IC 342
Galaxy data from IC 342 |
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AladinLite | |
Constellation | giraffe |
Position equinox : J2000.0 , epoch : J2000.0 |
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Right ascension | 03 h 46 m 48.5 s |
declination | + 68 ° 05 ′ 47 ″ |
Appearance | |
Morphological type | SAB (rs) cd / Sy2 / HII |
Brightness (visual) | 8.4 mag |
Brightness (B-band) | 9.1 mag |
Angular expansion | 21.4 ′ × 20.9 ′ |
Position angle | 168 ° |
Surface brightness | 14.9 mag / arcmin² |
Physical data | |
Affiliation |
IC 342 / Maffei group , Virgo supercluster , LGG 104 |
Redshift | 0.000103 ± 0.000010 |
Radial velocity | 31 ± 3 km / s |
Stroke distance v rad / H 0 |
(8 ± 1) x 10 6 ly (2.43 ± 0.19) Mpc |
history | |
discovery | William Frederick Denning |
Discovery date | August 19, 1892 |
Catalog names | |
IC 342 • UGC 2847 • PGC 13826 • CGCG 305-002 • MCG + 11-05-003 • IRAS 03419 + 6756 • 2MASX J03464851 + 6805459 • |
IC 342 is a bar - spiral galaxy with an active galaxy core of the Hubble-type SAB (rs) cd in the constellation Giraffe in the northern sky . It is around 8 million light years away from the Milky Way , has a diameter of around 60,000 light years, and is classified as a Seyfert-2 galaxy .
The galaxy is located near the galactic equator , where veils of dust make it difficult for amateur and professional astronomers to observe the object. IC 342 is one of the brightest galaxies in the Maffei - group of galaxies , the galaxies group of the Local Group is closest.
In the center of IC 342, clouds of hot (412 Kelvin) ammonia gas were detected using the Very Large Array . Silicon monoxide was also discovered in the galaxy .
The galaxy was discovered on October 14, 1892 by William Frederick Denning . Edwin Hubble initially assumed she was part of the Local Group, which later turned out to be wrong.
The "IC" in the name stands for the index catalog , an astronomical catalog of galactic nebulae, star clusters and galaxies published at the end of the 19th / beginning of the 20th century.
Illustrations
High-resolution photography of the central area using the Hubble Space Telescope
Image of the central H-II region in ultraviolet and visible light using the Hubble space telescope
Infrared image using the Spitzer Space Telescope
Web links
- IC 342 (with picture) at NOAO.edu
- The hidden galaxy IC 342 - Astronomy Picture of the Day of December 22, 2010.
- IC 342
- astronews.com: Picture of the day July 4th, 2017
- Spektrum.de : Amateur recordings [1] [2] [3] [4]
Individual evidence
- ↑ a b c d NASA / IPAC EXTRAGALACTIC DATABASE
- ↑ a b c d e f SEDS : IC 342
- ↑ Seligman
- ^ Hot Molecular Gas in the Nuclear Region of IC 342, bibcode : 2006ApJ ... 646..919M
- ↑ The SiO interferometer map of IC 342, bibcode : 2006A & A ... 448..457U
- ↑ 1893AstAp..12..189D - Astron. and Astro-Phys., 12, 189-189 (1893) , simbad.harvard.edu
- ↑ SEDS IC 342 .