IC 1613
| IC 1613 | |
|---|---|
|
|
| Observation data (J2000 epoch) | |
| Constellation | Cetus |
| Right ascension | 01h 04m 47.8s[2] |
| Declination | +02° 07′ 04″[2] |
| Redshift | -234 ± 1 km/s[2] |
| Distance | 2.38 ± 0.07 Mly (730 ± 20 kpc)[3][4] |
| Type | IB(s)m[2] |
| Apparent dimensions (V) | 16′.2 × 14′.5[2] |
| Apparent magnitude (V) | 9.9[2] |
| Notable features | - |
| Other designations | |
| UGC 668,[2] DDO 8,[2] PGC 3844,[2] Caldwell 51 | |
IC 1613 (also known as Caldwell 51) is an irregular dwarf galaxy in the constellation Cetus near the star 26 Ceti.[5] It was discovered in 1906 by Max Wolf,[5] and is approaching Earth at 234 km/s.
IC 1613 is a member of the Local Group.[5] It has played an important role in the calibration of the Cepheid variable period luminosity relation for estimating distances.[5] Other than the Magellanic Clouds, it is the only Local Group dwarf irregular galaxy where RR Lyrae-type variables have been observed; this factor, along with an unusually low abundance of interstellar dust both within IC 1613 and along the line of sight enable especially accurate distance estimates.,[5][6]
In 1999, Cole et al.[5] used the Hubble Space Telescope to find that the dominant population of this galaxy has an age of ~7 Gyr. Using its Hess diagram, they found that its evolutionary history may be similar to that of the Pegasus Dwarf Irregular Galaxy. Both galaxies are classified as Ir V in the DDO system. Also in 1999, Antonello et al. found five cepheids of Population II in IC 1613, giving self-evident support for the existence of a very old stellar population component of IC 1613. In 1999, King, Modjaz, & Li discovered the first nova ever detected in IC 1613.[7]
IC 1613 contains a WO star known as DR1, the only one so far detected further away than the Magellanic Clouds.[8]
Galery
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Amateur photography of IC 1613
References
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- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ https://www.eso.org/public/news/eso1603/
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
- IC 1613 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Coordinates: 
01h 04m 47.8s, +02° 07′ 04″
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