NGC 2397

from Wikipedia, the free encyclopedia
Galaxy
NGC 2397
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Photo from the Hubble Space Telescope
Photo from the Hubble Space Telescope
AladinLite
Constellation Flying fish
Position
equinox :  J2000.0 , epoch : J2000.0
Right ascension 07 h 21 m 20.0 s
declination -69 ° 00 ′ 05 ″
Appearance
Morphological type SAB (rs) b  
Brightness  (visual) 11.9 likes
Brightness  (B-band) 12.7 mag
Angular expansion 2.5 ′ × 1.2 ′
Position angle 123 °
Surface brightness 12.9 mag / arcmin²
Physical data
Affiliation NGC 2442 group
LGG 147  
Redshift 0.004546 ± 0.000033  
Radial velocity 1363 ± 10 km / s  
Stroke distance
v rad  / H 0 		(52 ± 4)  ·  10 6  ly
(15.8 ± 1.1)  Mpc 
history
discovery John Herschel
Discovery date February 18, 1835
Catalog names
NGC  2397 • PGC  20766 • ESO  58-30 • IRAS  07214-6854 • 2MASX  J07211999-6900054 • SGC  072130-6854.3 • GC  1536 • h  3085 • AM 0721-685 • HIPASS  J0721-68 • LDCE 515 NED001

NGC 2397 is a spiral galaxy of Hubble type Sb in the constellation Volans at the southern sky . It is estimated to be 52 million light-years from the Milky Way and about 40,000 light-years across. Their core consists of older yellow and red stars; younger stars have formed in the blue outer spiral arms, in which clouds of dust can also be seen.
Together with NGC 2442 , NGC 2434 and PGC 20690 , it forms the NGC 2442 group .

In March 2006, the type IIP supernova SN 2006bc was observed in its late stage. Astronomers at Queen's University Belfast , who study supernovae with regard to their predecessor stars, found an earlier image of the galaxy on which the supernova was still in the phase of increasing brightness and thus in a very young stage.

The object was discovered on February 18, 1835 by the astronomer John Herschel .

Web links

Commons : NGC 2397  - collection of images, videos, and audio files

Individual evidence

  1. ↑ a b c d e f NASA / IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c d e SEDS : NGC 2397
  3. ^ VizieR
  4. ↑ Exploding star in nearby galaxy . European Space Agency. April 1, 2008. Retrieved November 29, 2011.
  5. ↑ Ian O'Neill: Supernova Precursor Discovered in Spiral Galaxy NGC 2397 . Universe Today. April 5, 2008. Retrieved December 1, 2011.
  6. ↑ Simbad
  7. ↑ Seligman