- IC 1613
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IC 1613 Observation data (J2000 epoch) Constellation Cetus Right ascension 01h 04m 47.8s[1] Declination +02° 07′ 04″[1] Redshift -234 ± 1 km/s[1] Distance 2.38 ± 0.07 Mly (730 ± 20 kpc)[2][3] Type IB(s)m[1] Apparent dimensions (V) 16′.2 × 14′.5[1] Apparent magnitude (V) 9.9[1] Notable features - Other designations UGC 668,[1] DDO 8,[1] PGC 3844,[1] Caldwell 51 See also: Galaxy, List of galaxies IC 1613 (also known as Caldwell 51) is an irregular dwarf galaxy in the constellation Cetus near the star 26 Ceti.[4] It was discovered in 1906 by Max Wolf,[4] and is approaching Earth at 234 km/s.
IC 1613 is a member of our Local Group.[4] It has played an important role in the calibration of the Cepheid variable period luminosity relation for estimating distances.[4] Other than the Magellanic Clouds, it is the only Local Group dwarf irregular galaxy where RR Lyrae-type variables have been observed.[4]
In 1999, Cole et al.[4] 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.[5]
References
- ^ a b c d e f g h i "NASA/IPAC Extragalactic Database". Results for IC 1613. http://nedwww.ipac.caltech.edu/. Retrieved 2006-11-29.
- ^ I. D. Karachentsev, V. E. Karachentseva, W. K. Hutchmeier, D. I. Makarov (2004). "A Catalog of Neighboring Galaxies". Astronomical Journal 127 (4): 2031–2068. Bibcode 2004AJ....127.2031K. doi:10.1086/382905.
- ^ Karachentsev, I. D.; Kashibadze, O. G. (2006). "Masses of the local group and of the M81 group estimated from distortions in the local velocity field". Astrophysics 49 (1): 3–18. Bibcode 2006Ap.....49....3K. doi:10.1007/s10511-006-0002-6.
- ^ a b c d e f Cole, Andrew A.; Tolstoy, Eline; Gallagher, John S., III; Hoessel, John G.; Mould, Jeremy R.; Holtzman, Jon A.; Saha, Abhijit; Ballester, Gilda E.; Burrows, Christopher J.; Clarke, John T.; Crisp, David; Griffiths, Richard E.; Grillmair, Carl J.; Hester, Jeff J.; Krist, John E.; Meadows, Vikki; Scowen, Paul A.; Stapelfeldt, Karl R.; Trauger, John T.; Watson, Alan M.; Westphal, James R. (1999). "Stellar Populations at the Center of IC 1613". The Astronomical Journal 118 (4): 1657–1670. arXiv:astro-ph/9905350. Bibcode 1999AJ....118.1657C. doi:10.1086/301042.
- ^ van den Bergh, Sidney (April 2000). "Updated Information on the Local Group". The Publications of the Astronomical Society of the Pacific 112 (770): 529–536. arXiv:astro-ph/0001040. Bibcode 2000PASP..112..529V. doi:10.1086/316548
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″
The Caldwell catalogue List C1 · C2 · C3 · C4 · C5 · C6 · C7 · C8 · C9 · C10 · C11 · C12 · C13 · C14 · C15 · C16 · C17 · C18 · C19 · C20 · C21 · C22 · C23 · C24 · C25 · C26 · C27 · C28 · C29 · C30 · C31 · C32 · C33 · C34 · C35 · C36 · C37 · C38 · C39 · C40 · C41 · C42 · C43 · C44 · C45 · C46 · C47 · C48 · C49 · C50 · C51 · C52 · C53 · C54 · C55 · C56 · C57 · C58 · C59 · C60 · C61 · C62 · C63 · C64 · C65 · C66 · C67 · C68 · C69 · C70 · C71 · C72 · C73 · C74 · C75 · C76 · C77 · C78 · C79 · C80 · C81 · C82 · C83 · C84 · C85 · C86 · C87 · C88 · C89 · C90 · C91 · C92 · C93 · C94 · C95 · C96 · C97 · C98 · C99 · C100 · C101 · C102 · C103 · C104 · C105 · C106 · C107 · C108 · C109See also Categories:- Dwarf irregular galaxies
- Local Group
- Cetus constellation
- IC objects
- UGC objects
- PGC objects
- Caldwell objects
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