NGC 2397
Galaxy NGC 2397 |
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Photo from the Hubble Space Telescope | |
AladinLite | |
Constellation | Flying fish |
Position equinox : J2000.0 , epoch : J2000.0 |
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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
Individual evidence
- ↑ a b c d e f NASA / IPAC EXTRAGALACTIC DATABASE
- ↑ a b c d e SEDS : NGC 2397
- ^ VizieR
- ↑ Exploding star in nearby galaxy . European Space Agency. April 1, 2008. Retrieved November 29, 2011.
- ↑ Ian O'Neill: Supernova Precursor Discovered in Spiral Galaxy NGC 2397 . Universe Today. April 5, 2008. Retrieved December 1, 2011.
- ↑ Simbad
- ↑ Seligman