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NGC 128 is a lenticular galaxy in the constellation Pisces. It is approximately 190 million light-years from the Sun 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 (J2000 epoch)
ConstellationPisces
Right ascension00h 29m 15.047s[1]
Declination+02° 51′ 50.60″[1]
Redshift0.01466[1]
Helio radial velocity4363 km/s[1]
Distance190 Mly (58 Mpc)[2]
Apparent magnitude (V)11.63[3]
Apparent magnitude (B)12.65[3]
Characteristics
TypeS0[1]
Other designations
UGC 292, MCG +00-02-051, 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″.[4] 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.[5][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.[6]


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.[7]



  • NGC 128 group with labels
    NGC 128 group with labels
  • NGC 128 group without labels
    NGC 128 group without labels

See also



References


  1. "NGC 128". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-02-12.
  2. "New General Catalog Objects: NGC 100 - 149". Celestial Atlas. Retrieved 25 January 2016.
  3. "Search specification: NGC 128". HyperLeda. Université Claude Bernard Lyon 1. Retrieved 2021-02-12.
  4. "NGC 128". The NGC/IC Project. Archived from the original on 28 May 2009. Retrieved 5 January 2016.
  5. Aranda,Ted (2011). 3,000 Deep-Sky Objects: An Annotated Catalogue. Springer Science & Business Media. p. 54. ISBN 9781441994196.
  6. Bogdan C. Ciambur; Alister W. Graham (2016), Quantifying the (X/peanut)-shaped structure in edge-on disc galaxies: length, strength, and nested peanuts
  7. 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.




На других языках

[de] NGC 128

NGC 128 ist eine Linsenförmige Galaxie vom Hubble-Typ S0 im Sternbild Fische auf der Ekliptik. Sie ist schätzungsweise 194 Millionen Lichtjahre von der Milchstraße entfernt und hat einem Durchmesser von etwa 140.000 Lichtjahren. Die Galaxie hat ein ungewöhnliches erdnußförmiges Halo, vermutlich durch Gravitationseffekte seiner Begleiter verursacht.
- [en] NGC 128

[es] NGC 128

NGC 128 es una galaxia lenticular localizada en la constelación de Piscis. Está aproximadamente a 190 millones de años luz de la Tierra y tiene un diámetro de aproximadamente 165.000 años luz.

[ru] NGC 128

NGC 128 — линзовидная галактика в созвездии Рыб. Находится в 190 млн световых лет от Солнца. Имеет диаметр около 165 000 световых лет[4].


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