NGC 474
Galaxy NGC 474 |
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NGC 474 (top left) and NGC 470 , imaged with the Very Large Telescope | |
AladinLite | |
Constellation | fishes |
Position equinox : J2000.0 , epoch : J2000.0 |
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Right ascension | 01 h 20 m 06.7 s |
declination | + 03 ° 24 ′ 55 ″ |
Appearance | |
Morphological type | (R ') SA (s) 0 ^ 0 ^ |
Brightness (visual) | 11.3 mag |
Brightness (B-band) | 12.3 mag |
Angular expansion | 7.1 ′ × 6.3 ′ |
Position angle | 75 ° |
Surface brightness | 15.3 mag / arcmin² |
Physical data | |
Affiliation |
NGC 470 group NGC 488 group LGG 20 |
Redshift | 0.007755 ± 0.000023 |
Radial velocity | (2325 ± 7) km / s |
Stroke distance v rad / H 0 |
(107 ± 8) · 10 6 ly (32.7 ± 2.3) Mpc |
history | |
discovery | Wilhelm Herschel |
Discovery date | December 13, 1784 |
Catalog names | |
NGC 474 • UGC 864 • PGC 4801 • CGCG 385-071 • MCG + 00-04-085 • 2MASX J01200669 + 0324549 • Arp 227 • GC 269 • H III-251 • 2MASS J01200667 + 0324558 • LDCE 85 NED002 • KTG 5C |
NGC 474 is a post-merger galaxy and shell galaxy on the southern edge of the constellation Pisces, on the border with the whale. Together with NGC 470 , it forms a loose pair of galaxies. It is likely that interactions between these two galaxies caused the unusually complex structure of NGC 474. The galaxy is the central object of the galaxy group Arp 227 .
Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class galaxies with concentric rings .
The object was discovered on December 13, 1784 by the German-British astronomer William Herschel .
literature
- Jeff Kanipe and Dennis Webb: The Arp Atlas of Peculiar Galaxies - A Chronicle and Observer's Guide , Richmond 2006, ISBN 978-0-943396-76-7
Web links
Commons : NGC 474 - collection of images, videos, and audio files
- SIMBAD Astronomical Database
- Arp Atlas of Peculiar Galaxies
- Seligman Arp
- Spektrum.de : Amateur recordings [1] [2] [3]