Messier 77

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Galaxy
Messier 77
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Image taken with a 60 cm telescope
Image taken with a 60 cm telescope
AladinLite
Constellation whale
Position
equinox :  J2000.0 , epoch : J2000.0
Right ascension 02 h 42 m 40.7 s
declination -00 ° 00 ′ 48 ″
Appearance
Morphological type (R) SA (rs) b; Sy1 Sy2  
Brightness  (visual) 8.9 likes
Brightness  (B-band) 9.7 likes
Angular expansion 7.1 '× 6.0'
Position angle 70 °
Surface brightness 12.8 mag / arcmin²
Physical data
Affiliation LGG 073  
Redshift (3793 ± 10)  ·  10 −6  
Radial velocity (1137 ± 3) km / s  
Stroke distance
v rad  / H 0 		(51 ± 4)  ·  10 6  ly
(15.7 ± 1.1)  Mpc 
history
discovery Pierre Méchain
Discovery date October 29, 1780
Catalog names
M  77 • NGC  1068 • UGC  2188 • PGC  10266 • CGCG  388-098 • MCG  + 00-07-083 • IRAS  02401-0013 • KUG  0240-002 • Arp  37 • GC  600 • h  262 •

Messier 77 (also known as NGC 1068) is an 8.9  mag bright spiral galaxy with an area of ​​7.1 '× 6.0' in the constellation Whale . This Hubble-type Sb galaxy is known as a radio galaxy, also known as Cetus A , and has an active galaxy core at its center. They are about 60 million light years apart , so M77 is actually one of the largest spiral galaxies in the Messier catalog. The object is a close neighbor of NGC 1087 .
Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class spiral galaxies with a companion of low surface brightness on one arm (Arp catalog) .

The galaxy Messier 77 was discovered by the French astronomer Pierre Méchain on October 29, 1780 .

Web links

Commons : Messier 77  - collection of images, videos and audio files

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

Individual evidence

  1. ↑ a b c d e NASA / IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c d e SEDS : NGC 1068
  3. ↑ SuW 10.2017 p. 64
  4. ↑ Seligman