Strings on the GPS channel? This will do nothing whatsoever.

See also

References
  1. "NASA/IPAC Extragalactic Database". Results for ESO 198-13. Retrieved 2017-07-27.
  2. Grouchy, R. D.; Buta, R. J; Salo, H.; Laurikainen, E. (3 May 2010). "RING STAR FORMATION RATES IN BARRED AND NONBARRED GALAXIES". The Astronomical Journal. 139 (6): 2465–2493. arXiv:1004.5063. doi:10.1088/0004-6256/139/6/2465.
  3. "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2017-07-27.
  4. "Principal Galaxy Catalog (PGC) Objects 9000 - 9499". cseligman.com. Retrieved 2017-07-27.
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