IC 342
| IC 342 | |
|---|---|
 |
|
| Observation data (J2000 epoch) | |
| Constellation | Camelopardalis |
| Right ascension | 03h 46m 48.5s[1] |
| Declination | +68° 05′ 46″[1] |
| Redshift | 31 ± 3 km/s[1] |
| Distance | 10.7 ± 0.9 Mly (3.3 ± 0.3 Mpc)[2][3] |
| Type | SAB(rs)cd[1] |
| Apparent dimensions (V) | 21′.4 × 20′.9[1] |
| Apparent magnitude (V) | 9.1[1] |
| Other designations | |
| UGC 2847, PGC 13826,[1] Caldwell 5 | |
| See also: Galaxy, List of galaxies | |
IC 342 (also known as Caldwell 5) is an intermediate spiral galaxy in the constellation Camelopardalis. The galaxy, located about 7 million light years away is near the galactic equator where dust obscuration makes it a difficult object for both amateur and professional astronomers to observe.[1]
IC 342 is one of the brightest two galaxies in the IC 342/Maffei Group of galaxies, one of the galaxy groups that is closest to the Local Group. The galaxy was discovered by William Frederick Denning in 1895. Edwin Hubble first thought it to be in the Local Group, but later it was demonstrated that the galaxy is outside the Local Group.[4]
In 1935, Harlow Shapely declared that this galaxy was the third largest galaxy by angular size then known, smaller only than the Andromeda Galaxy (M31) and the Triangulum Galaxy (M33), being wider that the full moon.[5] This does not take into account the visual size of the LMC or SMC.
It has a H II nucleus.[6]
[edit] References
- ^ a b c d e f g h "NASA/IPAC Extragalactic Database". Results for IC 342. http://nedwww.ipac.caltech.edu/. Retrieved 2006-11-01.
- ^ 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.
- ^ SEDS IC 342.
- ^ Border Cities Star (Windsor, Ontario), "Spiral Galaxy Third Biggest", 24 June 1935, p.8
- ^ Ho, Luis C.; Filippenko, Alexei V.; Sargent, Wallace L. W. (October 1997). "A Search for 'Dwarf' Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies". Astrophysical Journal Supplement 112: pp. 315. doi:10.1086/313041. http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1997ApJS..112..315H
[edit] External links
- NASA Astronomy Picture of the Day – 22 December 2010
- IC 342 (image included) at NOAO.edu
- IC 342 The hidden Galaxy
- IC 342 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Coordinates: 
03h 46m 48.5s, +68° 05′ 46″
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