NGC 128

NGC 128 is a lenticular galaxy in the constellation Pisces. It is approximately 190 million light-years from earth and has a diameter of about 165,000 light years. [2]

NGC 128
NGC 128 with smaller galaxies NGC 130 (left) and NGC 127 (right)
Observation data
ConstellationPisces
Right ascension 00h 29m 15.0s[1]
Declination2° 51′ 51″[1]
Redshift4241 ± 16 km/s[1]
Apparent magnitude (V)12.8[1]
Characteristics
TypeS0 pec[1]
Apparent size (V)3′.0 × 0′.9[1]
Other designations
UGC 00292,[1] PGC 1791,[1]

Discovery

NGC 128 was discovered by astronomer William Herschel on 25 December 1790 using a reflecting telescope with an aperture of 18.7 inches. At the time of discovery, its coordinates were recorded as 00h 22m 05s, +87° 54.6′ -20.0″. [3] It was later observed by John Herschel on 12 October 1827.[2]

Visual appearance

The galaxy is described as "pretty bright", "very small" with a "brighter middle". It is approximately 165,000 light years in diameter and is elongated.[4][2] The galaxy is famous for its (peanut shell)-shaped bulge, and in 2016 it was discovered that there are two such nested structures, possibly associated with two stellar bars.[5]

Galaxy group information

NGC 128 is the largest member, and the namesake of, the NGC 128 group which also includes the galaxies NGC 127 and NGC 130. NGC 128 has a strong tidal bridge with NGC 127 and there is evidence of interaction between all three galaxies in the group. NGC 128 has a noticeable peanut shape that is likely to be caused by gravitational effects of the other two galaxies.[6]

  • NGC 128 group with labels
  • NGC 128 group without labels
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See also

References
  1. "NASA/IPAC Extragalactic Database". Results for NGC 128. Retrieved 2016-01-25.
  2. "New General Catalog Objects: NGC 100 - 149". Celestial Atlas. Retrieved 25 January 2016.
  3. "NGC 128". The NGC/IC Project. Archived from the original on 28 May 2009. Retrieved 5 January 2016.
  4. Aranda,Ted (2011). 3,000 Deep-Sky Objects: An Annotated Catalogue. Springer Science & Business Media. p. 54. ISBN 9781441994196.
  5. Bogdan C. Ciambur; Alister W. Graham (2016), Quantifying the (X/peanut)-shaped structure in edge-on disc galaxies: length, strength, and nested peanuts
  6. Jarvis, B (1990). "The NGC 128 Group of Galaxies". Dynamics and Interactions of Galaxies. Springer-Verlag Berlin. pp. 416–417. doi:10.1007/978-3-642-75273-5_104. ISBN 978-3-642-75275-9.
  • Media related to NGC 128 at Wikimedia Commons


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