Messier 83
| Galaxy Messier 83 |
|
|---|---|
|
|
| ESO : Image taken with the Very Large Telescope | |
| AladinLite | |
| Constellation | Water snake |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 13 h 37 m 00.9 s |
| declination | −29 ° 51 ′ 56 ″ |
| Appearance | |
| Morphological type | SAB (s) c / HII / Sbrst |
| Brightness (visual) | 7.5 likes |
| Brightness (B-band) | 8.2 likes |
| Angular expansion | 12.9 ′ × 11.5 ′ |
| Position angle | 44 ° |
| Surface brightness | 12.8 mag / arcmin² |
| Physical data | |
| Affiliation | M83 group , LGG 355 |
| Redshift | +0.001711 ± 0.000007 |
| Radial velocity | +513 ± 2 km / s |
|
Stroke distance v rad / H 0 |
(17 ± 1) x 10 6 ly (5.23 ± 0.37) Mpc |
| history | |
| discovery | Nicolas Louis de Lacaille |
| Discovery date | 1751 |
| Catalog names | |
| M 83 • NGC 5236 • UGCA 366 • PGC 48082 • ESO 444-G81 • MCG -05-32-050 • IRAS 13341-2936 • 2MASX J13370091-2951567 • SGC 133411-2936.8 • GC 3606 • h 3523 • Dun 628 • HIPASS J1337-29 • 1RXS J133657.0-295207 | |
Messier 83 , sometimes called the Southern Pinwheel Galaxy , is a spiral galaxy in the constellation Water Snake on the border with Virgo . In the northern hemisphere, it can only be observed in the evening in the spring.
Although M83 is a quite bright galaxy with an apparent magnitude of 7.5 mag, it is difficult to observe from Central Europe, as it is only 10–15 ° above the horizon. Observed from southern latitudes, it is one of the brightest spiral galaxies in the night sky.
The galaxy is about 17 million light-years away and name-giving for the M83 group , one of the local group adjacent group of galaxies , which includes the bright galaxy Centaurus A contains.
The galaxy was discovered by Nicolas Louis de Lacaille in 1751 .
Appearance
M 83 already appears in the prism binoculars as a round, misty spot. The beam structure and spiral arms become visible in a larger telescope .
Detailed study of the Hubble Space Telescope
Panoramic image in the UV by GALEX (blue, green) and in the 21 cm band by the Very Large Array (red).
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Supernova SN 1968L
On July 16, 1968, while searching for comets , the South African amateur astronomer John Caister Bennett accidentally discovered an unusual appearance in the center of the galaxy M83. Shortly afterwards, this was recognized as a supernova by professional astronomers . It was the first visual discovery of a supernova since the invention of the telescope.
Web links
- ESO: New Views of a Well-Known Spiral Galaxy + Photos & Animations - May 19, 2010
- GALEX
- astronews.com: Picture of the day November 16, 2012
Individual evidence
- ↑ a b c d NASA / IPAC EXTRAGALACTIC DATABASE
- ↑ a b c d e SEDS : NGC 5236
- ↑ Seligman
- ↑ SN 1968L - SuperNova. SIMBAD, accessed on September 6, 2016 .
- ^ JA da S. Campos: Obituary John Caister Bennett (1914-1990). ; B. Marsden: Jack Bennett - An Appreciation. In: Monthly Notes of the Astronomical Society of Southern Africa. Vol. 49, 1990, pp. 113-115 ( bibcode : 1990MNSSA..49..113C ).
