NGC 7640

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Galaxy
NGC 7640
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NGC 7640 [1] Hubble Space Telescope
NGC 7640 Hubble Space Telescope
AladinLite
Constellation Andromeda
Position
equinoxJ2000.0 , epoch : J2000.0
Right ascension 23 h 22 m 06.58 s
declination + 40 ° 50 ′ 43.5 ″
Appearance
Morphological type SB (s) c / HII  
Brightness  (visual) 11.1 mag
Brightness  (B-band) 11.8 mag
Angular expansion 10.5 ′ × 1.8 ′
Position angle 167 °
Surface brightness 14.1 mag / arcmin²
Physical data
Redshift 0.001231 ± 0.000004  
Radial velocity 369 ± 1 km / s  
Stroke distance
v rad  / H 0
(26 ± 2)  x  10 6  ly
(7.90 ± 0.56)  Mpc 
history
discovery Wilhelm Herschel
Discovery date October 17, 1786
Catalog names
NGC  7640 • UGC  12554 • PGC  71220 • CGCG  532-017 • CGCG 533-001 • MCG  + 07-48-002 • IRAS  23197 + 4034 • 2MASX  J23220658 + 4050435 • GC  4950 • H  II 600 • h  2236 • 2MASS J23220658 + 4050407 • NVSS J232205 + 405050 • KTG 80A

NGC 7640 is a bar-spiral galaxy with extensive star formation regions of the Hubble type SBc in the constellation Andromeda in the northern sky . Recent observations suggest that the increased star formation is due to absorption of matter after a collision with a smaller galaxy.

It is estimated to be 26 million light years away from the Milky Way and about 60,000 light years in diameter . Together with PGC 71368 and PGC 71596 it forms the isolated galaxy trio KTG 80 .

The object was discovered on October 17, 1786 by the German-British astronomer Wilhelm Herschel using his 18.7-inch mirror telescope.

WebLinks

Individual evidence

  1. ^ Aladin Lite
  2. a b c d NASA / IPAC EXTRAGALACTIC DATABASE
  3. a b c d e SEDS : NGC 7640
  4. Seligman