NGC 2442
| Galaxy NGC 2442 / NGC 2443 |
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|---|---|
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| NGC 2442 ESO : captured by the 1.5 m telescope at the La Silla Observatory | |
| AladinLite | |
| Constellation | Flying fish |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 07 h 36 m 23.8 s |
| declination | -69 ° 31 ′ 51 ″ |
| Appearance | |
| Morphological type | SAB (s) bc / pec / LINER |
| Brightness (visual) | 10.4 mag |
| Brightness (B-band) | 11.2 mag |
| Angular expansion | 6 ′ × 5 ′ |
| Position angle | 27 ° |
| Surface brightness | 13.9 mag / arcmin² |
| Physical data | |
| Affiliation | NGC 2442 group LGG 147 |
| Redshift | 0.004890 ± 0.000018 |
| Radial velocity | 1466 ± 5 km / s |
|
Stroke distance v rad / H 0 |
(56 ± 4) · 10 6 ly (17.2 ± 1.2) Mpc |
| history | |
| discovery | John Herschel |
| Discovery date | December 8, 1834 |
| Catalog names | |
| NGC 2442 • NGC 2443 • PGC 21373 • ESO 059-008 • IRAS 07367-6924 • 2MASX J07362384-6931509 • SGC 073633-6925.0 • GC 1568 • h 3097 • AM 0736-692 • HIPASS J0736-69 • LDCE 0515 NED004 | |
NGC 2442 = NGC 2443 (also meat hook galaxy ) is a bar-spiral galaxy with an active galaxy core of the Hubble-type SBbc in the constellation Flying Fish in the southern sky . It is estimated to be 56 million light years from the Milky Way and about 120,000 light years in diameter.
Everywhere in the galaxy and especially in the longer of the two spiral arms there are purple and reddish nebula regions. These are clouds of hydrogen gas . The intense radiation emitted by the young stars stimulates the gas from which they were once formed to glow red. The trigger for the star formation in NGC 2442 was probably the interaction with another galaxy. The turbulence that was caused by this resulted in a compression of the gas in some areas and thus triggered the collapse of the cloud and thus the starburst. The distorted shape is very likely the result of this encounter. A candidate for this would be the galaxy PGC 21457, some 2 million light years further away .
Together with three other galaxies, it forms the NGC 2442 group or LGG 147 .
The supernovae SN 1999ga (Type IIL), SN 2015F ( Type Ia ) and SN 2016jbu (Type IIn) were observed here.
The object was discovered on December 8, 1834 by the British astronomer John Herschel .
NGC 2442 group ( LGG 147 )
| Galaxy | Alternative name | Distance / million Lj |
|---|---|---|
| NGC 2397 | PGC 20766 | 52 |
| NGC 2434 | PGC 21325 | 53 |
| NGC 2442 | PGC 21373 | 56 |
| PGC 20690 | AM 0720-723 | 58 |
Web links
- SIMBAD Astronomical Database
- Antilhue - Chile
- Evolution of spiral galaxies
- Astrophysics
- ESO : Two Views of a Listed Galaxy (+ Photos, Map & Animation) May 4th 2011
- astronews.com: Two glimpses of a galaxy May 4, 2011
- astronews.com: Picture of the day June 14, 2013