Astronomy:NGC 128
| NGC 128 | |
|---|---|
 | |
| Observation data (J2000 epoch) | |
| Constellation | Pisces |
| Right ascension | 00h 29m 15.047s[1] |
| Declination | +02° 51′ 50.60″[1] |
| Redshift | 0.01466[1] |
| Helio radial velocity | 4363 km/s[1] |
| Distance | 190 Mly (58 Mpc)[2] |
| Apparent magnitude (V) | 11.63[3] |
| Apparent magnitude (B) | 12.65[3] |
| Characteristics | |
| Type | S0[1] |
| Other designations | |
| UGC 292, MCG+00-02-051, PGC 1791[1] | |
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]
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]
Gallery
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NGC 128 group with labels -
NGC 128 group without labels
See also
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "NGC 128". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+128.
- ↑ 2.0 2.1 2.2 2.3 "New General Catalog Objects: NGC 100 - 149". Celestial Atlas. http://cseligman.com/text/atlas/ngc1.htm#128.
- ↑ 3.0 3.1 "Search specification: NGC 128". HyperLeda. Université Claude Bernard Lyon 1. http://leda.univ-lyon1.fr/ledacat.cgi?o=NGC%20128. Retrieved 2021-02-12.
- ↑ "NGC 128". http://www.ngcicproject.org/pubdb.htm.
- ↑ Aranda,Ted (2011). 3,000 Deep-Sky Objects: An Annotated Catalogue. Springer Science & Business Media. pp. 54. ISBN 9781441994196.
- ↑ Bogdan C. Ciambur; Alister W. Graham (2016), Quantifying the (X/peanut)-shaped structure in edge-on disc galaxies: length, strength, and nested peanuts
- ↑ 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.
External links
Coordinates: 
00h 29m 15.0s, +02° 51′ 51″
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