NGC 474

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Galaxy
NGC 474
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NGC 474 (top left) and NGC 470, imaged with the Very Large Telescope
NGC 474 (top left) and NGC 470 , imaged with the Very Large Telescope
AladinLite
Constellation fishes
Position
equinox :  J2000.0 , epoch : J2000.0
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

Individual evidence

  1. ↑ a b c d e NASA / IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c d e f SEDS : NGC 474
  3. ^ VizieR
  4. Jump up ↑ Galaxy NGC 474: Cosmic Mixer - Astronomy Picture of the Day of October 8, 2007.
  5. ↑ Seligman