NGC 128
| NGC 128 | |
|---|---|
| File:NGC 128 Mount Lemmon Sky Center.jpg | |
| Observation data (J2000 epoch) | |
| Constellation | Pisces |
| Right ascension | 00h 29m 15.047s[1] |
| Declination | +02° 51′ 50.60″[1] |
| Redshift | 0.01466[1] |
| Heliocentric 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
[edit | edit source]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
[edit | edit source]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
[edit | edit source]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
[edit | edit source]-
NGC 128 group with labels
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NGC 128 group without labels
See also
[edit | edit source]References
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- ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Bogdan C. Ciambur; Alister W. Graham (2016), Quantifying the (X/peanut)-shaped structure in edge-on disc galaxies: length, strength, and nested peanuts
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
External links
[edit | edit source]- Error creating thumbnail: File missing Media related to Lua error in Module:Commons_link at line 62: attempt to index field 'wikibase' (a nil value). at Wikimedia Commons
