NGC 128

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
NGC 128
N125s.jpg
NGC 128 (upper left) and NGC 125 (lower middle)
Observation data
Constellation Pisces
Right ascension 00h 29m 15.0s[1]
Declination 2° 51′ 51″[1]
Redshift 4241 ± 16 km/s[1]
Apparent magnitude (V) 12.8[1]
Characteristics
Type S0 pec[1]
Apparent size (V) 3′.0 × 0′.9[1]
Other designations
UGC 00292,[1] PGC 1791,[1]
See also: Galaxy, List of galaxies

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]

Discovery[edit]

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[edit]

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[edit]

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]

See also[edit]

References[edit]

  1. ^ a b c d e f g h "NASA/IPAC Extragalactic Database". Results for NGC 128. Retrieved 2016-01-25. 
  2. ^ a b c "New General Catalog Objects: NGC 100 - 149". Celestial Atlas. Retrieved 25 January 2016. 
  3. ^ "NGC 128". The NGC/IC Project. 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. 

Coordinates: Sky map 00h 29m 15.0s, +02° 51′ 51″