| NGC 4567 and NGC 4568 | |
|---|---|
 The Siamese Twins with NGC 4567 (top) and NGC 4568 (bottom) |
|
| Observation data (J2000.0 epoch) | |
| Constellation | Virgo |
| Right ascension | 12h 36m 34.3s |
| Declination | +11° 14′ 17″ |
| Distance | 59.4 Mly (18.2 Mpc)[1] |
| Type | SA(rs)bc / SA(rs)bc |
| Apparent dimensions (V) | 4.6' × 2.1' |
| Apparent magnitude (V) | +10.9 |
| Absolute magnitude (V) | -13.3 |
| Notable features | colliding galaxies |
| Other designations | |
| NGC 4567/8, UGC 7776 | |
| See also: Galaxy, List of galaxies | |
NGC 4567 and NGC 4568 (nicknamed the Siamese Twins or the Butterfly Galaxies) are a set of spiral galaxies about 60 million light-years away[1] in the constellation Virgo. They were both discovered by William Herschel in 1784. They are part of the Virgo cluster of galaxies. Only one supernova (SN 2004cc) was observed in the Siamese Twins.
These galaxies may be in the process of colliding and merging with each other. They were named "Siamese Twins" because they look like they're connected.
See also [link]
References [link]
- ^ a b "Distance Results for NGC 4568". NASA/IPAC Extragalactic Database. https://nedwww.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+4568. Retrieved 2010-05-01.
External links [link]
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https://wn.com/NGC_4567_and_NGC_4568
Systematic name
A systematic name is a name given in a systematic way to one unique group, organism, object or chemical substance, out of a specific population or collection. Systematic names are usually part of a nomenclature.
A semisystematic name or semitrivial name is a name that has at least one systematic part and at least one trivial part.
Creating systematic names can be as simple as assigning a prefix or a number to each object (in which case they are a type of numbering scheme), or as complex as encoding the complete structure of the object in the name. Many systems combine some information about the named object with an extra sequence number to make it into a unique identifier.
Systematic names often co-exist with earlier common names assigned before the creation of any systematic naming system. For example, many common chemicals are still referred to by their common or trivial names, even by chemists.
In chemistry
In chemistry, a systematic name describes the chemical structure of a substance, thus giving some information about its chemical properties.
